From patchwork Thu Nov 12 16:36:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399094 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6md2sdfz9sSf for ; Fri, 13 Nov 2020 03:41:05 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728359AbgKLQlA (ORCPT ); Thu, 12 Nov 2020 11:41:00 -0500 Received: from mx2.suse.de ([195.135.220.15]:44752 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728263AbgKLQlA (ORCPT ); Thu, 12 Nov 2020 11:41:00 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id B4473AB95; Thu, 12 Nov 2020 16:40:57 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org, Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Nicolas Saenz Julienne Cc: linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com Subject: [PATCH v4 01/11] firmware: raspberrypi: Keep count of all consumers Date: Thu, 12 Nov 2020 17:36:19 +0100 Message-Id: <20201112163630.17177-2-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org When unbinding the firmware device we need to make sure it has no consumers left. Otherwise we'd leave them with a firmware handle pointing at freed memory. Keep a reference count of all consumers and introduce rpi_firmware_put() which will permit automatically decrease the reference count upon unbinding consumer drivers. Suggested-by: Uwe Kleine-König Signed-off-by: Nicolas Saenz Julienne --- Changes since v3: - Use kref instead of waiting on refcount drivers/firmware/raspberrypi.c | 37 +++++++++++++++++++--- include/soc/bcm2835/raspberrypi-firmware.h | 2 ++ 2 files changed, 35 insertions(+), 4 deletions(-) diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c index 2371d08bdd17..438e17074a97 100644 --- a/drivers/firmware/raspberrypi.c +++ b/drivers/firmware/raspberrypi.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -27,6 +28,8 @@ struct rpi_firmware { struct mbox_chan *chan; /* The property channel. */ struct completion c; u32 enabled; + + struct kref consumers; }; static DEFINE_MUTEX(transaction_lock); @@ -225,12 +228,27 @@ static void rpi_register_clk_driver(struct device *dev) -1, NULL, 0); } +static void rpi_firmware_delete(struct kref *kref) +{ + struct rpi_firmware *fw = container_of(kref, struct rpi_firmware, + consumers); + + mbox_free_channel(fw->chan); + kfree(fw); +} + +void rpi_firmware_put(struct rpi_firmware *fw) +{ + kref_put(&fw->consumers, rpi_firmware_delete); +} +EXPORT_SYMBOL_GPL(rpi_firmware_put); + static int rpi_firmware_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rpi_firmware *fw; - fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL); + fw = kzalloc(sizeof(*fw), GFP_KERNEL); if (!fw) return -ENOMEM; @@ -247,6 +265,7 @@ static int rpi_firmware_probe(struct platform_device *pdev) } init_completion(&fw->c); + kref_init(&fw->consumers); platform_set_drvdata(pdev, fw); @@ -275,25 +294,35 @@ static int rpi_firmware_remove(struct platform_device *pdev) rpi_hwmon = NULL; platform_device_unregister(rpi_clk); rpi_clk = NULL; - mbox_free_channel(fw->chan); + + rpi_firmware_put(fw); return 0; } /** - * rpi_firmware_get - Get pointer to rpi_firmware structure. * @firmware_node: Pointer to the firmware Device Tree node. * + * The reference to rpi_firmware has to be released with rpi_firmware_put(). + * * Returns NULL is the firmware device is not ready. */ struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node) { struct platform_device *pdev = of_find_device_by_node(firmware_node); + struct rpi_firmware *fw; if (!pdev) return NULL; - return platform_get_drvdata(pdev); + fw = platform_get_drvdata(pdev); + if (!fw) + return NULL; + + if (!kref_get_unless_zero(&fw->consumers)) + return NULL; + + return fw; } EXPORT_SYMBOL_GPL(rpi_firmware_get); diff --git a/include/soc/bcm2835/raspberrypi-firmware.h b/include/soc/bcm2835/raspberrypi-firmware.h index cc9cdbc66403..fdfef7fe40df 100644 --- a/include/soc/bcm2835/raspberrypi-firmware.h +++ b/include/soc/bcm2835/raspberrypi-firmware.h @@ -140,6 +140,7 @@ int rpi_firmware_property(struct rpi_firmware *fw, u32 tag, void *data, size_t len); int rpi_firmware_property_list(struct rpi_firmware *fw, void *data, size_t tag_size); +void rpi_firmware_put(struct rpi_firmware *fw); struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node); #else static inline int rpi_firmware_property(struct rpi_firmware *fw, u32 tag, @@ -154,6 +155,7 @@ static inline int rpi_firmware_property_list(struct rpi_firmware *fw, return -ENOSYS; } +static inline void rpi_firmware_put(struct rpi_firmware *fw) { } static inline struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node) { return NULL; From patchwork Thu Nov 12 16:36:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399104 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6rM5qkTz9sT6 for ; Fri, 13 Nov 2020 03:44:19 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729147AbgKLQoQ (ORCPT ); Thu, 12 Nov 2020 11:44:16 -0500 Received: from mx2.suse.de ([195.135.220.15]:50088 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728643AbgKLQoJ (ORCPT ); Thu, 12 Nov 2020 11:44:09 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 1D06DAF26; Thu, 12 Nov 2020 16:44:06 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org, Nicolas Saenz Julienne , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com Cc: linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com Subject: [PATCH v4 02/11] firmware: raspberrypi: Introduce devm_rpi_firmware_get() Date: Thu, 12 Nov 2020 17:36:20 +0100 Message-Id: <20201112163630.17177-3-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Itroduce devm_rpi_firmware_get(), it'll simplify the firmware handling for most consumers. Suggested-by: Bartosz Golaszewski Signed-off-by: Nicolas Saenz Julienne --- Changes since v2: - Introduce devm_rpi_firmware_get() drivers/firmware/raspberrypi.c | 31 +++++++++++++++++++++- include/soc/bcm2835/raspberrypi-firmware.h | 8 ++++++ 2 files changed, 38 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c index 438e17074a97..4ab2dfdc82ad 100644 --- a/drivers/firmware/raspberrypi.c +++ b/drivers/firmware/raspberrypi.c @@ -237,10 +237,17 @@ static void rpi_firmware_delete(struct kref *kref) kfree(fw); } -void rpi_firmware_put(struct rpi_firmware *fw) +static void __rpi_firmware_put(void *data) { + struct rpi_firmware *fw = data; + kref_put(&fw->consumers, rpi_firmware_delete); } + +void rpi_firmware_put(struct rpi_firmware *fw) +{ + __rpi_firmware_put(fw); +} EXPORT_SYMBOL_GPL(rpi_firmware_put); static int rpi_firmware_probe(struct platform_device *pdev) @@ -326,6 +333,28 @@ struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node) } EXPORT_SYMBOL_GPL(rpi_firmware_get); +/** + * devm_rpi_firmware_get - Get pointer to rpi_firmware structure. + * @firmware_node: Pointer to the firmware Device Tree node. + * + * Returns NULL is the firmware device is not ready. + */ +struct rpi_firmware *devm_rpi_firmware_get(struct device *dev, + struct device_node *firmware_node) +{ + struct rpi_firmware *fw; + + fw = rpi_firmware_get(firmware_node); + if (!fw) + return NULL; + + if (devm_add_action_or_reset(dev, __rpi_firmware_put, fw)) + return NULL; + + return fw; +} +EXPORT_SYMBOL_GPL(devm_rpi_firmware_get); + static const struct of_device_id rpi_firmware_of_match[] = { { .compatible = "raspberrypi,bcm2835-firmware", }, {}, diff --git a/include/soc/bcm2835/raspberrypi-firmware.h b/include/soc/bcm2835/raspberrypi-firmware.h index fdfef7fe40df..73ad784fca96 100644 --- a/include/soc/bcm2835/raspberrypi-firmware.h +++ b/include/soc/bcm2835/raspberrypi-firmware.h @@ -142,6 +142,8 @@ int rpi_firmware_property_list(struct rpi_firmware *fw, void *data, size_t tag_size); void rpi_firmware_put(struct rpi_firmware *fw); struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node); +struct rpi_firmware *devm_rpi_firmware_get(struct device *dev, + struct device_node *firmware_node); #else static inline int rpi_firmware_property(struct rpi_firmware *fw, u32 tag, void *data, size_t len) @@ -160,6 +162,12 @@ static inline struct rpi_firmware *rpi_firmware_get(struct device_node *firmware { return NULL; } + +static inline struct rpi_firmware *devm_rpi_firmware_get(struct device *dev, + struct device_node *firmware_node) +{ + return NULL; +} #endif #endif /* __SOC_RASPBERRY_FIRMWARE_H__ */ From patchwork Thu Nov 12 16:36:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399096 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6pR69Xgz9sT6 for ; Fri, 13 Nov 2020 03:42:39 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728926AbgKLQmc (ORCPT ); Thu, 12 Nov 2020 11:42:32 -0500 Received: from mx2.suse.de ([195.135.220.15]:46154 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728426AbgKLQma (ORCPT ); Thu, 12 Nov 2020 11:42:30 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 5EB15AB95; Thu, 12 Nov 2020 16:42:28 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org Cc: f.fainelli@gmail.com, linux-pwm@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com, Nicolas Saenz Julienne , Michael Turquette Subject: [PATCH v4 03/11] clk: bcm: rpi: Release firmware handle on unbind Date: Thu, 12 Nov 2020 17:36:21 +0100 Message-Id: <20201112163630.17177-4-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Use devm_rpi_firmware_get() so as to make sure we release RPi's firmware interface when unbinding the device. Signed-off-by: Nicolas Saenz Julienne --- Changes since v2: - Use devm_rpi_firmware_get(), instead of remove function drivers/clk/bcm/clk-raspberrypi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-raspberrypi.c index f89b9cfc4309..dd3b71eafabf 100644 --- a/drivers/clk/bcm/clk-raspberrypi.c +++ b/drivers/clk/bcm/clk-raspberrypi.c @@ -314,7 +314,7 @@ static int raspberrypi_clk_probe(struct platform_device *pdev) return -ENOENT; } - firmware = rpi_firmware_get(firmware_node); + firmware = devm_rpi_firmware_get(&pdev->dev, firmware_node); of_node_put(firmware_node); if (!firmware) return -EPROBE_DEFER; From patchwork Thu Nov 12 16:36:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399107 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6rR08Stz9sVH for ; Fri, 13 Nov 2020 03:44:23 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729125AbgKLQoG (ORCPT ); Thu, 12 Nov 2020 11:44:06 -0500 Received: from mx2.suse.de ([195.135.220.15]:49678 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729090AbgKLQoF (ORCPT ); Thu, 12 Nov 2020 11:44:05 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 744C8AFD8; Thu, 12 Nov 2020 16:44:03 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org, Linus Walleij , Bartosz Golaszewski Cc: f.fainelli@gmail.com, linux-pwm@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, andy.shevchenko@gmail.com, Nicolas Saenz Julienne Subject: [PATCH v4 04/11] gpio: raspberrypi-exp: Release firmware handle on unbind Date: Thu, 12 Nov 2020 17:36:22 +0100 Message-Id: <20201112163630.17177-5-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Use devm_rpi_firmware_get() so as to make sure we release RPi's firmware interface when unbinding the device. Signed-off-by: Nicolas Saenz Julienne Acked-by: Bartosz Golaszewski --- Changes since v2: - Use devm_rpi_firmware_get(), instead of remove function drivers/gpio/gpio-raspberrypi-exp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpio/gpio-raspberrypi-exp.c b/drivers/gpio/gpio-raspberrypi-exp.c index bb100e0124e6..64a552ecc2ad 100644 --- a/drivers/gpio/gpio-raspberrypi-exp.c +++ b/drivers/gpio/gpio-raspberrypi-exp.c @@ -208,7 +208,7 @@ static int rpi_exp_gpio_probe(struct platform_device *pdev) return -ENOENT; } - fw = rpi_firmware_get(fw_node); + fw = devm_rpi_firmware_get(&pdev->dev, fw_node); of_node_put(fw_node); if (!fw) return -EPROBE_DEFER; From patchwork Thu Nov 12 16:36:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399100 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6r553MTz9sSf for ; Fri, 13 Nov 2020 03:44:05 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728907AbgKLQoA (ORCPT ); Thu, 12 Nov 2020 11:44:00 -0500 Received: from mx2.suse.de ([195.135.220.15]:49198 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727739AbgKLQoA (ORCPT ); Thu, 12 Nov 2020 11:44:00 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 9A345AB95; Thu, 12 Nov 2020 16:43:58 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org, Philipp Zabel Cc: f.fainelli@gmail.com, linux-pwm@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com, Nicolas Saenz Julienne Subject: [PATCH v4 05/11] reset: raspberrypi: Release firmware handle on unbind Date: Thu, 12 Nov 2020 17:36:23 +0100 Message-Id: <20201112163630.17177-6-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Use devm_rpi_firmware_get() so as to make sure we release RPi's firmware interface when unbinding the device. Signed-off-by: Nicolas Saenz Julienne --- Changes since v2: - Use devm_rpi_firmware_get(), instead of remove function drivers/reset/reset-raspberrypi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/reset/reset-raspberrypi.c b/drivers/reset/reset-raspberrypi.c index 02f59c06f69b..fa23db554bcf 100644 --- a/drivers/reset/reset-raspberrypi.c +++ b/drivers/reset/reset-raspberrypi.c @@ -82,7 +82,7 @@ static int rpi_reset_probe(struct platform_device *pdev) return -ENOENT; } - fw = rpi_firmware_get(np); + fw = devm_rpi_firmware_get(&pdev->dev, np); of_node_put(np); if (!fw) return -EPROBE_DEFER; From patchwork Thu Nov 12 16:36:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399098 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6qG6Hgxz9sRR for ; Fri, 13 Nov 2020 03:43:22 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728899AbgKLQnR (ORCPT ); Thu, 12 Nov 2020 11:43:17 -0500 Received: from mx2.suse.de ([195.135.220.15]:46660 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727739AbgKLQnR (ORCPT ); Thu, 12 Nov 2020 11:43:17 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id B625EAFCB; Thu, 12 Nov 2020 16:43:15 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org Cc: f.fainelli@gmail.com, linux-pwm@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com, Nicolas Saenz Julienne Subject: [PATCH v4 06/11] soc: bcm: raspberrypi-power: Release firmware handle on unbind Date: Thu, 12 Nov 2020 17:36:24 +0100 Message-Id: <20201112163630.17177-7-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Use devm_rpi_firmware_get() so as to make sure we release RPi's firmware interface when unbinding the device. Signed-off-by: Nicolas Saenz Julienne --- Changes since v2: - Use devm_rpi_firmware_get(), instead of remove function drivers/soc/bcm/raspberrypi-power.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/soc/bcm/raspberrypi-power.c b/drivers/soc/bcm/raspberrypi-power.c index 5d1aacdd84ef..068715d6e66d 100644 --- a/drivers/soc/bcm/raspberrypi-power.c +++ b/drivers/soc/bcm/raspberrypi-power.c @@ -177,7 +177,7 @@ static int rpi_power_probe(struct platform_device *pdev) return -ENODEV; } - rpi_domains->fw = rpi_firmware_get(fw_np); + rpi_domains->fw = devm_rpi_firmware_get(&pdev->dev, fw_np); of_node_put(fw_np); if (!rpi_domains->fw) return -EPROBE_DEFER; From patchwork Thu Nov 12 16:36:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399106 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6rQ47p8z9sTc for ; Fri, 13 Nov 2020 03:44:22 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729189AbgKLQoV (ORCPT ); Thu, 12 Nov 2020 11:44:21 -0500 Received: from mx2.suse.de ([195.135.220.15]:49880 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729107AbgKLQoG (ORCPT ); Thu, 12 Nov 2020 11:44:06 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 7FCB9B016; Thu, 12 Nov 2020 16:44:04 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org Cc: f.fainelli@gmail.com, linux-pwm@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com, Nicolas Saenz Julienne Subject: [PATCH v4 07/11] staging: vchiq: Release firmware handle on unbind Date: Thu, 12 Nov 2020 17:36:25 +0100 Message-Id: <20201112163630.17177-8-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Use devm_rpi_firmware_get() so as to make sure we release RPi's firmware interface when unbinding the device. Signed-off-by: Nicolas Saenz Julienne --- Changes since v2: - Use devm_rpi_firmware_get(), instead of remove function drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c index f500a7043805..6c196cade4a0 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c @@ -2732,7 +2732,7 @@ static int vchiq_probe(struct platform_device *pdev) return -ENOENT; } - drvdata->fw = rpi_firmware_get(fw_node); + drvdata->fw = devm_rpi_firmware_get(&pdev->dev, fw_node); of_node_put(fw_node); if (!drvdata->fw) return -EPROBE_DEFER; From patchwork Thu Nov 12 16:36:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399088 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6hq0BTfz9sSs for ; Fri, 13 Nov 2020 03:37:47 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729027AbgKLQhp (ORCPT ); Thu, 12 Nov 2020 11:37:45 -0500 Received: from mx2.suse.de ([195.135.220.15]:41794 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728685AbgKLQho (ORCPT ); Thu, 12 Nov 2020 11:37:44 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 99AF8AFC8; Thu, 12 Nov 2020 16:37:42 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org Cc: f.fainelli@gmail.com, linux-pwm@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com, Nicolas Saenz Julienne Subject: [PATCH v4 08/11] input: raspberrypi-ts: Release firmware handle when not needed Date: Thu, 12 Nov 2020 17:36:26 +0100 Message-Id: <20201112163630.17177-9-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Use devm_rpi_firmware_get() so as to make sure we release RPi's firmware interface when unbinding the device. Signed-off-by: Nicolas Saenz Julienne --- Changes since v3: - Release firmware handle in probe function Changes since v2: - Use devm_rpi_firmware_get(), instead of remove function drivers/input/touchscreen/raspberrypi-ts.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/input/touchscreen/raspberrypi-ts.c b/drivers/input/touchscreen/raspberrypi-ts.c index ef6aaed217cf..5000f5fd9ec3 100644 --- a/drivers/input/touchscreen/raspberrypi-ts.c +++ b/drivers/input/touchscreen/raspberrypi-ts.c @@ -160,7 +160,7 @@ static int rpi_ts_probe(struct platform_device *pdev) touchbuf = (u32)ts->fw_regs_phys; error = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF, &touchbuf, sizeof(touchbuf)); - + rpi_firmware_put(fw); if (error || touchbuf != 0) { dev_warn(dev, "Failed to set touchbuf, %d\n", error); return error; From patchwork Thu Nov 12 16:36:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399117 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6vm240tz9sRR for ; Fri, 13 Nov 2020 03:47:16 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729008AbgKLQrL (ORCPT ); Thu, 12 Nov 2020 11:47:11 -0500 Received: from mx2.suse.de ([195.135.220.15]:52330 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728487AbgKLQrL (ORCPT ); Thu, 12 Nov 2020 11:47:11 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id BD74CAEA3; Thu, 12 Nov 2020 16:47:08 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org, Nicolas Saenz Julienne , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Eric Anholt , Stefan Wahren Cc: linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com, Rob Herring , Rob Herring Subject: [PATCH v4 09/11] dt-bindings: pwm: Add binding for RPi firmware PWM bus Date: Thu, 12 Nov 2020 17:36:27 +0100 Message-Id: <20201112163630.17177-10-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The PWM bus controlling the fan in RPi's official PoE hat can only be controlled by the board's co-processor. Signed-off-by: Nicolas Saenz Julienne Reviewed-by: Rob Herring --- Changes since v3: - Fix example Changes since v1: - Update bindings to use 2 #pwm-cells .../arm/bcm/raspberrypi,bcm2835-firmware.yaml | 20 +++++++++++++++++++ .../pwm/raspberrypi,firmware-pwm.h | 13 ++++++++++++ 2 files changed, 33 insertions(+) create mode 100644 include/dt-bindings/pwm/raspberrypi,firmware-pwm.h diff --git a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml index a2c63c8b1d10..38be3ff69609 100644 --- a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml +++ b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml @@ -64,6 +64,21 @@ properties: - compatible - "#reset-cells" + pwm: + type: object + + properties: + compatible: + const: raspberrypi,firmware-pwm + + "#pwm-cells": + # See pwm.yaml in this directory for a description of the cells format. + const: 2 + + required: + - compatible + - "#pwm-cells" + additionalProperties: false required: @@ -87,5 +102,10 @@ examples: compatible = "raspberrypi,firmware-reset"; #reset-cells = <1>; }; + + pwm: pwm { + compatible = "raspberrypi,firmware-pwm"; + #pwm-cells = <2>; + }; }; ... diff --git a/include/dt-bindings/pwm/raspberrypi,firmware-pwm.h b/include/dt-bindings/pwm/raspberrypi,firmware-pwm.h new file mode 100644 index 000000000000..27c5ce68847b --- /dev/null +++ b/include/dt-bindings/pwm/raspberrypi,firmware-pwm.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2020 Nicolas Saenz Julienne + * Author: Nicolas Saenz Julienne + */ + +#ifndef _DT_BINDINGS_RASPBERRYPI_FIRMWARE_PWM_H +#define _DT_BINDINGS_RASPBERRYPI_FIRMWARE_PWM_H + +#define RASPBERRYPI_FIRMWARE_PWM_POE 0 +#define RASPBERRYPI_FIRMWARE_PWM_NUM 1 + +#endif From patchwork Thu Nov 12 16:36:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399102 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6rK0ZM5z9sSs for ; Fri, 13 Nov 2020 03:44:17 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729151AbgKLQoI (ORCPT ); Thu, 12 Nov 2020 11:44:08 -0500 Received: from mx2.suse.de ([195.135.220.15]:49950 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729114AbgKLQoH (ORCPT ); Thu, 12 Nov 2020 11:44:07 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 9F45BAF84; Thu, 12 Nov 2020 16:44:04 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org, Rob Herring , Nicolas Saenz Julienne Cc: f.fainelli@gmail.com, linux-pwm@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com Subject: [PATCH v4 10/11] DO NOT MERGE: ARM: dts: Add RPi's official PoE hat support Date: Thu, 12 Nov 2020 17:36:28 +0100 Message-Id: <20201112163630.17177-11-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This is an example on how to enable the fan on top of RPi's official PoE hat. Signed-off-by: Nicolas Saenz Julienne --- Changes since v1: - Update patch to use 2 pwm cells arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 54 +++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts index 09a1182c2936..361db82619a4 100644 --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts @@ -5,6 +5,7 @@ #include "bcm283x-rpi-usb-peripheral.dtsi" #include +#include / { compatible = "raspberrypi,4-model-b", "brcm,bcm2711"; @@ -68,6 +69,54 @@ sd_vcc_reg: sd_vcc_reg { enable-active-high; gpio = <&expgpio 6 GPIO_ACTIVE_HIGH>; }; + + fan: pwm-fan { + compatible = "pwm-fan"; + cooling-levels = <0 50 150 255>; + #cooling-cells = <2>; + pwms = <&fwpwm RASPBERRYPI_FIRMWARE_PWM_POE 80000>; + }; + + thermal-zones { + cpu_thermal: cpu-thermal { + trips { + threshold: trip-point@0 { + temperature = <45000>; + hysteresis = <5000>; + type = "active"; + }; + + target: trip-point@1 { + temperature = <50000>; + hysteresis = <2000>; + type = "active"; + }; + + cpu_hot: cpu_hot@0 { + temperature = <55000>; + hysteresis = <2000>; + type = "active"; + }; + }; + + cooling-maps { + map0 { + trip = <&threshold>; + cooling-device = <&fan 0 1>; + }; + + map1 { + trip = <&target>; + cooling-device = <&fan 1 2>; + }; + + map2 { + trip = <&cpu_hot>; + cooling-device = <&fan 2 3>; + }; + }; + }; + }; }; &ddc0 { @@ -103,6 +152,11 @@ reset: reset { compatible = "raspberrypi,firmware-reset"; #reset-cells = <1>; }; + + fwpwm: pwm { + compatible = "raspberrypi,firmware-pwm"; + #pwm-cells = <2>; + }; }; &gpio { From patchwork Thu Nov 12 16:36:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1399109 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX6sh12TGz9sSf for ; Fri, 13 Nov 2020 03:45:28 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729012AbgKLQp0 (ORCPT ); Thu, 12 Nov 2020 11:45:26 -0500 Received: from mx2.suse.de ([195.135.220.15]:51300 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728977AbgKLQp0 (ORCPT ); Thu, 12 Nov 2020 11:45:26 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 87DC1AFC8; Thu, 12 Nov 2020 16:45:23 +0000 (UTC) From: Nicolas Saenz Julienne To: u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org, Thierry Reding , Lee Jones Cc: f.fainelli@gmail.com, linux-pwm@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, wahrenst@gmx.net, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, devel@driverdev.osuosl.org, p.zabel@pengutronix.de, linux-gpio@vger.kernel.org, linus.walleij@linaro.org, linux-clk@vger.kernel.org, sboyd@kernel.org, linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com, andy.shevchenko@gmail.com, Nicolas Saenz Julienne Subject: [PATCH v4 11/11] pwm: Add Raspberry Pi Firmware based PWM bus Date: Thu, 12 Nov 2020 17:36:29 +0100 Message-Id: <20201112163630.17177-12-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201112163630.17177-1-nsaenzjulienne@suse.de> References: <20201112163630.17177-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Adds support to control the PWM bus available in official Raspberry Pi PoE HAT. Only RPi's co-processor has access to it, so commands have to be sent through RPi's firmware mailbox interface. Signed-off-by: Nicolas Saenz Julienne --- Changes since v2: - Use devm_rpi_firmware_get() - Rename driver - Small cleanups Changes since v1: - Use default pwm bindings and get rid of xlate() function - Correct spelling errors - Correct apply() function - Round values - Fix divisions in arm32 mode - Small cleanups drivers/pwm/Kconfig | 9 ++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-raspberrypi-poe.c | 216 ++++++++++++++++++++++++++++++ 3 files changed, 226 insertions(+) create mode 100644 drivers/pwm/pwm-raspberrypi-poe.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index b2a87fd7e8fb..3445984a5a50 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -409,6 +409,15 @@ config PWM_PXA To compile this driver as a module, choose M here: the module will be called pwm-pxa. +config PWM_RASPBERRYPI_POE + tristate "Raspberry Pi Firwmware PoE Hat PWM support" + # Make sure not 'y' when RASPBERRYPI_FIRMWARE is 'm'. This can only + # happen when COMPILE_TEST=y, hence the added !RASPBERRYPI_FIRMWARE. + depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE) + help + Enable Raspberry Pi firmware controller PWM bus used to control the + official RPI PoE hat + config PWM_RCAR tristate "Renesas R-Car PWM support" depends on ARCH_RENESAS || COMPILE_TEST diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 18b89d7fd092..ed28d7bd4c64 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_PWM_MXS) += pwm-mxs.o obj-$(CONFIG_PWM_OMAP_DMTIMER) += pwm-omap-dmtimer.o obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o obj-$(CONFIG_PWM_PXA) += pwm-pxa.o +obj-$(CONFIG_PWM_RASPBERRYPI_POE) += pwm-raspberrypi-poe.o obj-$(CONFIG_PWM_RCAR) += pwm-rcar.o obj-$(CONFIG_PWM_RENESAS_TPU) += pwm-renesas-tpu.o obj-$(CONFIG_PWM_ROCKCHIP) += pwm-rockchip.o diff --git a/drivers/pwm/pwm-raspberrypi-poe.c b/drivers/pwm/pwm-raspberrypi-poe.c new file mode 100644 index 000000000000..91cd826a36f3 --- /dev/null +++ b/drivers/pwm/pwm-raspberrypi-poe.c @@ -0,0 +1,216 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2020 Nicolas Saenz Julienne + * For more information on Raspberry Pi's PoE hat see: + * https://www.raspberrypi.org/products/poe-hat/ + * + * Limitations: + * - No disable bit, so a disabled PWM is simulated by duty_cycle 0 + * - Only normal polarity + * - Fixed 12.5 kHz period + * + * The current period is completed when HW is reconfigured. + */ + +#include +#include +#include +#include + +#include +#include + +#define RPI_PWM_MAX_DUTY 255 +#define RPI_PWM_PERIOD_NS 80000 /* 12.5 kHz */ + +#define RPI_PWM_CUR_DUTY_REG 0x0 +#define RPI_PWM_DEF_DUTY_REG 0x1 + +struct raspberrypi_pwm { + struct rpi_firmware *firmware; + struct pwm_chip chip; + unsigned int duty_cycle; +}; + +struct raspberrypi_pwm_prop { + __le32 reg; + __le32 val; + __le32 ret; +} __packed; + +static inline struct raspberrypi_pwm *to_raspberrypi_pwm(struct pwm_chip *chip) +{ + return container_of(chip, struct raspberrypi_pwm, chip); +} + +static int raspberrypi_pwm_set_property(struct rpi_firmware *firmware, + u32 reg, u32 val) +{ + struct raspberrypi_pwm_prop msg = { + .reg = cpu_to_le32(reg), + .val = cpu_to_le32(val), + }; + int ret; + + ret = rpi_firmware_property(firmware, RPI_FIRMWARE_SET_POE_HAT_VAL, + &msg, sizeof(msg)); + if (ret) + return ret; + if (msg.ret) + return -EIO; + + return 0; +} + +static int raspberrypi_pwm_get_property(struct rpi_firmware *firmware, + u32 reg, u32 *val) +{ + struct raspberrypi_pwm_prop msg = { + .reg = reg + }; + int ret; + + ret = rpi_firmware_property(firmware, RPI_FIRMWARE_GET_POE_HAT_VAL, + &msg, sizeof(msg)); + if (ret) + return ret; + if (msg.ret) + return -EIO; + + *val = le32_to_cpu(msg.val); + + return 0; +} + +static void raspberrypi_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) +{ + struct raspberrypi_pwm *rpipwm = to_raspberrypi_pwm(chip); + + state->period = RPI_PWM_PERIOD_NS; + state->duty_cycle = DIV_ROUND_CLOSEST(rpipwm->duty_cycle * RPI_PWM_PERIOD_NS, + RPI_PWM_MAX_DUTY); + state->enabled = !!(rpipwm->duty_cycle); + state->polarity = PWM_POLARITY_NORMAL; +} + +static int raspberrypi_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) +{ + struct raspberrypi_pwm *rpipwm = to_raspberrypi_pwm(chip); + unsigned int duty_cycle; + int ret; + + if (state->period < RPI_PWM_PERIOD_NS || + state->polarity != PWM_POLARITY_NORMAL) + return -EINVAL; + + if (!state->enabled) + duty_cycle = 0; + else if (state->duty_cycle < RPI_PWM_PERIOD_NS) + duty_cycle = DIV_ROUND_CLOSEST_ULL(state->duty_cycle * RPI_PWM_MAX_DUTY, + RPI_PWM_PERIOD_NS); + else + duty_cycle = RPI_PWM_MAX_DUTY; + + if (duty_cycle == rpipwm->duty_cycle) + return 0; + + ret = raspberrypi_pwm_set_property(rpipwm->firmware, RPI_PWM_CUR_DUTY_REG, + duty_cycle); + if (ret) { + dev_err(chip->dev, "Failed to set duty cycle: %d\n", ret); + return ret; + } + + /* + * This sets the default duty cycle after resetting the board, we + * updated it every time to mimic Raspberry Pi's downstream's driver + * behaviour. + */ + ret = raspberrypi_pwm_set_property(rpipwm->firmware, RPI_PWM_DEF_DUTY_REG, + duty_cycle); + if (ret) { + dev_err(chip->dev, "Failed to set default duty cycle: %d\n", ret); + return ret; + } + + rpipwm->duty_cycle = duty_cycle; + + return 0; +} + +static const struct pwm_ops raspberrypi_pwm_ops = { + .get_state = raspberrypi_pwm_get_state, + .apply = raspberrypi_pwm_apply, + .owner = THIS_MODULE, +}; + +static int raspberrypi_pwm_probe(struct platform_device *pdev) +{ + struct device_node *firmware_node; + struct device *dev = &pdev->dev; + struct rpi_firmware *firmware; + struct raspberrypi_pwm *rpipwm; + int ret; + + firmware_node = of_get_parent(dev->of_node); + if (!firmware_node) { + dev_err(dev, "Missing firmware node\n"); + return -ENOENT; + } + + firmware = devm_rpi_firmware_get(&pdev->dev, firmware_node); + of_node_put(firmware_node); + if (!firmware) + return -EPROBE_DEFER; + + rpipwm = devm_kzalloc(&pdev->dev, sizeof(*rpipwm), GFP_KERNEL); + if (!rpipwm) + return -ENOMEM; + + rpipwm->firmware = firmware; + rpipwm->chip.dev = dev; + rpipwm->chip.ops = &raspberrypi_pwm_ops; + rpipwm->chip.base = -1; + rpipwm->chip.npwm = RASPBERRYPI_FIRMWARE_PWM_NUM; + + platform_set_drvdata(pdev, rpipwm); + + ret = raspberrypi_pwm_get_property(rpipwm->firmware, RPI_PWM_CUR_DUTY_REG, + &rpipwm->duty_cycle); + if (ret) { + dev_err(dev, "Failed to get duty cycle: %d\n", ret); + return ret; + } + + return pwmchip_add(&rpipwm->chip); +} + +static int raspberrypi_pwm_remove(struct platform_device *pdev) +{ + struct raspberrypi_pwm *rpipwm = platform_get_drvdata(pdev); + + return pwmchip_remove(&rpipwm->chip); +} + +static const struct of_device_id raspberrypi_pwm_of_match[] = { + { .compatible = "raspberrypi,firmware-pwm", }, + { } +}; +MODULE_DEVICE_TABLE(of, raspberrypi_pwm_of_match); + +static struct platform_driver raspberrypi_pwm_driver = { + .driver = { + .name = "raspberrypi-pwm", + .of_match_table = raspberrypi_pwm_of_match, + }, + .probe = raspberrypi_pwm_probe, + .remove = raspberrypi_pwm_remove, +}; +module_platform_driver(raspberrypi_pwm_driver); + +MODULE_AUTHOR("Nicolas Saenz Julienne "); +MODULE_DESCRIPTION("Raspberry Pi Firwmare Based PWM Bus Driver"); +MODULE_LICENSE("GPL v2");