From patchwork Thu Oct 20 15:16:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Dooks X-Patchwork-Id: 1692607 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=sifive.com header.i=@sifive.com header.a=rsa-sha256 header.s=google header.b=kUl9Fn1q; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4MtWQz1nctz23k2 for ; Fri, 21 Oct 2022 02:16:43 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230168AbiJTPQl (ORCPT ); Thu, 20 Oct 2022 11:16:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230186AbiJTPQ3 (ORCPT ); Thu, 20 Oct 2022 11:16:29 -0400 Received: from mail-wm1-x329.google.com (mail-wm1-x329.google.com [IPv6:2a00:1450:4864:20::329]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B79E14D1EB for ; Thu, 20 Oct 2022 08:16:25 -0700 (PDT) Received: by mail-wm1-x329.google.com with SMTP id c3-20020a1c3503000000b003bd21e3dd7aso2621485wma.1 for ; Thu, 20 Oct 2022 08:16:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=bZarqMDc/6hKea1bOExuvbbOHo7DHkLG1khhfpxmIGM=; b=kUl9Fn1q+aZsdRTOjhrkoXMDey98D5TOPUmDIZjP243GrvBNHcjvExeRw2qla6Dn2s wwPh2Jv10B99vtROzuhZWUc2Jvum1/rlaN5ljNHjq9a1a9C+vhmKLmT5jpEv9bSFw1kw 31ABCbZeh997hyzZJt7Fvc9yldZH2/1LWpcxpOM3bNZv2M1D/KTjqMnnKfmRaMvcXn0e 3ziF6yG+BoEH3C8rwcgHmhJpSFzSwEDzuDIeVrkhyb+Ba3vJtc/PzL/xiUBbhnmnq31U 7w/pZRx84D978Bycu1mOY0VwFzX6q37OsMmdTzEbEk5D6sfr1yIq/gZkyVYlTmYEXFP2 AScQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=bZarqMDc/6hKea1bOExuvbbOHo7DHkLG1khhfpxmIGM=; b=YeJhV3CLohdjz0QIw6gMhmp+5GxYIkZiBJ7+YKOL31zMgkFr1RXUM+uKFuFTm11hwS T6ZYwhfCu/Fp1kZI8VJkPkUIRxvoQ+cieGmNsPfbk9oyPl7/hdqjBFy/OAVnGzpDi8BH vsLtpAELFfMJQwjuB3NHwvGk+CSO0CEpWIT0tdX9pb6sCoNM9RkZFEKbC5DCLVMoW7vN 2fKW9t4ZAGLaF3nfzzdqE8j5tkbVwZB4p0mqb+3LmhpIbaWMwSzoK4RJ2KBiOyW6lhSJ zRHDWF8M0YeAleY5eVF1SCB3fnbymOuGe01l3z+rj4NnWkx1rEePe3MJhQXoabcRWMeE Rr7Q== X-Gm-Message-State: ACrzQf130mml910hjvsjj1PexZ7ZM3YjULiSJue+HoOcGlX+LNPa1w5w SEK9Ggfs8hgpqf8C9Q9Hj4Z4xn4tGW2hr23bfpOiOugZUn9lqK8KrARZ4CXayuZsFVNW3MntKkQ Po0lIyZCa9fZl6Q5SXVk93Xrr0POcy3euq79DvzClVv3jFV6k2ZldJtv45UfO7PVP8j0k+tkDLT 4= X-Google-Smtp-Source: AMsMyM4Xm8eKo2xPrKbd8eTNCp68NN/TVIHDvU2fhqdyrg6aDFGVPEUg71PqFQxeT5LpFeKF1QiqIg== X-Received: by 2002:a1c:4c03:0:b0:3c4:c76:9fe3 with SMTP id z3-20020a1c4c03000000b003c40c769fe3mr30380738wmf.13.1666278983410; Thu, 20 Oct 2022 08:16:23 -0700 (PDT) Received: from rainbowdash.guest.codethink.co.uk ([167.98.27.226]) by smtp.gmail.com with ESMTPSA id bg6-20020a05600c3c8600b003c6f3e5ba42sm41362wmb.46.2022.10.20.08.16.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Oct 2022 08:16:22 -0700 (PDT) From: Ben Dooks To: linux-pwm@vger.kernel.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Lee Jones , u.kleine-koenig@pengutronix.de, Thierry Reding , Krzysztof Kozlowski , Greentime Hu , jarkko.nikula@linux.intel.com, William Salmon , Jude Onyenegecha , Ben Dooks Subject: [PATCH v6 08/10] pwm: dwc: add of/platform support Date: Thu, 20 Oct 2022 16:16:08 +0100 Message-Id: <20221020151610.59443-9-ben.dooks@sifive.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221020151610.59443-1-ben.dooks@sifive.com> References: <20221020151610.59443-1-ben.dooks@sifive.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org The dwc pwm controller can be used in non-PCI systems, so allow either platform or OF based probing. Signed-off-by: Ben Dooks --- v5: - fix missing " in kconfig - remove .remove method, devm already sorts this. - merge pwm-number code - split the of code out of the core - get bus clock v4: - moved the compile test code earlier - fixed review comments - used NS_PER_SEC - use devm_clk_get_enabled - ensure we get the bus clock v3: - changed compatible name fixup add pwm/Kconfig --- drivers/pwm/Kconfig | 9 +++++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-dwc-of.c | 76 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 86 insertions(+) create mode 100644 drivers/pwm/pwm-dwc-of.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index a9f1c554db2b..c734f58a8bfc 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -192,6 +192,15 @@ config PWM_DWC_PCI To compile this driver as a module, choose M here: the module will be called pwm-dwc-pci. +config PWM_DWC_OF + tristate "DesignWare PWM Controller (OF bus)" + depends on PWM_DWC && OF + help + PWM driver for Synopsys DWC PWM Controller on an OF bus. + + To compile this driver as a module, choose M here: the module + will be called pwm-dwc-of. + config PWM_EP93XX tristate "Cirrus Logic EP93xx PWM support" depends on ARCH_EP93XX || COMPILE_TEST diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index a70d36623129..d1fd1641f077 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o obj-$(CONFIG_PWM_CRC) += pwm-crc.o obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o obj-$(CONFIG_PWM_DWC) += pwm-dwc.o +obj-$(CONFIG_PWM_DWC_OF) += pwm-dwc-of.o obj-$(CONFIG_PWM_DWC_PCI) += pwm-dwc-pci.o obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o diff --git a/drivers/pwm/pwm-dwc-of.c b/drivers/pwm/pwm-dwc-of.c new file mode 100644 index 000000000000..c5b4351cc7b0 --- /dev/null +++ b/drivers/pwm/pwm-dwc-of.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DesignWare PWM Controller driver OF + * + * Copyright (C) 2022 SiFive, Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "pwm-dwc.h" + +static int dwc_pwm_plat_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct dwc_pwm *dwc; + struct clk *bus; + u32 nr_pwm; + + dwc = dwc_pwm_alloc(dev); + if (!dwc) + return -ENOMEM; + + if (!device_property_read_u32(dev, "snps,pwm-number", &nr_pwm)) { + if (nr_pwm > DWC_TIMERS_TOTAL) + dev_err(dev, "too many PWMs (%d) specified, capping at %d\n", + nr_pwm, dwc->chip.npwm); + else + dwc->chip.npwm = nr_pwm; + } + + dwc->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(dwc->base)) + return PTR_ERR(dwc->base); + + bus = devm_clk_get_enabled(dev, NULL); + if (IS_ERR(bus)) + return dev_err_probe(dev, PTR_ERR(bus), + "failed to get clock\n"); + + dwc->clk = devm_clk_get_enabled(dev, "timer"); + if (IS_ERR(dwc->clk)) + return dev_err_probe(dev, PTR_ERR(dwc->clk), + "failed to get timer clock\n"); + + dwc->clk_ns = NSEC_PER_SEC / clk_get_rate(dwc->clk); + return devm_pwmchip_add(dev, &dwc->chip); +} + +static const struct of_device_id dwc_pwm_dt_ids[] = { + { .compatible = "snps,dw-apb-timers-pwm2" }, + { }, +}; +MODULE_DEVICE_TABLE(of, dwc_pwm_dt_ids); + +static struct platform_driver dwc_pwm_plat_driver = { + .driver = { + .name = "dwc-pwm", + .of_match_table = dwc_pwm_dt_ids, + }, + .probe = dwc_pwm_plat_probe, +}; + +module_platform_driver(dwc_pwm_plat_driver); + +MODULE_ALIAS("platform:dwc-pwm-of"); +MODULE_AUTHOR("Ben Dooks "); +MODULE_DESCRIPTION("DesignWare PWM Controller"); +MODULE_LICENSE("GPL");