From patchwork Tue May 3 23:25:58 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naveen Kaje X-Patchwork-Id: 618193 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3qzy3Q4tm7z9s48 for ; Wed, 4 May 2016 09:26:10 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756856AbcECX0I (ORCPT ); Tue, 3 May 2016 19:26:08 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:48982 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756345AbcECX0I (ORCPT ); Tue, 3 May 2016 19:26:08 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id F1D0761315; Tue, 3 May 2016 23:26:06 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=ALL_TRUSTED,BAYES_00 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from nkaje-lnx.qualcomm.com (unknown [129.46.15.162]) (using TLSv1.1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: nkaje@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id B5B1160677; Tue, 3 May 2016 23:26:05 +0000 (UTC) From: Naveen Kaje To: wsa@the-dreams.de, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Cc: rruigrok@codeaurora.org, timur@codeaurora.org, cov@codeaurora.org, Naveen Kaje Subject: [PATCH 1/2] i2c: qup: add ACPI support Date: Tue, 3 May 2016 17:25:58 -0600 Message-Id: <1462317959-11632-1-git-send-email-nkaje@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Add support to get the device parameters from ACPI. Assume that the clocks are managed by firmware. Signed-off-by: Naveen Kaje --- drivers/i2c/busses/i2c-qup.c | 61 +++++++++++++++++++++++++++++++++----------- 1 file changed, 46 insertions(+), 15 deletions(-) diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c index 23eaabb..ef31b26 100644 --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -29,6 +29,7 @@ #include #include #include +#include /* QUP Registers */ #define QUP_CONFIG 0x000 @@ -132,6 +133,10 @@ /* Max timeout in ms for 32k bytes */ #define TOUT_MAX 300 +/* Default values. Use these if FW query fails */ +#define DEFAULT_CLK_FREQ 100000 +#define DEFAULT_SRC_CLK 20000000 + struct qup_i2c_block { int count; int pos; @@ -1360,9 +1365,10 @@ static int qup_i2c_probe(struct platform_device *pdev) struct resource *res; u32 io_mode, hw_ver, size; int ret, fs_div, hs_div; - int src_clk_freq; - u32 clk_freq = 100000; + u32 src_clk_freq = 0; + u32 clk_freq = 0; int blocks; + bool input_clk_ctrl = true; qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL); if (!qup) @@ -1372,7 +1378,14 @@ static int qup_i2c_probe(struct platform_device *pdev) init_completion(&qup->xfer); platform_set_drvdata(pdev, qup); - of_property_read_u32(node, "clock-frequency", &clk_freq); + ret = device_property_read_u32(qup->dev, "clock-frequency", &clk_freq); + if (ret) { + dev_warn(qup->dev, "using default clock-frequency values"); + clk_freq = DEFAULT_CLK_FREQ; + } + + if (ACPI_HANDLE(qup->dev) && !node) + input_clk_ctrl = false; if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) { qup->adap.algo = &qup_i2c_algo; @@ -1454,20 +1467,29 @@ nodma: return qup->irq; } - qup->clk = devm_clk_get(qup->dev, "core"); - if (IS_ERR(qup->clk)) { - dev_err(qup->dev, "Could not get core clock\n"); - return PTR_ERR(qup->clk); - } + if (input_clk_ctrl) { + qup->clk = devm_clk_get(qup->dev, "core"); + if (IS_ERR(qup->clk)) { + dev_err(qup->dev, "Could not get core clock\n"); + return PTR_ERR(qup->clk); + } - qup->pclk = devm_clk_get(qup->dev, "iface"); - if (IS_ERR(qup->pclk)) { - dev_err(qup->dev, "Could not get iface clock\n"); - return PTR_ERR(qup->pclk); + qup->pclk = devm_clk_get(qup->dev, "iface"); + if (IS_ERR(qup->pclk)) { + dev_err(qup->dev, "Could not get iface clock\n"); + return PTR_ERR(qup->pclk); + } + qup_i2c_enable_clocks(qup); + src_clk_freq = clk_get_rate(qup->clk); + } else { + ret = device_property_read_u32(qup->dev, + "src-clock-hz", &src_clk_freq); + if (ret) { + dev_warn(qup->dev, "using default src-clock-hz"); + src_clk_freq = DEFAULT_SRC_CLK; + } } - qup_i2c_enable_clocks(qup); - /* * Bootloaders might leave a pending interrupt on certain QUP's, * so we reset the core before registering for interrupts. @@ -1514,7 +1536,6 @@ nodma: size = QUP_INPUT_FIFO_SIZE(io_mode); qup->in_fifo_sz = qup->in_blk_sz * (2 << size); - src_clk_freq = clk_get_rate(qup->clk); fs_div = ((src_clk_freq / clk_freq) / 2) - 3; hs_div = 3; qup->clk_ctl = (hs_div << 8) | (fs_div & 0xff); @@ -1534,6 +1555,8 @@ nodma: qup->adap.dev.parent = qup->dev; qup->adap.dev.of_node = pdev->dev.of_node; qup->is_last = true; + if (ACPI_HANDLE(qup->dev)) + ACPI_COMPANION_SET(&qup->adap.dev, ACPI_COMPANION(qup->dev)); strlcpy(qup->adap.name, "QUP I2C adapter", sizeof(qup->adap.name)); @@ -1639,6 +1662,13 @@ static const struct of_device_id qup_i2c_dt_match[] = { }; MODULE_DEVICE_TABLE(of, qup_i2c_dt_match); +#if IS_ENABLED(CONFIG_ACPI) +static const struct acpi_device_id qup_i2c_acpi_match[] = { + { "QCOM8010"}, + { }, +}; +MODULE_DEVICE_TABLE(acpi, qup_i2c_acpi_ids); +#endif static struct platform_driver qup_i2c_driver = { .probe = qup_i2c_probe, .remove = qup_i2c_remove, @@ -1646,6 +1676,7 @@ static struct platform_driver qup_i2c_driver = { .name = "i2c_qup", .pm = &qup_i2c_qup_pm_ops, .of_match_table = qup_i2c_dt_match, + .acpi_match_table = ACPI_PTR(qup_i2c_acpi_match), }, };