Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753892AbaDVIFH (ORCPT ); Tue, 22 Apr 2014 04:05:07 -0400 Received: from mail-pd0-f179.google.com ([209.85.192.179]:39784 "EHLO mail-pd0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752250AbaDVIDt (ORCPT ); Tue, 22 Apr 2014 04:03:49 -0400 From: Vivek Gautam To: linux-usb@vger.kernel.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, kishon@ti.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, gregkh@linuxfoundation.org, balbi@ti.com, kgene.kim@samsung.com, t.figa@samsung.com, k.debski@samsung.com, sylvester.nawrocki@gmail.com Subject: [PATCH v5 2/2] phy: exynos5-usbdrd: Add facility for VBUS supply Date: Tue, 22 Apr 2014 13:33:15 +0530 Message-Id: <1398153795-28475-3-git-send-email-gautam.vivek@samsung.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1398153795-28475-1-git-send-email-gautam.vivek@samsung.com> References: <1398153795-28475-1-git-send-email-gautam.vivek@samsung.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adding support to enable/disable VBUS controlled by a regulator, to enable vbus supply on the port. Signed-off-by: Vivek Gautam --- This is v2 version of patch: [PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio on/off https://lkml.org/lkml/2014/4/9/186 Changes from v1: - Using regulator APIs instead of gpio to control VBUS. drivers/phy/phy-exynos5-usbdrd.c | 36 +++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c index 89d7ae8..d7e3745 100644 --- a/drivers/phy/phy-exynos5-usbdrd.c +++ b/drivers/phy/phy-exynos5-usbdrd.c @@ -23,6 +23,7 @@ #include #include #include +#include /* Exynos USB PHY registers */ #define EXYNOS5_FSEL_9MHZ6 0x0 @@ -172,6 +173,7 @@ struct exynos5_usbdrd_phy { unsigned int extrefclk; struct clk *ref_clk; unsigned long ref_rate; + struct regulator *vbus; }; #define to_usbdrd_phy(inst) \ @@ -442,6 +444,7 @@ static int exynos5_usbdrd_phy_exit(struct phy *phy) static int exynos5_usbdrd_phy_power_on(struct phy *phy) { + int ret; struct phy_usb_instance *inst = phy_get_drvdata(phy); struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst); @@ -449,10 +452,26 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy) clk_prepare_enable(phy_drd->ref_clk); + /* Enable VBUS supply */ + if (phy_drd->vbus) { + ret = regulator_enable(phy_drd->vbus); + if (ret) { + dev_err(phy_drd->dev, "Failed to enable VBUS supply\n"); + goto fail_vbus; + } + } + /* Power-on PHY*/ inst->phy_cfg->phy_isol(inst, 0); return 0; + +fail_vbus: + clk_disable_unprepare(phy_drd->ref_clk); + if (!IS_ERR(phy_drd->usb30_sclk)) + clk_disable_unprepare(phy_drd->usb30_sclk); + + return ret; } static int exynos5_usbdrd_phy_power_off(struct phy *phy) @@ -465,6 +484,10 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy) /* Power-off the PHY */ inst->phy_cfg->phy_isol(inst, 1); + /* Disable VBUS supply */ + if (phy_drd->vbus) + regulator_disable(phy_drd->vbus); + clk_disable_unprepare(phy_drd->ref_clk); return 0; @@ -537,7 +560,7 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev) const struct exynos5_usbdrd_phy_drvdata *drv_data; struct regmap *reg_pmu; u32 pmu_offset; - int i; + int i, ret; phy_drd = devm_kzalloc(dev, sizeof(*phy_drd), GFP_KERNEL); if (!phy_drd) @@ -580,6 +603,17 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev) return PTR_ERR(reg_pmu); } + /* Get required GPIO for vbus */ + phy_drd->vbus = devm_regulator_get(dev, "vbus"); + if (IS_ERR(phy_drd->vbus)) { + ret = PTR_ERR(phy_drd->vbus); + if (ret == -EPROBE_DEFER) + return ret; + + dev_warn(dev, "Failed to get VBUS supply regulator\n"); + phy_drd->vbus = NULL; + } + if (of_property_read_u32(node, "samsung,pmu-offset", &pmu_offset)) { dev_err(dev, "Missing pmu-offset for phy isolation\n"); return -EINVAL; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/