From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752647AbbJFNlP (ORCPT ); Tue, 6 Oct 2015 09:41:15 -0400 Received: from mailout2.w1.samsung.com ([210.118.77.12]:14726 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751706AbbJFNlN (ORCPT ); Tue, 6 Oct 2015 09:41:13 -0400 X-AuditID: cbfec7f5-f794b6d000001495-f7-5613cf7603e7 From: Marek Szyprowski To: linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org Cc: Marek Szyprowski , Krzysztof Kozlowski , Kishon Vijay Abraham I Subject: [PATCH RESEND] phy: exynos-usb2: add vbus regulator support Date: Tue, 06 Oct 2015 15:41:00 +0200 Message-id: <1444138860-23595-1-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.9.2 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrGJMWRmVeSWpSXmKPExsVy+t/xq7pl54XDDO7OUbB4/cLQ4sLTHjaL y7vmsFnMOL+PyWLtkbvsDqwefVtWMXocv7GdyePzJrkA5igum5TUnMyy1CJ9uwSujOZbZ1gL nshVbD+2nb2BcapkFyMnh4SAicS2uQsYIWwxiQv31rOB2EICSxklmg5bQNhNTBLHD2qA2GwC hhJdb7vAakQEnCVuf/jG0sXIxcEs0MUo8fn0YRaQhLCAi8S6PdfAbBYBVYn/386zgti8Ah4S p9peM0Msk5P4/3IF0wRG7gWMDKsYRVNLkwuKk9JzjfSKE3OLS/PS9ZLzczcxQnz/dQfj0mNW hxgFOBiVeHglbgqFCbEmlhVX5h5ilOBgVhLhVTgiHCbEm5JYWZValB9fVJqTWnyIUZqDRUmc d+au9yFCAumJJanZqakFqUUwWSYOTqkGRlHhiv2l0vZOzFmLA0+vkJg+f13DfCN9i867H+/k x/k1F3vt5Lp84rOF3a+/5feerb1WeVBaexODgcy1f+fmKJ/1ZtDQc6vh8Z4hpbee+Yu+gP6z xNlML5eI/6zamnSh1mIzx+J0lfMJ3QyHSvULT5xpb91mt7mRt1n8fJZgQ7IBt7O887afSizF GYmGWsxFxYkAl0UjCfkBAAA= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Exynos USB2 PHY has separate power supply, which is usually provided by VBUS regulator. This patch adds support for it. VBUS regulator is optional, to keep compatibility with boards, which have VBUS provided from some always-on power source. Signed-off-by: Marek Szyprowski --- This is just a resend of a patch posted in the following thread: https://lkml.org/lkml/2015/8/21/306 I really hope that it will finally get merged to v4.4. For more information and background, please refer to the mentioned thread. Marek Szyprowski --- .../devicetree/bindings/phy/samsung-phy.txt | 3 +++ drivers/phy/phy-samsung-usb2.c | 25 ++++++++++++++++++++-- drivers/phy/phy-samsung-usb2.h | 2 ++ 3 files changed, 28 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt index 60c6f2a..0289d3b 100644 --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt @@ -44,6 +44,9 @@ Required properties: - the "ref" clock is used to get the rate of the clock provided to the PHY module +Optional properties: +- vbus-supply: power-supply phandle for vbus power source + The first phandle argument in the PHY specifier identifies the PHY, its meaning is compatible dependent. For the currently supported SoCs (Exynos 4210 and Exynos 4212) it is as follows: diff --git a/drivers/phy/phy-samsung-usb2.c b/drivers/phy/phy-samsung-usb2.c index f278a9c..1d22d93 100644 --- a/drivers/phy/phy-samsung-usb2.c +++ b/drivers/phy/phy-samsung-usb2.c @@ -27,6 +27,13 @@ static int samsung_usb2_phy_power_on(struct phy *phy) dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n", inst->cfg->label); + + if (drv->vbus) { + ret = regulator_enable(drv->vbus); + if (ret) + goto err_regulator; + } + ret = clk_prepare_enable(drv->clk); if (ret) goto err_main_clk; @@ -48,6 +55,9 @@ err_power_on: err_instance_clk: clk_disable_unprepare(drv->clk); err_main_clk: + if (drv->vbus) + regulator_disable(drv->vbus); +err_regulator: return ret; } @@ -55,7 +65,7 @@ static int samsung_usb2_phy_power_off(struct phy *phy) { struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy); struct samsung_usb2_phy_driver *drv = inst->drv; - int ret; + int ret = 0; dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n", inst->cfg->label); @@ -68,7 +78,10 @@ static int samsung_usb2_phy_power_off(struct phy *phy) } clk_disable_unprepare(drv->ref_clk); clk_disable_unprepare(drv->clk); - return 0; + if (drv->vbus) + ret = regulator_disable(drv->vbus); + + return ret; } static const struct phy_ops samsung_usb2_phy_ops = { @@ -203,6 +216,14 @@ static int samsung_usb2_phy_probe(struct platform_device *pdev) return ret; } + drv->vbus = devm_regulator_get(dev, "vbus"); + if (IS_ERR(drv->vbus)) { + ret = PTR_ERR(drv->vbus); + if (ret == -EPROBE_DEFER) + return ret; + drv->vbus = NULL; + } + for (i = 0; i < drv->cfg->num_phys; i++) { char *label = drv->cfg->phys[i].label; struct samsung_usb2_phy_instance *p = &drv->instances[i]; diff --git a/drivers/phy/phy-samsung-usb2.h b/drivers/phy/phy-samsung-usb2.h index 44bead9..6563e7c 100644 --- a/drivers/phy/phy-samsung-usb2.h +++ b/drivers/phy/phy-samsung-usb2.h @@ -17,6 +17,7 @@ #include #include #include +#include #define KHZ 1000 #define MHZ (KHZ * KHZ) @@ -37,6 +38,7 @@ struct samsung_usb2_phy_driver { const struct samsung_usb2_phy_config *cfg; struct clk *clk; struct clk *ref_clk; + struct regulator *vbus; unsigned long ref_rate; u32 ref_reg_val; struct device *dev; -- 1.9.2