From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Sat, 10 May 2014 07:56:57 -0500 Subject: [PATCH v2 5/7] usb: ohci-platform: Enable optional use of reset controller In-Reply-To: <1399726619-30150-1-git-send-email-maxime.ripard@free-electrons.com> References: <1399726619-30150-1-git-send-email-maxime.ripard@free-electrons.com> Message-ID: <1399726619-30150-6-git-send-email-maxime.ripard@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The OHCI controllers used in the Allwinner A31 are asserted in reset using a global reset controller. Add optional support for such a controller in the OHCI platform driver. Signed-off-by: Maxime Ripard Reviewed-by: Hans de Goede --- Documentation/devicetree/bindings/usb/usb-ohci.txt | 1 + drivers/usb/host/ohci-platform.c | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/Documentation/devicetree/bindings/usb/usb-ohci.txt b/Documentation/devicetree/bindings/usb/usb-ohci.txt index 45f67d91e888..b968a1aea995 100644 --- a/Documentation/devicetree/bindings/usb/usb-ohci.txt +++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt @@ -12,6 +12,7 @@ Optional properties: - clocks : a list of phandle + clock specifier pairs - phys : phandle + phy specifier pair - phy-names : "usb" +- resets : phandle + reset specifier pair Example: diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c index b6002c951c5c..25073112abea 100644 --- a/drivers/usb/host/ohci-platform.c +++ b/drivers/usb/host/ohci-platform.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -36,6 +37,7 @@ struct ohci_platform_priv { struct clk *clks[OHCI_MAX_CLKS]; + struct reset_control *rst; struct phy *phy; }; @@ -191,6 +193,19 @@ static int ohci_platform_probe(struct platform_device *dev) break; } } + + priv->rst = devm_reset_control_get_optional(&dev->dev, + NULL); + if (IS_ERR(priv->rst)) { + err = PTR_ERR(priv->rst); + if (err == -EPROBE_DEFER) + goto err_put_clks; + priv->rst = NULL; + } else { + err = reset_control_deassert(priv->rst); + if (err) + goto err_put_clks; + } } if (pdata->big_endian_desc) @@ -266,6 +281,9 @@ static int ohci_platform_remove(struct platform_device *dev) if (pdata->power_off) pdata->power_off(dev); + if (priv->rst) + reset_control_assert(priv->rst); + for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) clk_put(priv->clks[clk]); -- 1.9.1