| Message ID | 1399034855-9686-4-git-send-email-gautam.vivek@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Vivek, This looks much better, but there still are some issues. Please see my comments inline. On 02.05.2014 14:47, Vivek Gautam wrote: > Add support to consume phy provided by Generic phy framework. > Keeping the support for older usb-phy intact right now, in order > to prevent any functionality break in absence of relevant > device tree side change for ohci-exynos. > Once we move to new phy in the device nodes for ohci, we can > remove the support for older phys. > > Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com> > Cc: Jingoo Han <jg1.han@samsung.com> > Acked-by: Alan Stern <stern@rowland.harvard.edu> > --- > > Changes from v4: > - Removed 'phy-names' property from the bindings since we don't need it. > - Restructured exynos_ohci_get_phy() function to handle error codes as > well as return relevant error codes effectively. > - Added IS_ERR() check for PHYs in exynos_ohci_phy_enable()/disable(). > > Changes from v3: > - Calling usb_phy_shutdown() when exynos_ohci_phy_enable() is failing. > - Made exynos_ohci_phy_disable() return void, since its return value > did not serve any purpose. > - Calling clk_disable_unprepare() in exynos_ohci_resume() when > exynos_ohci_phy_enable() is failed. > > .../devicetree/bindings/usb/exynos-usb.txt | 16 +++ > drivers/usb/host/ohci-exynos.c | 120 +++++++++++++++++--- > 2 files changed, 120 insertions(+), 16 deletions(-) > > diff --git a/Documentation/devicetree/bindings/usb/exynos-usb.txt b/Documentation/devicetree/bindings/usb/exynos-usb.txt > index d967ba1..49a9c6f 100644 > --- a/Documentation/devicetree/bindings/usb/exynos-usb.txt > +++ b/Documentation/devicetree/bindings/usb/exynos-usb.txt > @@ -38,6 +38,13 @@ Required properties: > - interrupts: interrupt number to the cpu. > - clocks: from common clock binding: handle to usb clock. > - clock-names: from common clock binding: Shall be "usbhost". > + - port: if in the SoC there are OHCI phys, they should be listed here. > + One phy per port. Each port should have following entries: > + - reg: port number on OHCI controller, e.g > + On Exynos5250, port 0 is USB2.0 otg phy > + port 1 is HSIC phy0 > + port 2 is HSIC phy1 > + - phys: from the *Generic PHY* bindings, specifying phy used by port. > > Example: > usb@12120000 { > @@ -47,6 +54,15 @@ Example: > > clocks = <&clock 285>; > clock-names = "usbhost"; > + > + #address-cells = <1>; > + #size-cells = <0>; > + port@0 { > + reg = <0>; > + phys = <&usb2phy 1>; > + status = "disabled"; > + }; > + > }; > > DWC3 > diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c > index 05f00e3..e66d391 100644 > --- a/drivers/usb/host/ohci-exynos.c > +++ b/drivers/usb/host/ohci-exynos.c > @@ -18,6 +18,7 @@ > #include <linux/module.h> > #include <linux/of.h> > #include <linux/platform_device.h> > +#include <linux/phy/phy.h> > #include <linux/usb/phy.h> > #include <linux/usb/samsung_usb_phy.h> > #include <linux/usb.h> > @@ -33,28 +34,112 @@ static struct hc_driver __read_mostly exynos_ohci_hc_driver; > > #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv) > > +#define PHY_NUMBER 3 > + > struct exynos_ohci_hcd { > struct clk *clk; > struct usb_phy *phy; > struct usb_otg *otg; > + struct phy *phy_g[PHY_NUMBER]; > }; > > -static void exynos_ohci_phy_enable(struct device *dev) > +static int exynos_ohci_get_phy(struct device *dev, > + struct exynos_ohci_hcd *exynos_ohci) > +{ > + struct device_node *child; > + struct phy *phy; > + int phy_number; > + int ret = 0; > + > + exynos_ohci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); > + if (IS_ERR(exynos_ohci->phy)) { > + ret = PTR_ERR(exynos_ohci->phy); > + if (ret != -ENXIO && ret != -ENODEV) { > + dev_err(dev, "no usb2 phy configured\n"); > + return ret; > + } > + dev_dbg(dev, "Failed to get usb2 phy\n"); > + exynos_ohci->phy = ERR_PTR(-ENODEV); Here you already have exynos_ohci->phy set to an ERR_PTR() value, which was returned by devm_usb_get_phy(). There is no need to overwrite it. > + } else { > + exynos_ohci->otg = exynos_ohci->phy->otg; > + } > + > + /* > + * Getting generic phy: > + * We are keeping both types of phys as a part of transiting OHCI > + * to generic phy framework, so as to maintain backward compatibilty > + * with old DTB. > + * If there are existing devices using DTB files built from them, > + * to remove the support for old bindings in this driver, > + * we need to make sure that such devices have their DTBs > + * updated to ones built from new DTS. > + */ > + for_each_available_child_of_node(dev->of_node, child) { > + ret = of_property_read_u32(child, "reg", &phy_number); > + if (ret) { > + dev_err(dev, "Failed to parse device tree\n"); > + of_node_put(child); > + return ret; > + } > + > + if (phy_number >= PHY_NUMBER) { > + dev_err(dev, "Invalid number of PHYs\n"); > + of_node_put(child); > + return -EINVAL; > + } > + > + phy = devm_of_phy_get(dev, child, 0); > + of_node_put(child); > + if (IS_ERR(phy)) { > + ret = PTR_ERR(phy); > + if (ret != -ENXIO && ret != -ENODEV) { Shouldn't this be -ENOSYS instead of -ENXIO? At least this is the error code I can see in the stubs provided in include/linux/phy/phy.h. > + dev_err(dev, "no usb2 phy configured\n"); > + return ret; > + } > + dev_dbg(dev, "Failed to get usb2 phy\n"); > + phy = ERR_PTR(-ENODEV); phy is already an ERR_PTR() here, as returned by devm_of_phy_get(). I guess the same comments apply to patch 4/4. Best regards, Tomasz
diff --git a/Documentation/devicetree/bindings/usb/exynos-usb.txt b/Documentation/devicetree/bindings/usb/exynos-usb.txt index d967ba1..49a9c6f 100644 --- a/Documentation/devicetree/bindings/usb/exynos-usb.txt +++ b/Documentation/devicetree/bindings/usb/exynos-usb.txt @@ -38,6 +38,13 @@ Required properties: - interrupts: interrupt number to the cpu. - clocks: from common clock binding: handle to usb clock. - clock-names: from common clock binding: Shall be "usbhost". + - port: if in the SoC there are OHCI phys, they should be listed here. + One phy per port. Each port should have following entries: + - reg: port number on OHCI controller, e.g + On Exynos5250, port 0 is USB2.0 otg phy + port 1 is HSIC phy0 + port 2 is HSIC phy1 + - phys: from the *Generic PHY* bindings, specifying phy used by port. Example: usb@12120000 { @@ -47,6 +54,15 @@ Example: clocks = <&clock 285>; clock-names = "usbhost"; + + #address-cells = <1>; + #size-cells = <0>; + port@0 { + reg = <0>; + phys = <&usb2phy 1>; + status = "disabled"; + }; + }; DWC3 diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c index 05f00e3..e66d391 100644 --- a/drivers/usb/host/ohci-exynos.c +++ b/drivers/usb/host/ohci-exynos.c @@ -18,6 +18,7 @@ #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> +#include <linux/phy/phy.h> #include <linux/usb/phy.h> #include <linux/usb/samsung_usb_phy.h> #include <linux/usb.h> @@ -33,28 +34,112 @@ static struct hc_driver __read_mostly exynos_ohci_hc_driver; #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv) +#define PHY_NUMBER 3 + struct exynos_ohci_hcd { struct clk *clk; struct usb_phy *phy; struct usb_otg *otg; + struct phy *phy_g[PHY_NUMBER]; }; -static void exynos_ohci_phy_enable(struct device *dev) +static int exynos_ohci_get_phy(struct device *dev, + struct exynos_ohci_hcd *exynos_ohci) +{ + struct device_node *child; + struct phy *phy; + int phy_number; + int ret = 0; + + exynos_ohci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); + if (IS_ERR(exynos_ohci->phy)) { + ret = PTR_ERR(exynos_ohci->phy); + if (ret != -ENXIO && ret != -ENODEV) { + dev_err(dev, "no usb2 phy configured\n"); + return ret; + } + dev_dbg(dev, "Failed to get usb2 phy\n"); + exynos_ohci->phy = ERR_PTR(-ENODEV); + } else { + exynos_ohci->otg = exynos_ohci->phy->otg; + } + + /* + * Getting generic phy: + * We are keeping both types of phys as a part of transiting OHCI + * to generic phy framework, so as to maintain backward compatibilty + * with old DTB. + * If there are existing devices using DTB files built from them, + * to remove the support for old bindings in this driver, + * we need to make sure that such devices have their DTBs + * updated to ones built from new DTS. + */ + for_each_available_child_of_node(dev->of_node, child) { + ret = of_property_read_u32(child, "reg", &phy_number); + if (ret) { + dev_err(dev, "Failed to parse device tree\n"); + of_node_put(child); + return ret; + } + + if (phy_number >= PHY_NUMBER) { + dev_err(dev, "Invalid number of PHYs\n"); + of_node_put(child); + return -EINVAL; + } + + phy = devm_of_phy_get(dev, child, 0); + of_node_put(child); + if (IS_ERR(phy)) { + ret = PTR_ERR(phy); + if (ret != -ENXIO && ret != -ENODEV) { + dev_err(dev, "no usb2 phy configured\n"); + return ret; + } + dev_dbg(dev, "Failed to get usb2 phy\n"); + phy = ERR_PTR(-ENODEV); + } + exynos_ohci->phy_g[phy_number] = phy; + } + + return ret; +} + +static int exynos_ohci_phy_enable(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); + int i; + int ret = 0; + + if (!IS_ERR(exynos_ohci->phy)) + return usb_phy_init(exynos_ohci->phy); - if (exynos_ohci->phy) - usb_phy_init(exynos_ohci->phy); + for (i = 0; ret == 0 && i < PHY_NUMBER; i++) + if (!IS_ERR(exynos_ohci->phy_g[i])) + ret = phy_power_on(exynos_ohci->phy_g[i]); + if (ret) + for (i--; i >= 0; i--) + if (!IS_ERR(exynos_ohci->phy_g[i])) + phy_power_off(exynos_ohci->phy_g[i]); + + return ret; } static void exynos_ohci_phy_disable(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); + int i; - if (exynos_ohci->phy) + if (!IS_ERR(exynos_ohci->phy)) { usb_phy_shutdown(exynos_ohci->phy); + return; + } + + for (i = 0; i < PHY_NUMBER; i++) + if (!IS_ERR(exynos_ohci->phy_g[i])) + phy_power_off(exynos_ohci->phy_g[i]); } static int exynos_ohci_probe(struct platform_device *pdev) @@ -62,7 +147,6 @@ static int exynos_ohci_probe(struct platform_device *pdev) struct exynos_ohci_hcd *exynos_ohci; struct usb_hcd *hcd; struct resource *res; - struct usb_phy *phy; int irq; int err; @@ -88,15 +172,9 @@ static int exynos_ohci_probe(struct platform_device *pdev) "samsung,exynos5440-ohci")) goto skip_phy; - phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); - if (IS_ERR(phy)) { - usb_put_hcd(hcd); - dev_warn(&pdev->dev, "no platform data or transceiver defined\n"); - return -EPROBE_DEFER; - } else { - exynos_ohci->phy = phy; - exynos_ohci->otg = phy->otg; - } + err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci); + if (err) + goto fail_clk; skip_phy: exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); @@ -139,7 +217,11 @@ skip_phy: platform_set_drvdata(pdev, hcd); - exynos_ohci_phy_enable(&pdev->dev); + err = exynos_ohci_phy_enable(&pdev->dev); + if (err) { + dev_err(&pdev->dev, "Failed to enable USB phy\n"); + goto fail_io; + } err = usb_add_hcd(hcd, irq, IRQF_SHARED); if (err) { @@ -210,13 +292,19 @@ static int exynos_ohci_resume(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); + int ret; clk_prepare_enable(exynos_ohci->clk); if (exynos_ohci->otg) exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self); - exynos_ohci_phy_enable(dev); + ret = exynos_ohci_phy_enable(dev); + if (ret) { + dev_err(dev, "Failed to enable USB phy\n"); + clk_disable_unprepare(exynos_ohci->clk); + return ret; + } ohci_resume(hcd, false);