On 11/01/14 11:46, Hans de Goede wrote:
Add support for ohci-platform instantiation from devicetree, including optionally getting clks and a phy from devicetree, and enabling / disabling those on power_on / off. This should allow using ohci-platform from devicetree in various cases. Specifically after this commit it can be used for the ohci controller found on Allwinner sunxi SoCs. Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> --- .../devicetree/bindings/usb/mmio-ohci.txt | 22 +++ drivers/usb/host/ohci-platform.c | 164 ++++++++++++++++++--- 2 files changed, 162 insertions(+), 24 deletions(-) create mode 100644 Documentation/devicetree/bindings/usb/mmio-ohci.txt diff --git a/Documentation/devicetree/bindings/usb/mmio-ohci.txt b/Documentation/devicetree/bindings/usb/mmio-ohci.txt new file mode 100644 index 0000000..9c776ed --- /dev/null +++ b/Documentation/devicetree/bindings/usb/mmio-ohci.txt @@ -0,0 +1,22 @@ +Generic MMIO OHCI controller + +Required properties: +- compatible : "mmio-ohci" +- reg : ohci controller register range (address and length) +- interrupts : ohci controller interrupt + +Optional properties: +- clocks : a list of phandle + clock specifier pairs +- phys : phandle + phy specifier pair +- phy-names : "usb" + +Example: + + ohci0: ohci@0x01c14400 { + compatible = "mmio-ohci"; + reg = <0x01c14400 0x100>; + interrupts = <64>; + clocks = <&usb_clk 6>, <&ahb_gates 2>; + phys = <&usbphy 1>; + phy-names = "usb"; + }; ... <snip> .... @@ -83,17 +156,40 @@ static int ohci_platform_probe(struct platform_device *dev) return -ENXIO; }+ hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,+ dev_name(&dev->dev)); + if (!hcd) + return -ENOMEM; + + platform_set_drvdata(dev, hcd); + dev->dev.platform_data = pdata; + priv = hcd_to_ohci_priv(hcd); + + if (pdata == &ohci_platform_defaults && dev->dev.of_node) { + priv->phy = devm_phy_get(&dev->dev, "usb"); + if (IS_ERR(priv->phy)) { + err = PTR_ERR(priv->phy); + if (err == -EPROBE_DEFER) + goto err_put_hcd; + priv->phy = NULL; + } + + for (clk = 0; clk < OHCI_MAX_CLKS; clk++) { + priv->clks[clk] = of_clk_get(dev->dev.of_node, clk); + if (IS_ERR(priv->clks[clk])) { + err = PTR_ERR(priv->clks[clk]); + if (err == -EPROBE_DEFER) + goto err_put_clks; + priv->clks[clk] = NULL; + break; + } + } + }
Given that you have limited the clock parsing to OHCI_MAX_CLKS, there should be some kind of warning/error message if the DT contains more than OHCI_MAX_CLKS - otherwise you have silent failures when the clocks aren't configured.
There is also no note in the binding to indicate this limitation and you shouldn't expect people writing DT files to go digging through the source to check for this.
Regards Tony P -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
