The PHY clock, clock rate, VCC regulator and RESET regulator can now be provided via device tree.
Signed-off-by: Roger Quadros <[email protected]> --- .../devicetree/bindings/usb/usb-nop-xceiv.txt | 34 ++++++++++++++++++++ drivers/usb/otg/nop-usb-xceiv.c | 31 ++++++++++++++++++ 2 files changed, 65 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt diff --git a/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt b/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt new file mode 100644 index 0000000..d7e2726 --- /dev/null +++ b/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt @@ -0,0 +1,34 @@ +USB NOP PHY + +Required properties: +- compatible: should be usb-nop-xceiv + +Optional properties: +- clocks: phandle to the PHY clock. Use as per Documentation/devicetree + /bindings/clock/clock-bindings.txt + This property is required if clock-frequency is specified. + +- clock-names: Should be "main_clk" + +- clock-frequency: the clock frequency (in Hz) that the PHY clock must + be configured to. + +- vcc-supply: phandle to the regulator that provides RESET to the PHY. + +- reset-supply: phandle to the regulator that provides power to the PHY. + +Example: + + hsusb1_phy { + compatible = "usb-nop-xceiv"; + clock-frequency = <19200000>; + clocks = <&osc 0>; + clock-names = "main_clk"; + vcc-supply = <&hsusb1_vcc_regulator>; + reset-supply = <&hsusb1_reset_regulator>; + }; + +hsusb1_phy is a NOP USB PHY device that gets its clock from an oscillator +and expects that clock to be configured to 19.2MHz by the NOP PHY driver. +hsusb1_vcc_regulator provides power to the PHY and hsusb1_reset_regulator +controls RESET. diff --git a/drivers/usb/otg/nop-usb-xceiv.c b/drivers/usb/otg/nop-usb-xceiv.c index ac027a1..adbb7ab 100644 --- a/drivers/usb/otg/nop-usb-xceiv.c +++ b/drivers/usb/otg/nop-usb-xceiv.c @@ -34,6 +34,7 @@ #include <linux/slab.h> #include <linux/clk.h> #include <linux/regulator/consumer.h> +#include <linux/of.h> struct nop_usb_xceiv { struct usb_phy phy; @@ -138,8 +139,19 @@ static int nop_set_host(struct usb_otg *otg, struct usb_bus *host) return 0; } +static void nop_xeiv_get_dt_pdata(struct device *dev, + struct nop_usb_xceiv_platform_data *pdata) +{ + struct device_node *node = dev->of_node; + u32 clk_rate; + + if (!of_property_read_u32(node, "clock-frequency", &clk_rate)) + pdata->clk_rate = clk_rate; +} + static int nop_usb_xceiv_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; struct nop_usb_xceiv_platform_data *pdata = pdev->dev.platform_data; struct nop_usb_xceiv *nop; enum usb_phy_type type = USB_PHY_TYPE_USB2; @@ -153,6 +165,17 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev) if (!nop->phy.otg) return -ENOMEM; + if (dev->of_node) { + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) { + dev_err(dev, "Memory allocation failure\n"); + return -ENOMEM; + } + nop_xeiv_get_dt_pdata(dev, pdata); + } else { + pdata = dev->platform_data; + } + if (pdata) type = pdata->type; @@ -236,12 +259,20 @@ static int nop_usb_xceiv_remove(struct platform_device *pdev) return 0; } +static const struct of_device_id nop_xceiv_dt_ids[] = { + { .compatible = "usb-nop-xceiv" }, + { } +}; + +MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids); + static struct platform_driver nop_usb_xceiv_driver = { .probe = nop_usb_xceiv_probe, .remove = nop_usb_xceiv_remove, .driver = { .name = "nop_usb_xceiv", .owner = THIS_MODULE, + .of_match_table = of_match_ptr(nop_xceiv_dt_ids), }, }; -- 1.7.4.1 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
