[PATCH 01/13] usb: phy: nop: Add device tree support and binding information

[Felipe Balbi]

Hi,

On Mon, Feb 04, 2013 at 05:58:48PM +0200, Roger Quadros wrote:
> The PHY clock, clock rate, VCC regulator and RESET regulator
> can now be provided via device tree.
> 
> Signed-off-by: Roger Quadros <rogerq at ti.com>
> ---
>  .../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,

asking to remove, but xeiv != xceiv :-)

> +				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);

actually, I would prefer to not create pdata at all. I mean, ideally
pdata would be used to initialize fields in your own structure, so first
move clk_rate to your own private structure, copy pdata's clk_rate value
to that, then you don't need this hackery when using DT.

-- 
balbi
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