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

[mkl@pengutronix.de (Marc Kleine-Budde)]

On 03/08/2013 11:46 AM, Marc Kleine-Budde wrote:
> On 02/04/2013 04:58 PM, 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@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>;
> 
> Why do you hardcode the clock frequency here? You should use
> clk_get_rate() to get the frequency from the clock tree.

What about declaring a "fixed-clock" node in the device tree? Then it
should be possible to keep the driver free of any omap specific code.

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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