Am 07.10.2015 um 04:26 schrieb Stephen Warren:
> On 10/06/2015 03:53 PM, Eric Anholt wrote:
>> Stefan Wahren <stefan.wahren@xxxxxxxx> writes:
>>
>>> This patch adds a label for uart0 to allow changing of uart0
>>> pins.
>>>
>>> Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
>> This patch seems innocuous, but could you clarify for me how
>> exactly you change the uart0 pins, and why one would do that?
> I /assume/ this is so that some other DT file (that includes the
> edited file) can add some pinctrl-related properties to this DT node,
> using syntax such as:
>
> &uart0 {
> new content;
> };
>
> If so, the patch,
> Acked-by: Stephen Warren <swarren@xxxxxxxxxxxxx>
Your assumption is correct. In case the UART should be used on a custom
board with Raspberry Pi Compute Module and a microcontroller this change
is necessary to reference the UART:
&gpio {
// ...
uart0_pins: uart0_pins {
brcm,pins = <36 37>;
brcm,function = <BCM2835_FSEL_ALT2>;
};
}
&uart0 {
pinctrl-names = "default";
pinctrl-0 = <&uart0_pins>;
status = "okay";
};
Thanks
Stefan
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