On 08/26/2013 12:45 PM, boris brezillon wrote:
> Hello Jean-Christophe,
>
> Le 26/08/2013 19:53, Jean-Christophe PLAGNIOL-VILLARD a écrit :
>> On 23:37 Sat 24 Aug , Boris BREZILLON wrote:
>>> Add support for generic pin configuration to pinctrl-at91 driver.
...
>>> a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
...
>>> configures various pad settings
>>> such as pull-up, multi drive, etc.
>>> Required properties for iomux controller:
>>> -- compatible: "atmel,at91rm9200-pinctrl"
>>> +- compatible: "atmel,at91rm9200-pinctrl" or "atmel,at91sam9x5-pinctrl".
>>> + Add "generic-pinconf" to the compatible string list to use the
>>> generic pin
...
>>> +pinctrl@fffff400 {
>>> + #address-cells = <1>;
>>> + #size-cells = <1>;
>>> + ranges;
>>> + compatible = "atmel,at91rm9200-pinctrl", "generic-pinconf",
>>> "simple-bus";
>> nack your break the backword compatibility
>>
>> if we use a old kernel with this new dt nothing will work
>> as the old kernel will never known the the "generic-pinconf" means
>> anything
>
> Your're right, I didn't think of this case (old kernel with new dt).
Well, just to be clear: If a new DT uses a new compatible value of any
kind, be it adding "generic-pinconf" or switching to "foo-yyy" rather
than "foo-yyy", it won't be compatible... That somewhat implies that you
can't ever replace an old binding with something new.
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