linux-kernel - Re: [PATCH] gpio: stmpe: Add DT support for stmpe gpio

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Message-ID: <CAKohpom7Sqj7BeTFdsg04iGvZz1jnqB=UZTLdRNK7X-0ivknsQ@mail.gmail.com>
Date:	Fri, 23 Nov 2012 16:17:09 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linus.walleij@...aro.org, grant.likely@...retlab.ca,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	spear-devel@...t.st.com,
	Vipul Kumar Samar <vipulkumar.samar@...com>
Subject: Re: [PATCH] gpio: stmpe: Add DT support for stmpe gpio

On 23 November 2012 16:11, Lee Jones <lee.jones@...aro.org> wrote:
>> > +++ b/Documentation/devicetree/bindings/gpio/gpio-stmpe.txt
>> > @@ -0,0 +1,18 @@
>> > +STMPE gpio
>> > +----------
>> > +
>> > +Required properties:
>> > + - compatible: "st,stmpe-gpio"
>
> ... but this is wrong.
>
>> > +Example:
>> > +   stmpe_gpio {
>> > +           compatible = "st,stmpe-gpio";
>> > +           st,norequest-mask = <0x20>;     //gpio 5 can't be used
>> > +   };
>
> As is the example.
>
> So will be the the DT - if you've already written it.

Again, I believe these are required by the code you wrote in mfd-core.c

        if (parent->of_node && cell->of_compatible) {
                for_each_child_of_node(parent->of_node, np) {
                        if (of_device_is_compatible(np, cell->of_compatible)) {
                                pdev->dev.of_node = np;
                                break;
                        }
                }
        }

This matches compatible of child node with compatible of cell. And that's
why you have added that in your keypad mappings as well.

--
viresh
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