linux-kernel - Re: [PATCH] input: stmpe-ts: Add DT support for stmpe touchscreen

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Message-ID: <20121123120501.GA22268@gmail.com>
Date:	Fri, 23 Nov 2012 12:05:01 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	spear-devel@...t.st.com,
	Vipul Kumar Samar <vipulkumar.samar@...com>
Subject: Re: [PATCH] input: stmpe-ts: Add DT support for stmpe touchscreen

> >> +++ b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> >> @@ -0,0 +1,43 @@
> >> +STMPE Touchscreen
> >> +----------------
> >> +
> >> +Required properties:
> >> + - compatible: "st,stmpe-ts"
> >
> > You shouldn't be specifying a compatible string in the DT.
> >
> >> +Example:
> >> +
> >> +     stmpe_touchscreen {
> >> +             compatible = "st,stmpe-ts";
> >
> > This needs to be removed.
> 
> Copying my earlier reply from stmpe-gpio patch for others to know
> what i have to say on this :)
> 
> 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.

Yes, you're right. Please ignore this comment.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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