linux-kernel - Re: [PATCH 1/7] pwm: Add pwm core driver

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Message-ID: <040c01cb5f0c$29bcb3b0$LocalHost@wipblrx0099946>
Date:	Tue, 28 Sep 2010 18:23:24 +0530
From:	"Hemanth V" <hemanthv@...com>
To:	"Arun Murthy" <arun.murthy@...ricsson.com>, <lars@...afoo.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	<kernel@...gutronix.de>, <philipp.zabel@...il.com>,
	<robert.jarzmik@...e.fr>, <marek.vasut@...il.com>,
	<eric.y.miao@...il.com>, <rpurdie@...ys.net>,
	<sameo@...ux.intel.com>, <kgene.kim@...sung.com>,
	<linux-omap@...r.kernel.org>
Cc:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-mips@...ux-mips.org>,
	"Arun MURTHY" <arun.murthy@...ricsson.com>,
	<STEricsson_nomadik_linux@...t.st.com>
Subject: Re: [PATCH 1/7] pwm: Add pwm core driver

----- Original Message ----- 
From: "Arun Murthy" <arun.murthy@...ricsson.com>


> The existing pwm based led and backlight driver makes use of the
> pwm(include/linux/pwm.h). So all the board specific pwm drivers will
> be exposing the same set of function name as in include/linux/pwm.h.
> As a result build fails in case of multi soc environments where each soc
> has a pwm device in it.

This seems very specific to ST environment,  looking at the driver list from
( [PATCH 4/7] pwm: Align existing pwm drivers with pwm-core ) it seems
most multi SOC environments might support PWM in either one of the SOC.

arch/arm/plat-mxc/pwm.c
arch/arm/plat-pxa/pwm.c
arch/arm/plat-samsung/pwm.c
arch/mips/jz4740/pwm.c
drivers/mfd/twl6030-pwm.c

Unless people have examples of other SOCs which might use this,
the better approach might be to go for a custom driver rather than changing
the framework.

Thanks
Hemanth 

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