linux-kernel - Re: [PATCH v2 2/2] pwm: add this patch to support the new pwm of Rockchip SoCs

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Message-ID: <53D631B6.1050603@rock-chips.com>
Date:	Mon, 28 Jul 2014 19:19:18 +0800
From:	caesar <caesar.wang@...k-chips.com>
To:	Doug Anderson <dianders@...omium.org>
CC:	Thierry Reding <thierry.reding@...il.com>,
	linux-pwm@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] pwm: add this patch to support the new pwm of
 Rockchip SoCs

Doug,
在 2014年07月28日 12:01, Doug Anderson 写道:
> Caesar,
>
> On Sun, Jul 27, 2014 at 7:00 AM, caesar <caesar.wang@...k-chips.com> wrote:
>> /*I think will be show the faill log:->
>>
>> * rockchip-pwm ff9301a0.pwm: can't request region for resource [mem
>> 0xff9301a0-0xff93019f]
>> */
>>
>> pc->base = devm_ioremap_resource(dev, regs);
> Did you actually code this up and try it and get this error?
Yeah.
> I hadn't
> tried it but I researched other dts files and it looked as if there
> was one example that was doing this.  ...but perhaps it wasn't
> actually doing the ioremap_resource on both ranges.
>
> I'd imagine that this is _probably_ equivalent to what Thierry was
> suggesting, so if it didn't work then maybe Thierry's won't work
> either?
>
> I don't have any other great suggestions other than doing two memory
> ranges for lcdc:
>
>           lcdc@...30000 {
>                   compatible = "rockchip,rk3288-lcdc";
>                   reg = <0xff930000 0x1a0>, <0xff9301b0 0xfe50>;
>                   ...
>           };
>           pwm@...301a0 {
>                   compatible = "rockchip,vop-pwm";
>                   reg = <0xff9301a0 0x10>;
>                   ...
>           };
>
> ...but I am certainly nowhere near an expert on this stuff...
>
> -Doug
>
>
>
I has solve in lcdc driver,but I always feel awkward. I think a good way 
to solve in pwm driver.
Unfortunately that  so far ,I have not a good idle in pwm driver.

Maybe,I  let do it that way in lcdc driver.


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