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

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Date:	Sun, 27 Jul 2014 21:01:20 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	caesar <caesar.wang@...k-chips.com>
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

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?  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
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