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Date:	Wed, 6 Aug 2014 19:16:51 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	caesar <caesar.wang@...k-chips.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Heiko Stübner <heiko@...ech.de>,
	b.galvani@...il.com, Rob Herring <robh+dt@...nel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Randy Dunlap <rdunlap@...radead.org>,
	Kumar Gala <galak@...eaurora.org>,
	Eddie Cai <cf@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	Jianqun Xu <xjq@...k-chips.com>,
	Addy Ke <addy.ke@...k-chips.com>,
	陈渐飞 <cjf@...k-chips.com>,
	han jiang <hj@...k-chips.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-pwm <linux-pwm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] pwm: rockchip: Added to support for RK3288 SoC

Caesar,

On Wed, Aug 6, 2014 at 6:27 PM, caesar <caesar.wang@...k-chips.com> wrote:
> Doug,
>
> 在 2014年08月07日 06:46, Doug Anderson 写道:
>
>> Caesar,
>>
>> On Thu, Jul 24, 2014 at 3:21 AM, Caesar Wang <caesar.wang@...k-chips.com>
>> wrote:
>>>
>>> +static const struct rockchip_pwm_data pwm_data_v1 = {
>>> +       .regs.duty = PWM_HRC,
>>> +       .regs.period = PWM_LRC,
>>> +       .regs.cntr = PWM_CNTR,
>>> +       .regs.ctrl = PWM_CTRL,
>>> +       .prescaler = PRESCALER,
>>> +       .set_enable = rockchip_pwm_set_enable_v1,
>>> +};
>>> +
>>> +static const struct rockchip_pwm_data pwm_data_v2 = {
>>> +       .regs.duty = PWM_LRC,
>>> +       .regs.period = PWM_HRC,
>>> +       .regs.cntr = PWM_CNTR,
>>> +       .regs.ctrl = PWM_CTRL,
>>> +       .prescaler = PRESCALER-1,
>>> +       .set_enable = rockchip_pwm_set_enable_v2,
>>> +};
>>> +
>>> +static const struct rockchip_pwm_data pwm_data_vop = {
>>> +       .regs.duty = PWM_LRC,
>>> +       .regs.period = PWM_HRC,
>>> +       .regs.cntr = PWM_CTRL,
>>> +       .regs.ctrl = PWM_CNTR,
>>
>> Did you really mean to flip CTRL and CNTR here?  If so, that's super
>> confusing and deserves a comment.  AKA, I think the above should not
>> be:
>>
>>   +       .regs.cntr = PWM_CTRL,
>>   +       .regs.ctrl = PWM_CNTR,
>>
>> ...but should be
>>
>>   +       .regs.cntr = PWM_CNTR,
>>   +       .regs.ctrl = PWM_CTRL,
>>
>> If you didn't mean to flip CTRL and CNTR here, then just get rid of
>> pwm_data_vop and refer to pwm_data_v2.  In fact, I'd suggest that you
>> totally remove the "rockchip,vop-pwm" since there's nothing different
>> between "rockchip,rk3288-pwm" and "rockchip,vop-pwm".
>
>
> Sorry,I think it's no problem. the  "rockchip,rk3288-pwm" and
> "rockchip,vop-pwm" are seperate PWM controllers.
> They are just different registers address between CNTR and CTRL .

OK, I looked up in the TRM.  Right, the CNTR and CTRL are flipped on
the vop.  So I think that the only change you need is to add:

#define PWM_VOP_CTRL  0x00
#define PWM_VOP_CNTR  0x0c

...then use these new #defines for the vop structure.


As you have the code written right now it's very confusing.  The new
#defines will fix this.


>> Have you validated Thierry's suggestion to allow you to access your
>> memory range?
>
> Yes,we have solve it in lcdc driver.
> The Mark Yao have the  submission in [0].
>
> [0]: https://lkml.org/lkml/2014/8/4/20

Excellent!  Then we should be able to land after you fix the above.

-Doug
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