linux-kernel - Re: [PATCH v4 2/2] pwm: rockchip: Added to support for RK3288 SoC

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Date:	Thu, 07 Aug 2014 12:05:34 +0800
From:	caesar <caesar.wang@...k-chips.com>
To:	Doug Anderson <dianders@...omium.org>
CC:	Thierry Reding <thierry.reding@...il.com>,
	Heiko Stübner <heiko@...ech.de>,
	Beniamino Galvani <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

Doug,
在 2014年08月07日 11:46, Doug Anderson 写道:
> Caesar,
>
> On Wed, Aug 6, 2014 at 8:37 PM, caesar <caesar.wang@...k-chips.com> wrote:
>> Doug,
>>
>> 在 2014年08月07日 11:26, Doug Anderson 写道:
>>
>>> caesar,
>>>
>>> On Wed, Aug 6, 2014 at 8:23 PM, caesar <caesar.wang@...k-chips.com> wrote:
>>>> 在 2014年08月07日 10:16, Doug Anderson 写道:
>>>>
>>>>> 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.
>>>>>
>>>> yeah, I think they can be used in the same context.
>>>>
>>>> I will fix it in patch v5 if it is really need.
>>> I think you should fix this, but if Thierry doesn't think so then it's
>>> really his decision.
>> I remember In patch v2 [1],Thierry suggests me to fix it so if I have no to
>> get wrong.
>>
>> [1]: https://lkml.org/lkml/2014/7/21/113
> I think Thierry might not have realized that they were flipped...
>
> -Doug
>
>
>
Maybe you are right.
I will sent patch v5 fix the about tomorrow if it has no other problems.


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