linux-kernel - Re: [PATCH v2 10/16] pwm: Add PWM modes

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Date:   Mon, 22 Jan 2018 10:54:07 +0200
From:   Claudiu Beznea <Claudiu.Beznea@...rochip.com>
To:     Rob Herring <robh@...nel.org>
CC:     <thierry.reding@...il.com>, <mark.rutland@....com>,
        <linux@...linux.org.uk>, <daniel@...que.org>,
        <haojian.zhuang@...il.com>, <robert.jarzmik@...e.fr>,
        <corbet@....net>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...e-electrons.com>,
        <linux-pwm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>,
        <linux-rpi-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 10/16] pwm: Add PWM modes



On 20.01.2018 00:34, Rob Herring wrote:
> On Fri, Jan 12, 2018 at 04:22:57PM +0200, Claudiu Beznea wrote:
>> Define a macros for PWM modes to be used by device tree sources.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>> ---
>>  include/dt-bindings/pwm/pwm.h | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/include/dt-bindings/pwm/pwm.h b/include/dt-bindings/pwm/pwm.h
>> index ab9a077e3c7d..b8617431f8ec 100644
>> --- a/include/dt-bindings/pwm/pwm.h
>> +++ b/include/dt-bindings/pwm/pwm.h
>> @@ -12,4 +12,7 @@
>>  
>>  #define PWM_POLARITY_INVERTED			(1 << 0)
>>  
>> +#define PWM_DTMODE_NORMAL			(1 << 0)
> 
> Bit 0 is already taken. I think you mean (0 << 1)?
I wanted to have the PWM modes in a new cell, so that the pwms binding to be
something like:
pwms=<pwm-controller pwm-channel pwm-period pwm-flags pwm-mode>

If you think it is mode feasible to also include PWM mode in the cell for 
PWM flags, please let me know.

> 
> Personally, I'd just drop this define. A define for a 0 value makes more 
> sense when each state is equally used (like active high or low), but if 
> 0 is the more common case, then I don't the need for a define.
I want it to have these defines like bit defines:
PWM_DTMODE_NORMAL=0x1
PWM_DTMODE_COMPLEMENTARY=0x2
PWM_DTMODE_PUSH_PULL=0x4

Thank you,
Claudiu Beznea

> 
>> +#define PWM_DTMODE_COMPLEMENTARY		(1 << 1)
>> +
>>  #endif
>> -- 
>> 2.7.4
>>
>