linux-kernel - Re: [PATCH v5] pwm: add pwm driver for HiSilicon BVT SOCs

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Date:   Thu, 17 Nov 2016 10:32:38 +0800
From:   Jian Yuan <yuanjian12@...ilicon.com>
To:     Vladimir Zapolskiy <vz@...ia.com>, <thierry.reding@...il.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>
CC:     <linux-pwm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <xuejiancheng@...ilicon.com>,
        <kevin.lixu@...ilicon.com>, <jalen.hsu@...ilicon.com>
Subject: Re: [PATCH v5] pwm: add pwm driver for HiSilicon BVT SOCs



On 2016/11/17 7:55, Vladimir Zapolskiy wrote:
> On 11/16/2016 11:50 AM, Jian Yuan wrote:
>> From: yuanjian <yuanjian12@...ilicon.com>
>>
>> Add PWM driver for the PWM controller found on HiSilicon BVT SOCs, like Hi3519V100, Hi3516CV300, etc.
>> The PWM controller is primarily in charge of controlling P-Iris lens.
>>
>> Reviewed-by: Jiancheng Xue <xuejiancheng@...ilicon.com>
>> Signed-off-by: Jian Yuan <yuanjian12@...ilicon.com>
>> ---
>> Change Log:
>> v5:
>> remove the generic compatible string "hisilicon, hibvt-pwm".
>> v4:
>> Add #pwm-cells in the bindings document.
>> v3:
>> fixed issues pointed by thierry.
>> Add PWM compatible string for Hi3519V100.
>> Implement .apply() function which support atomic, instead of .enable()/.disable()/.config().
>> v2:
>> The number of PWMs is change to be probeable based on the compatible string.
>>
>>  .../devicetree/bindings/pwm/pwm-hibvt.txt          |  22 ++
>>  drivers/pwm/Kconfig                                |   9 +
>>  drivers/pwm/Makefile                               |   1 +
>>  drivers/pwm/pwm-hibvt.c                            | 269 +++++++++++++++++++++
>>  4 files changed, 301 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-hibvt.txt
>>  create mode 100644 drivers/pwm/pwm-hibvt.c
>>
>> diff --git a/Documentation/devicetree/bindings/pwm/pwm-hibvt.txt b/Documentation/devicetree/bindings/pwm/pwm-hibvt.txt
>> new file mode 100644
>> index 0000000..fe63950
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pwm/pwm-hibvt.txt
>> @@ -0,0 +1,22 @@
>> +Hisilicon PWM controller
>> +
>> +Required properties:
>> +-compatible: should contain one SoC specific compatible string
>> + The SoC specific strings supported including:
>> +    "hisilicon,hi3516cv300-pwm"
>> +    "hisilicon,hi3519v100-pwm"
>> +- reg: physical base address and length of the controller's registers.
>> +- clocks: phandle and clock specifier of the PWM reference clock.
>> +- resets: phandle and reset specifier for the PWM controller reset.
>> +- #pwm-cells: Should be 2. See pwm.txt in this directory for a description of
> 
> Since the controller has separate polarity control register, and
> the driver handles polarity settings, please test/change #pwm-cells
> set to 3. It is better to do it right now before someone wants
> to change number of cells in future and support polarity specified
> in DTB.
> 
Goog advice. I would add it in next patch v6.
>> +  the cells format.
>> +
>> +Example:
>> +    pwm: pwm@...30000 {
>> +
> 
> Remove empty line above.
> 
Ok.
>> +        compatible = "hisilicon,hi3516cv300-pwm";
>> +        reg = <0x12130000 0x10000>;
>> +        clocks = <&crg_ctrl HI3516CV300_PWM_CLK>;
>> +        resets = <&crg_ctrl 0x38 0>;
>> +        #pwm-cells = <2>;
> 
> After tesing #pwm-cells = <3> don't forget to updated this line.
> 
Got it.
Thanks,
Jian Yuan
>> +    };
> 
> -- 
> With best wishes,
> Vladimir
> 
> .
>