linux-kernel - Re: [PATCH v4] pwm: add pwm driver for HiSilicon BVT SOCs

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Date:   Fri, 28 Oct 2016 10:48:08 +0800
From:   Jian Yuan <yuanjian12@...ilicon.com>
To:     Rob Herring <robh@...nel.org>
CC:     <thierry.reding@...il.com>, <mark.rutland@....com>,
        <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 v4] pwm: add pwm driver for HiSilicon BVT SOCs



On 2016/10/11 5:53, Rob Herring wrote:
> On Mon, Oct 10, 2016 at 07:05:16PM +0800, 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:
>> 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          |  23 ++
>>  drivers/pwm/Kconfig                                |   9 +
>>  drivers/pwm/Makefile                               |   1 +
>>  drivers/pwm/pwm-hibvt.c                            | 270 +++++++++++++++++++++
>>  4 files changed, 303 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..609284f
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pwm/pwm-hibvt.txt
>> @@ -0,0 +1,23 @@
>> +Hisilicon PWM controller
>> +
>> +Required properties:
>> +-compatible: should contain one SoC specific compatible string and one generic compatible
>> +string "hisilicon, hibvt-pwm". The SoC specific strings supported including:
> 
> Extra space          ^
> 
> With that, for the binding:
> 
> Acked-by: Rob Herring <robh@...nel.org>
> 

Hi, Rob, I am ready to remove the generic compatible string, because I think it's not useful and it would affect the driver on probe when only a generic compatible string existed.
changed as follows:
	pwm: pwm@...30000 {
		compatible = "hisilicon,hi3516cv300-pwm";
		reg = <0x12130000 0x10000>;
		clocks = <&crg_ctrl HI3516CV300_PWM_CLK>;
		resets = <&crg_ctrl 0x38 0>;
		#pwm-cells = <2>;
	};
Is that ok?

Jian Yuan.

>> +	"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
>> +  the cells format.
>> +
>> +Example:
>> +	pwm: pwm@...30000 {
>> +
>> +		compatible = "hisilicon,hi3516cv300-pwm", "hisilicon,hibvt-pwm";
>> +		compatible = "hisilicon,hi3519v100-pwm", "hisilicon,hibvt-pwm";
>> +		reg = <0x12130000 0x10000>;
>> +		clocks = <&crg_ctrl HI3516CV300_PWM_CLK>;
>> +		resets = <&crg_ctrl 0x38 0>;
>> +		#pwm-cells = <2>;
>> +	};
> 
> .
>