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

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Date:   Thu, 17 Nov 2016 01:55:49 +0200
From:   Vladimir Zapolskiy <vz@...ia.com>
To:     Jian Yuan <yuanjian12@...ilicon.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 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.

> +  the cells format.
> +
> +Example:
> +	pwm: pwm@...30000 {
> +

Remove empty line above.

> +		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.

> +	};

--
With best wishes,
Vladimir