linux-kernel - Re: [PATCH v2 1/2] dt-bindings: pwm: sprd: Add Spreadtrum PWM documentation

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Message-ID: <20190813141256.jnbrfld42rtigek3@pengutronix.de>
Date:   Tue, 13 Aug 2019 16:12:56 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     thierry.reding@...il.com, robh+dt@...nel.org, mark.rutland@....com,
        orsonzhai@...il.com, zhang.lyra@...il.com,
        vincent.guittot@...aro.org, linux-pwm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: pwm: sprd: Add Spreadtrum PWM
 documentation

On Tue, Aug 13, 2019 at 09:46:40PM +0800, Baolin Wang wrote:
> Add Spreadtrum PWM controller documentation.
> 
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
> Changes from v1:
>  - Use assigned-clock-parents and assigned-clocks to set PWM clock parent.
> ---
>  Documentation/devicetree/bindings/pwm/pwm-sprd.txt |   38 ++++++++++++++++++++
>  1 file changed, 38 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sprd.txt
> 
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-sprd.txt b/Documentation/devicetree/bindings/pwm/pwm-sprd.txt
> new file mode 100644
> index 0000000..e6cf312
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-sprd.txt
> @@ -0,0 +1,38 @@
> +Spreadtrum PWM controller
> +
> +Spreadtrum SoCs PWM controller provides 4 PWM channels.
> +
> +Required porperties:

s/porperties/properties/

> +- compatible : Should be "sprd,ums512-pwm".
> +- reg: Physical base address and length of the controller's registers.
> +- clocks: The phandle and specifier referencing the controller's clocks.
> +- clock-names: Should contain following entries:
> +  "pwmn": used to derive the functional clock for PWM channel n (n range: 0 ~ 3).
> +  "enablen": for PWM channel n enable clock (n range: 0 ~ 3).
> +- assigned-clocks: Reference to the PWM clock entroes.

s/entroes/entries/

> +- assigned-clock-parents: The phandle of the parent clock of PWM clock.

I'm not sure you need to point out assigned-clocks and
assigned-clock-parents as this is general clk stuff. Also I wonder if
these should be "required properties".

> +- #pwm-cells: Should be 2. See pwm.txt in this directory for a description of
> +  the cells format.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |