linux-kernel - Re: [PATCH v5 1/7] MFD: add bindings for STM32 General Purpose Timer driver

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Date:   Fri, 9 Dec 2016 13:40:16 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     robh+dt@...nel.org, Mark Rutland <mark.rutland@....com>,
        alexandre.torgue@...com, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-pwm@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
        knaack.h@....de, Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        Gerald Baeza <gerald.baeza@...com>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [PATCH v5 1/7] MFD: add bindings for STM32 General Purpose Timer driver

2016-12-09 9:53 GMT+01:00 Lee Jones <lee.jones@...aro.org>:
> Sorry to do this Ben.  Not much to do now though!
>
>> Add bindings information for STM32 General Purpose Timer
>>
>> version 2:
>> - rename stm32-mfd-timer to stm32-gptimer
>> - only keep one compatible string
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
>> ---
>>  .../bindings/mfd/stm32-general-purpose-timer.txt   | 39 ++++++++++++++++++++++
>>  1 file changed, 39 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/mfd/stm32-general-purpose-timer.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/stm32-general-purpose-timer.txt b/Documentation/devicetree/bindings/mfd/stm32-general-purpose-timer.txt
>> new file mode 100644
>> index 0000000..ce67755
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mfd/stm32-general-purpose-timer.txt
>> @@ -0,0 +1,39 @@
>> +STM32 General Purpose Timer driver bindings
>
> This is a great place to describe what we're *actually* trying to
> achieve with this driver, and the worst place to use the term "general
> purpose", since this IP is so much more than that.
>
>
> "STM32 Timers
>
> This IP provides 3 types of timer along with PWM functionality.
>
> [...]"
>
> ... then go on to explain what the 3 types are and how they can be
> used.
>
>> +Required parameters:
>> +- compatible: must be "st,stm32-gptimer"
>
> I vehemently disagree that this entire IP is a GP Timer.  It contains
> GP timers, sure, but it also contains Advanced and Basic timers.
>
> IMHO this compatible should be "st,stm32-timers".
>
> And the file name of both this and the *.c file should reflect that
> too.

I will do those name changes in v6.

>
> Remainder looks nice.
>
>> +- reg:                       Physical base address and length of the controller's
>> +                     registers.
>> +- clock-names:               Set to "clk_int".
>> +- clocks:            Phandle to the clock used by the timer module.
>> +                     For Clk properties, please refer to ../clock/clock-bindings.txt
>> +
>> +Optional parameters:
>> +- resets:            Phandle to the parent reset controller.
>> +                     See ../reset/st,stm32-rcc.txt
>> +
>> +Optional subnodes:
>> +- pwm:                       See ../pwm/pwm-stm32.txt
>> +- timer:             See ../iio/timer/stm32-timer-trigger.txt
>> +
>> +Example:
>> +     timers@...10000 {
>> +             #address-cells = <1>;
>> +             #size-cells = <0>;
>> +             compatible = "st,stm32-gptimer";
>> +             reg = <0x40010000 0x400>;
>> +             clocks = <&rcc 0 160>;
>> +             clock-names = "clk_int";
>> +
>> +             pwm@0 {
>
> Out of interest, do you use the "@0", "@1" for anything now?

No I don't use them so I will remove them in v6

>
>> +                     compatible = "st,stm32-pwm";
>> +                     pinctrl-0       = <&pwm1_pins>;
>> +                     pinctrl-names   = "default";
>> +             };
>> +
>> +             timer@0 {
>> +                     compatible = "st,stm32-timer-trigger";
>> +                     reg = <0>;
>> +             };
>> +     };
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog



-- 
Benjamin Gaignard

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