linux-kernel - Re: [PATCH v2 1/8] dt-bindings: mfd: Add STM32 LPTimer binding

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Date:   Thu, 29 Jun 2017 09:17:56 +0200
From:   Fabrice Gasnier <fabrice.gasnier@...com>
To:     Rob Herring <robh@...nel.org>
CC:     <lee.jones@...aro.org>, <benjamin.gaignard@...aro.org>,
        <jic23@...nel.org>, <thierry.reding@...il.com>,
        <mark.rutland@....com>, <alexandre.torgue@...com>,
        <mcoquelin.stm32@...il.com>, <benjamin.gaignard@...com>,
        <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-pwm@...r.kernel.org>
Subject: Re: [PATCH v2 1/8] dt-bindings: mfd: Add STM32 LPTimer binding

On 06/28/2017 06:44 PM, Rob Herring wrote:
> On Tue, Jun 27, 2017 at 10:57:32AM +0200, Fabrice Gasnier wrote:
>> On 06/26/2017 08:07 PM, Rob Herring wrote:
>>> On Wed, Jun 21, 2017 at 04:30:08PM +0200, Fabrice Gasnier wrote:
>>>> Add documentation for STMicroelectronics STM32 Low-Power Timer binding.
>>>>
>>>> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
>>>> ---
>>>> Changes in v2:
>>>> - Lee's comments: s/Low Power/Low-Power/, remove 0x in example, improve
>>>>   properties descriptions
>>>> ---
>>>>  .../devicetree/bindings/mfd/stm32-lptimer.txt      | 48 ++++++++++++++++++++++
>>>>  1 file changed, 48 insertions(+)
>>>>  create mode 100644 Documentation/devicetree/bindings/mfd/stm32-lptimer.txt
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/mfd/stm32-lptimer.txt b/Documentation/devicetree/bindings/mfd/stm32-lptimer.txt
>>>> new file mode 100644
>>>> index 0000000..af859c8
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/mfd/stm32-lptimer.txt
>>>> @@ -0,0 +1,48 @@
>>>> +STMicroelectronics STM32 Low-Power Timer
>>>> +
>>>> +The STM32 Low-Power Timer (LPTIM) is a 16-bit timer that provides several
>>>> +functions:
>>>> +- PWM output (with programmable prescaler, configurable polarity)
>>>> +- Quadrature encoder, counter
>>>> +- Trigger source for STM32 ADC/DAC (LPTIM_OUT)
>>>> +
>>>> +Required properties:
>>>> +- compatible:		Must be "st,stm32-lptimer".
>>>> +- reg:			Offset and length of the device's register set.
>>>> +- clocks:		Phandle to the clock used by the LP Timer module.
>>>> +- clock-names:		Must be "mux".
>>>> +- #address-cells:	Should be '<1>'.
>>>> +- #size-cells:		Should be '<0>'.
>>>> +
>>>> +Optional subnodes:
>>>> +- pwm:			See ../pwm/pwm-stm32-lp.txt
>>>> +- counter:		See ../iio/timer/stm32-lptimer-cnt.txt
>>>> +- trigger:		See ../iio/timer/stm32-lptimer-trigger.txt
>>>> +
>>>> +Example:
>>>> +
>>>> +	lptimer1: lptimer@...02400 {
>>>
>>> timer@...
>>
>> Hi Rob,
>>
>> I initially put "lptimer" here to distinguish Low-Power Timer hardware
>> from other "timers" hardware that can be found also on stm32 devices.
>> I'd prefer to keep it, is it sensible from your point of view ?
>> Please advise.
> 
> Node names are supposed to be the class of device (e.g. ethernet, 
> serial, etc.), not the specific device. The compatible is what 
> distinguishes it from other timers.

Hi Rob,

Thanks for your answer. I'll update this in v3.

> 
>>>> +		compatible = "st,stm32-lptimer";
>>>> +		reg = <0x40002400 0x400>;
>>>> +		clocks = <&timer_clk>;
>>>> +		clock-names = "mux";
>>>> +		#address-cells = <1>;
>>>> +		#size-cells = <0>;
>>>> +
>>>> +		pwm {
>>>> +			compatible = "st,stm32-pwm-lp";
>>>> +			pinctrl-names = "default";
>>>> +			pinctrl-0 = <&lppwm1_pins>;
>>>> +		};
>>>> +
>>>> +		trigger@0 {
>>>> +			compatible = "st,stm32-lptimer-trigger";
>>>> +			reg = <0>;
>>>
>>> Is there more than 1? 
>>
>> reg identifies trigger hardware block.
> 
> Okay, the trigger patch needs to be reworded.
> 
I'll update this in v3.

Best Regards,
Fabrice
> Rob
>