Date:   Thu, 17 May 2018 20:59:40 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     William Breathitt Gray <vilhelm.gray@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        Benjamin Gaignard <benjamin.gaignard@...com>,
        linux-iio@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH v6 6/9] dt-bindings: counter: Document stm32 quadrature encoder

2018-05-17 18:23 GMT+02:00 Rob Herring <robh+dt@...nel.org>:
> On Wed, May 16, 2018 at 12:51 PM, William Breathitt Gray
> <vilhelm.gray@...il.com> wrote:
>> From: Benjamin Gaignard <benjamin.gaignard@...com>
>
> v6? Where's v1-v5?
>
>> Add bindings for STM32 Timer quadrature encoder.
>> It is a sub-node of STM32 Timer which implement the
>> counter part of the hardware.
>>
>> Cc: Rob Herring <robh+dt@...nel.org>
>> Cc: Mark Rutland <mark.rutland@....com>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
>> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
>> ---
>>  .../bindings/counter/stm32-timer-cnt.txt      | 26 +++++++++++++++++++
>>  .../devicetree/bindings/mfd/stm32-timers.txt  |  7 +++++
>>  2 files changed, 33 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/counter/stm32-timer-cnt.txt
>>
>> diff --git a/Documentation/devicetree/bindings/counter/stm32-timer-cnt.txt b/Documentation/devicetree/bindings/counter/stm32-timer-cnt.txt
>> new file mode 100644
>> index 000000000000..377728128bef
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/counter/stm32-timer-cnt.txt
>> @@ -0,0 +1,26 @@
>> +STMicroelectronics STM32 Timer quadrature encoder
>> +
>> +STM32 Timer provides quadrature encoder counter mode to detect
>
> 'mode' does not sound like a sub-block of the timers block.

quadrature encoding is one of the counting modes of this hardware
block which is enable to count on other signals/triggers

>
>> +angular position and direction of rotary elements,
>> +from IN1 and IN2 input signals.
>> +
>> +Must be a sub-node of an STM32 Timer device tree node.
>> +See ../mfd/stm32-timers.txt for details about the parent node.
>> +
>> +Required properties:
>> +- compatible:          Must be "st,stm32-timer-counter".
>> +- pinctrl-names:       Set to "default".
>> +- pinctrl-0:           List of phandles pointing to pin configuration nodes,
>> +                       to set IN1/IN2 pins in mode of operation for Low-Power
>> +                       Timer input on external pin.
>> +
>> +Example:
>> +       timers@...10000  {
>> +               compatible = "st,stm32-timers";
>> +               ...
>> +               counter {
>> +                       compatible = "st,stm32-timer-counter";
>
> Is there only 1? How is the counter addressed?

Yes there is only one counter per hardware block.
Counter is addressed like the two others sub-nodes and the details
about parent mode are describe in stm32-timers.txt
Should I add them here too ? so example will be like that:
timers@...10000  {
  #address-cells = <1>;
  #size-cells = <0>;
  compatible = "st,stm32-timers";
  reg = <0x40010000 0x400>;
  clocks = <&rcc 0 160>;
  clock-names = "int";
  counter {
    compatible = "st,stm32-timer-counter";
    pinctrl-names = "default";
    pinctrl-0 = <&tim1_in_pins>;
    };
 };

Benjamin
>
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