linux-kernel - Re: [PATCH 4/4] dt-bindings: mfd: Convert stm32 timers bindings to json-schema

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Message-ID: <41c43d09-9371-8b23-a3dd-e43f5df5c5bc@st.com>
Date:   Wed, 6 Nov 2019 19:57:06 +0000
From:   Benjamin GAIGNARD <benjamin.gaignard@...com>
To:     Rob Herring <robh@...nel.org>
CC:     "mark.rutland@....com" <mark.rutland@....com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Fabrice GASNIER <fabrice.gasnier@...com>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "knaack.h@....de" <knaack.h@....de>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>
Subject: Re: [PATCH 4/4] dt-bindings: mfd: Convert stm32 timers bindings to
 json-schema


On 11/6/19 5:15 AM, Rob Herring wrote:
> On Thu, Oct 31, 2019 at 01:30:40PM +0100, Benjamin Gaignard wrote:
>> Convert the STM32 timers binding to DT schema format using json-schema
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
>> ---
>>   .../devicetree/bindings/mfd/st,stm32-timers.yaml   | 91 ++++++++++++++++++++++
>>   .../devicetree/bindings/mfd/stm32-timers.txt       | 73 -----------------
>>   2 files changed, 91 insertions(+), 73 deletions(-)
>>   create mode 100644 Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
>>   delete mode 100644 Documentation/devicetree/bindings/mfd/stm32-timers.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml b/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
>> new file mode 100644
>> index 000000000000..3f0a65fb2bc0
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
>> @@ -0,0 +1,91 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/mfd/st,stm32-timers.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: STMicroelectronics STM32 Timers bindings
>> +
>> +description: |
>> +  This hardware block provides 3 types of timer along with PWM functionality: \
> Don't need the \
ok
>
>> +    - advanced-control timers consist of a 16-bit auto-reload counter driven by a programmable \
>> +      prescaler, break input feature, PWM outputs and complementary PWM ouputs channels. \
>> +    - general-purpose timers consist of a 16-bit or 32-bit auto-reload counter driven by a \
>> +      programmable prescaler and PWM outputs.\
>> +    - basic timers consist of a 16-bit auto-reload counter driven by a programmable prescaler.
>> +
>> +maintainers:
>> +  - Benjamin Gaignard <benjamin.gaignard@...com>
>> +  - Fabrice Gasnier <fabrice.gasnier@...com>
>> +
>> +allOf:
>> +  - $ref: "../pwm/st,stm32-pwm.yaml#"
>> +  - $ref: "../iio/timer/st,stm32-timer-trigger.yaml#"
>> +  - $ref: "../counter/st,stm32-timer-cnt.yaml#"
> This works, but I prefer the child node names be listed under properties
> here with a ref:
>
> counter:
>    $ref: "../counter/st,stm32-timer-cnt.yaml#"
If I wrote everything in one file I guess what won't be needed anymore
>
>> +
>> +properties:
>> +  compatible:
>> +    const: st,stm32-timers
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +  clock-names:
>> +    items:
>> +      - const: int
>> +
>> +  reset:
>> +    maxItems: 1
>> +
>> +  dmas: true
> How many?

from 0 up to 8, but I don't know the syntax for that. minItems = 0 isn't 
accepted.

Any hints for me ?

>
>> +
>> +  dma-names: true
> What are the names?

it could be ch1 ... ch8, "trig" or "up" in any order.

Again I haven't be able to find a syntax that allow to list the names 
and use them in any orders.

Benjamin

>
>> +
>> +  "#address-cells":
>> +    const: 1
>> +
>> +  "#size-cells":
>> +    const: 0
>> +
>> +required:
>> +  - "#address-cells"
>> +  - "#size-cells"
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - clock-names
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/stm32mp1-clks.h>
>> +    timers2: timer@...00000 {
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +      compatible = "st,stm32-timers";
>> +      reg = <0x40000000 0x400>;
>> +      clocks = <&rcc TIM2_K>;
>> +      clock-names = "int";
>> +      dmas = <&dmamux1 18 0x400 0x1>,
>> +             <&dmamux1 19 0x400 0x1>,
>> +             <&dmamux1 20 0x400 0x1>,
>> +             <&dmamux1 21 0x400 0x1>,
>> +             <&dmamux1 22 0x400 0x1>;
>> +      dma-names = "ch1", "ch2", "ch3", "ch4", "up";
>> +      pwm {
>> +        compatible = "st,stm32-pwm";
>> +        #pwm-cells = <3>;
>> +        st,breakinput = <0 1 5>;
>> +      };
>> +      timer@0 {
>> +        compatible = "st,stm32-timer-trigger";
>> +        reg = <0>;
>> +      };
>> +      counter {
>> +        compatible = "st,stm32-timer-counter";
>> +      };
>> +    };
>> +
>> +...