linux-kernel - Re: [PATCH 7/8] ARM: dts: stm32: adopt generic iio bindings for adc channels on dhcor-drc

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Date:   Wed, 24 May 2023 17:39:32 +0200
From:   Olivier MOYSAN <olivier.moysan@...s.st.com>
To:     Marek Vasut <marex@...x.de>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC:     <kernel@...electronics.com>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/8] ARM: dts: stm32: adopt generic iio bindings for adc
 channels on dhcor-drc

Hi Marek,

On 5/24/23 15:54, Marek Vasut wrote:
> On 5/24/23 15:39, Olivier Moysan wrote:
>> Use STM32 ADC generic bindings instead of legacy bindings on
>> DHCOR DRC Compact board.
>>
>> The STM32 ADC specific binding to declare channels has been deprecated,
>> hence adopt the generic IIO channels bindings, instead.
>> The STM32MP151 device tree now exposes internal channels using the
>> generic binding. This makes the change mandatory here to avoid a mixed
>> use of legacy and generic binding, which is not supported by the driver.
>>
>> Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
>> ---
>>   .../dts/stm32mp15xx-dhcor-drc-compact.dtsi    | 28 ++++++++++++++++---
>>   1 file changed, 24 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcor-drc-compact.dtsi 
>> b/arch/arm/boot/dts/stm32mp15xx-dhcor-drc-compact.dtsi
>> index 39af79dc654c..92d906bfd5d7 100644
>> --- a/arch/arm/boot/dts/stm32mp15xx-dhcor-drc-compact.dtsi
>> +++ b/arch/arm/boot/dts/stm32mp15xx-dhcor-drc-compact.dtsi
>> @@ -57,15 +57,35 @@ &adc {    /* X11 ADC inputs */
>>       status = "okay";
>>       adc1: adc@0 {
> 
> 
> I sent similar patch recently too:
> 
> [PATCH] ARM: dts: stm32: Update to generic ADC channel binding on DHSOM 
> systems
> 
> But I needed to add #address-cells/#size-cells here and to adc@100, 
> otherwise DTB checker was complaining . Did you run DTB check and was it 
> OK on your side ?

The first patch in this serie adds the #address-cells/#size-cells to the 
  SoC DT. So, there is no need to add them later in the board DT.

I can send a v2 with your patch (after removing the cells properties 
from the patch). Having all the patches in the same serie, will help 
avoiding sequencing problems.

Do you agree with this ?

BRs
Olivier

> 
>> -        st,adc-channels = <0 1 6>;
>> -        st,min-sample-time-nsecs = <5000>;
>>           status = "okay";
>> +        channel@0 {
>> +            reg = <0>;
>> +            st,min-sample-time-ns = <5000>;
>> +        };
>> +        channel@1 {
>> +            reg = <1>;
>> +            st,min-sample-time-ns = <5000>;
>> +        };
>> +        channel@6 {
>> +            reg = <6>;
>> +            st,min-sample-time-ns = <5000>;
>> +        };
>>       };
> 
> [...]