linux-kernel - Re: [PATCH 06/10] ARM: dts: stm32: adopt generic iio bindings for adc channels on avenger96

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Date:   Thu, 12 Jan 2023 15:28:20 +0100
From:   Marek Vasut <marex@...x.de>
To:     Olivier Moysan <olivier.moysan@...s.st.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.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 06/10] ARM: dts: stm32: adopt generic iio bindings for adc
 channels on avenger96

On 1/12/23 11:44, Olivier Moysan wrote:
> Use STM32 ADC generic bindings instead of legacy bindings on
> Avenger96 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>
> ---
>   .../boot/dts/stm32mp15xx-dhcor-avenger96.dtsi | 28 ++++++++++++++++---
>   1 file changed, 24 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcor-avenger96.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcor-avenger96.dtsi
> index 50af4a27d6be..62efb550ae64 100644
> --- a/arch/arm/boot/dts/stm32mp15xx-dhcor-avenger96.dtsi
> +++ b/arch/arm/boot/dts/stm32mp15xx-dhcor-avenger96.dtsi
> @@ -113,15 +113,35 @@ &adc {
>   	status = "okay";
>   
>   	adc1: adc@0 {
> -		st,adc-channels = <0 1 6>;
> -		st,min-sample-time-nsecs = <5000>;

U-Boot drivers/adc/stm32-adc.c depends on these properties , so if you 
drop them here and U-Boot DTs gets synced with Linux, the ADC driver 
there will start failing. Can you update the U-Boot ADC driver too ?

Maybe the easiest way would be to retain the old properties for now with 
a comment, and add the new properties ?