linux-kernel - Re: [PATCH v3 0/4] Add support for the Renesas RZ/N1 ADC

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Message-ID: <20251109150846.25c7ae49@jic23-huawei>
Date: Sun, 9 Nov 2025 15:08:46 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: "Herve Codina (Schneider Electric)" <herve.codina@...tlin.com>
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>, David Lechner
 <dlechner@...libre.com>, Nuno Sá <nuno.sa@...log.com>, Andy
 Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Geert
 Uytterhoeven <geert+renesas@...der.be>, Magnus Damm
 <magnus.damm@...il.com>, Liam Girdwood <lgirdwood@...il.com>, Mark Brown
 <broonie@...nel.org>, linux-iio@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Pascal Eberhard <pascal.eberhard@...com>,
 Miquel Raynal <miquel.raynal@...tlin.com>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 0/4] Add support for the Renesas RZ/N1 ADC

On Mon,  3 Nov 2025 15:18:30 +0100
"Herve Codina (Schneider Electric)" <herve.codina@...tlin.com> wrote:

> Hi,
> 
> The Renesas RZ/N1 ADC controller is the ADC controller available in the
> Renesas RZ/N1 SoCs family.
> 
> It can use up to two internal ADC cores (ADC1 and ADC2) those internal
> cores are handled through ADC controller virtual channels.
> 
> Best regards,
> Herve Codina
> 
> Changes v2 -> v3:
> 
Applied 1-2,4 to the togreg branch of iio.git.
A little bit of merge noise due to another Renesas ADC driver being
added recently, but only in Makefile / Kconfig so hopefully I didn't mess
up merging them.


> v2: https://lore.kernel.org/lkml/20251029144644.667561-1-herve.codina@bootlin.com/
> 
>   Patch 1:
>     - Add 'Reviewed-by: Rob Herring'.
> 
>   Patch 2:
>     - Add missing header files.
>     - Use fixed-width values for register definitions.
>     - Split comments and remove a redundant 'else'.
>     - Return the error in the 'switch case' default statement.
>     - Leave a trailing comma in struct iio_info.
>     - Move *_vref_mv to *_vref_mV.
>     - Split the DEFINE_RUNTIME_DEV_PM_OPS().
>     - Update error code handling in rzn1_adc_core_get_regulators().
>     - Pass rzn1_adc in platform_set_drvdata(), update suspend/resume
>       function accordingly.
>     - Add 'Reviewed-by: Nuno Sá'
> 
>   Patches 3 and 4:
>     No change.
> 
> Changes v1 -> v2:
> 
> v1: https://lore.kernel.org/lkml/20251015142816.1274605-1-herve.codina@bootlin.com/
> 
>   Rebase on top of v6.18-rc3 to have commit db82b8dbf5f0 ("PM: runtime:
>   Fix conditional guard definitions")
> 
>   Patch 1:
>     - Remove unneeded 'dependencies' part.
>     - Rename "adc-clk" clock to "adc".
>     - Move 'additionalProperties: false' just before the example.
>     - Use const instead of enum for the "renesas,r9a06g032-adc"
>       compatible string.
>     - Fix the ACD typo.
> 
>   Patch 2:
>     - Fix the ACD typo.
>     - Rename "adc-clk" clock to "adc".
>     - Update included headers and sort them.
>     - Align register definitions at the same column.
>     - Inline the FIELD_GET() instead of having macros.
>     - Introduce RZN1_ADC_NO_CHANNEL
>     - Get Vref voltage value at probe().
>     - Remove the bitmap in rzn1_adc_set_iio_dev_channels().
>     - Use dev_err_probe() in rzn1_adc_set_iio_dev_channels().
>     - Use auto-cleanup variant for PM runtime "resume and get".
>     - Use scoped_guard() for mutex.
>     - Use devm_mutex_init().
>     - Use the fixed "rzn1-adc" string for indio_dev->name.
>     - Use DEFINE_RUNTIME_DEV_PM_OPS().
>     - Fix rzn1_adc_of_match table and remove of_match_ptr().
>     - Add a comment related to decoupling between IIO chans and ADC1 or
>       ADC2 core chans
>     - Update and add several comments related to ADC core usage and the
>       relationship with ADC core regulator presence.
>     - Remove clocks and regulators handling from PM runtime
>       suspend()/remove().
>     - Simplify the driver removing the no more relevant struct
>       rzn1_adc_core.
> 
>   Patch 3:
>     - Rename "adc-clk" clock to "adc".
>     - Add 'Reviewed-by: Wolfram Sang'
> 
>   Patch 4
>     - Removed the linux-iio list
> 
> Herve Codina (Schneider Electric) (4):
>   dt-bindings: iio: adc: Add the Renesas RZ/N1 ADC
>   iio: adc: Add support for the Renesas RZ/N1 ADC
>   ARM: dts: renesas: r9a06g032: Add the ADC device
>   MAINTAINERS: Add the Renesas RZ/N1 ADC driver entry
> 
>  .../bindings/iio/adc/renesas,rzn1-adc.yaml    | 111 ++++
>  MAINTAINERS                                   |   7 +
>  arch/arm/boot/dts/renesas/r9a06g032.dtsi      |  10 +
>  drivers/iio/adc/Kconfig                       |  10 +
>  drivers/iio/adc/Makefile                      |   1 +
>  drivers/iio/adc/rzn1-adc.c                    | 490 ++++++++++++++++++
>  6 files changed, 629 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/renesas,rzn1-adc.yaml
>  create mode 100644 drivers/iio/adc/rzn1-adc.c
>