linux-kernel - Re: [PATCH v4 2/4] mfd: sony-cronos-smc: Add driver for Sony Cronos SMC

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Message-ID: <406c40be-757b-44d1-b6a1-a5d6d4d07e6f@linaro.org>
Date: Tue, 21 Oct 2025 12:39:52 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Timothy Pearson <tpearson@...torengineering.com>,
 devicetree <devicetree@...r.kernel.org>,
 linux-kernel <linux-kernel@...r.kernel.org>, Rob Herring
 <robh+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Lee Jones <lee@...nel.org>, Georgy Yakovlev <Georgy.Yakovlev@...y.com>
Subject: Re: [PATCH v4 2/4] mfd: sony-cronos-smc: Add driver for Sony Cronos
 SMC

On 20/10/2025 20:14, Timothy Pearson wrote:
> The Sony Cronos Platform Controller is a multi-purpose platform controller
> that provides both a watchdog timer and an LED controller for the Sony
> Interactive Entertainment Cronos x86 server platform. As both functions
> are provided by the same CPLD, a multi-function device is exposed as the
> parent of both functions.
> 
> Signed-off-by: Timothy Pearson <tpearson@...torengineering.com>
> Signed-off-by: Shawn Anastasio <sanastasio@...torengineering.com>

Your threading is completely broken. git format-patch -v4 -4 --cover-letter.

Or just use b4.

https://elixir.bootlin.com/linux/v6.16-rc2/source/Documentation/process/submitting-patches.rst#L830

> ---
>  MAINTAINERS                     |   7 ++
>  drivers/mfd/Kconfig             |  11 ++
>  drivers/mfd/Makefile            |   2 +
>  drivers/mfd/sony-cronos-smc.c   | 212 ++++++++++++++++++++++++++++++++
>  include/linux/mfd/sony-cronos.h |  61 +++++++++
>  5 files changed, 293 insertions(+)
>  create mode 100644 drivers/mfd/sony-cronos-smc.c
>  create mode 100644 include/linux/mfd/sony-cronos.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 545a4776795e..8570b12a3f66 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -23881,6 +23881,13 @@ S:	Maintained
>  F:	drivers/ssb/
>  F:	include/linux/ssb/
>  
> +SONY CRONOS SMC DRIVER
> +M:	Georgy Yakovlev <Georgy.Yakovlev@...y.com>
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/mfd/sony,cronos-smc.yaml
> +F:	drivers/mfd/sony-cronos-smc.c
> +F:	include/linux/mfd/sony-cronos.h
> +
>  SONY IMX208 SENSOR DRIVER
>  M:	Sakari Ailus <sakari.ailus@...ux.intel.com>
>  L:	linux-media@...r.kernel.org
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 6cec1858947b..1b08f5ae648d 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -2382,6 +2382,17 @@ config MFD_QCOM_PM8008
>  	  under it in the device tree. Additional drivers must be enabled in
>  	  order to use the functionality of the device.
>  
> +config MFD_SONY_CRONOS_SMC
> +	tristate "Sony Cronos System Management Controller"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	depends on I2C && OF
> +	help
> +      Support for the Sony Cronos system controller. Additional drivers must
> +      be enabled in order to use the functionality of the device, including LED
> +      control and the system watchdog. The controller itself is a custom design
> +      tailored to the specific needs of the Sony Cronos hardware platform.
> +
>  menu "Multimedia Capabilities Port drivers"
>  	depends on ARCH_SA1100
>  
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 865e9f12faff..99700f423fe7 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -300,6 +300,8 @@ obj-$(CONFIG_MFD_QNAP_MCU)	+= qnap-mcu.o
>  obj-$(CONFIG_MFD_RSMU_I2C)	+= rsmu_i2c.o rsmu_core.o
>  obj-$(CONFIG_MFD_RSMU_SPI)	+= rsmu_spi.o rsmu_core.o
>  
> +obj-$(CONFIG_MFD_SONY_CRONOS_SMC)	+= sony-cronos-smc.o
> +
>  obj-$(CONFIG_MFD_UPBOARD_FPGA)	+= upboard-fpga.o
>  
>  obj-$(CONFIG_MFD_LOONGSON_SE)	+= loongson-se.o
> diff --git a/drivers/mfd/sony-cronos-smc.c b/drivers/mfd/sony-cronos-smc.c
> new file mode 100644
> index 000000000000..9d9b5402f89b
> --- /dev/null
> +++ b/drivers/mfd/sony-cronos-smc.c
> @@ -0,0 +1,212 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Device driver for Sony Cronos SMCs
> + * Copyright (C) 2015-2017  Dialog Semiconductor
> + * Copyright (C) 2022-2025  Raptor Engineering, LLC
> + */
> +
> +#include <linux/device.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/sony-cronos.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +static const struct mfd_cell cronos_smc_devs[] = {
> +	{
> +		.name = "cronos-watchdog",
> +		.of_compatible = "sony,cronos-watchdog",

Undocumented compatible drop.

Best regards,
Krzysztof