Re: [PATCH v6 2/5] mfd: sy7636a: Initial commit

From: Lee Jones <lee.jones@linaro.org>
To: Alistair Francis <alistair@alistair23.me>
Cc: robh+dt@kernel.org, lgirdwood@gmail.com, broonie@kernel.org,
	linux-imx@nxp.com, kernel@pengutronix.de,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	alistair23@gmail.com
Subject: Re: [PATCH v6 2/5] mfd: sy7636a: Initial commit
Date: Wed, 16 Jun 2021 11:56:45 +0100	[thread overview]
Message-ID: <YMnY7RLW6ml4Tq0g@dell> (raw)
In-Reply-To: <20210615103400.946-2-alistair@alistair23.me>

On Tue, 15 Jun 2021, Alistair Francis wrote:

> Initial support for the Silergy SY7636A Power Management chip.
> 
> Signed-off-by: Alistair Francis <alistair@alistair23.me>
> ---
>  drivers/mfd/Kconfig         |  9 ++++
>  drivers/mfd/Makefile        |  1 +
>  drivers/mfd/sy7636a.c       | 82 +++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/sy7636a.h | 47 +++++++++++++++++++++
>  4 files changed, 139 insertions(+)
>  create mode 100644 drivers/mfd/sy7636a.c
>  create mode 100644 include/linux/mfd/sy7636a.h
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 5c7f2b100191..7d6cf32b1549 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1339,6 +1339,15 @@ config MFD_SYSCON
>  	  Select this option to enable accessing system control registers
>  	  via regmap.
>  
> +config MFD_SY7636A
> +	tristate "Silergy SY7636A Power Management chip"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	depends on I2C
> +	help
> +	  Select this option to enable support for the Silergy SY7636A
> +	  Power Management chip.
> +
>  config MFD_DAVINCI_VOICECODEC
>  	tristate
>  	select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 4f6d2b8a5f76..f95e1e725a95 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -265,6 +265,7 @@ obj-$(CONFIG_MFD_STMFX) 	+= stmfx.o
>  obj-$(CONFIG_MFD_KHADAS_MCU) 	+= khadas-mcu.o
>  obj-$(CONFIG_MFD_ACER_A500_EC)	+= acer-ec-a500.o
>  
> +obj-$(CONFIG_MFD_SY7636A)	+= sy7636a.o
>  obj-$(CONFIG_SGI_MFD_IOC3)	+= ioc3.o
>  obj-$(CONFIG_MFD_SIMPLE_MFD_I2C)	+= simple-mfd-i2c.o
>  obj-$(CONFIG_MFD_INTEL_M10_BMC)   += intel-m10-bmc.o
> diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c
> new file mode 100644
> index 000000000000..e08f29ea63f8
> --- /dev/null
> +++ b/drivers/mfd/sy7636a.c
> @@ -0,0 +1,82 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +//

Only the SPDX with C++ style comments please.

> +// MFD parent driver for SY7636A chip

Drop the MFD part.  It's a Linuxisum that doesn't really exist.

> +// Copyright (C) 2021 reMarkable AS - http://www.remarkable.com/
> +//
> +// Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>
> +//          Alistair Francis <alistair@alistair23.me>
> +//
> +// Based on the lp87565 driver by Keerthy <j-keerthy@ti.com>
> +
> +#include <linux/interrupt.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +
> +#include <linux/mfd/sy7636a.h>
> +
> +static const struct regmap_config sy7636a_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};
> +
> +static const struct mfd_cell sy7636a_cells[] = {
> +	{ .name = "sy7636a-regulator", },
> +	{ .name = "sy7636a-temperature", },
> +	{ .name = "sy7636a-thermal", },
> +};
> +
> +static const struct of_device_id of_sy7636a_match_table[] = {
> +	{ .compatible = "silergy,sy7636a", },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, of_sy7636a_match_table);

Hold on.  This driver doesn't really do anything.  If you create OF
nodes for all the sub-devices, you can use simple-mfd-i2c.

Any reason you can't do that?

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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