From: Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: Michael Walle <michael-QKn5cuLxLXY@public.gmane.org>
Cc: linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-hwmon-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-pwm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-watchdog-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
"Linus Walleij"
<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"Bartosz Golaszewski"
<bgolaszewski-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>,
"Rob Herring" <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"Jean Delvare" <jdelvare-IBi9RG/b67k@public.gmane.org>,
"Guenter Roeck" <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>,
"Thierry Reding"
<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"Uwe Kleine-König"
<u.kleine-koenig-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
"Wim Van Sebroeck"
<wim-Q8PRGTgFL9WUCWQAtAn6Ix2eb7JE58TQ@public.gmane.org>,
"Shawn Guo" <shawnguo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"Li Yang" <leoyang.li-3arQi8VN3Tc@public.gmane.org>,
"Thomas Gleixner" <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
"Jason Cooper" <jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org>,
"Marc Zyngier" <maz-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"Mark Brown" <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH v5 02/13] mfd: add simple regmap based I2C driver
Date: Fri, 17 Jul 2020 10:04:44 +0100 [thread overview]
Message-ID: <20200717090444.GE3165313@dell> (raw)
In-Reply-To: <20200706175353.16404-3-michael-QKn5cuLxLXY@public.gmane.org>
On Mon, 06 Jul 2020, Michael Walle wrote:
> There are I2C devices which contain several different functions but
> doesn't require any special access functions. For these kind of drivers
> an I2C regmap should be enough.
>
> Create an I2C driver which creates an I2C regmap and enumerates its
> children. If a device wants to use this as its MFD core driver, it has
> to add an individual compatible string. It may provide its own regmap
> configuration.
>
> Subdevices can use dev_get_regmap() on the parent to get their regmap
> instance.
>
> Signed-off-by: Michael Walle <michael-QKn5cuLxLXY@public.gmane.org>
> ---
> Changes since v4:
> - new patch. Lee, please bear with me. I didn't want to delay the
> new version (where a lot of remarks on the other patches were
> addressed) even more, just because we haven't figured out how
> to deal with the MFD part. So for now, I've included this one.
>
> drivers/mfd/Kconfig | 9 +++++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/simple-mfd-i2c.c | 50 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 60 insertions(+)
> create mode 100644 drivers/mfd/simple-mfd-i2c.c
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 33df0837ab41..f1536a710aca 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1162,6 +1162,15 @@ config MFD_SI476X_CORE
> To compile this driver as a module, choose M here: the
> module will be called si476x-core.
>
> +config MFD_SIMPLE_MFD_I2C
> + tristate "Simple regmap based I2C devices"
> + depends on I2C
> + select MFD_CORE
> + select REGMAP_I2C
> + help
> + This is a consolidated driver for all MFD devices which are
> + basically just a regmap bus driver.
> +
> config MFD_SM501
> tristate "Silicon Motion SM501"
> depends on HAS_DMA
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index a60e5f835283..78d24a3e7c9e 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -264,3 +264,4 @@ obj-$(CONFIG_MFD_STMFX) += stmfx.o
> obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o
>
> obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o
> +obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o
> diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
> new file mode 100644
> index 000000000000..1fdca89964b1
> --- /dev/null
> +++ b/drivers/mfd/simple-mfd-i2c.c
> @@ -0,0 +1,49 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/regmap.h>
I'm pretty sure you do not require all of these headers.
> +struct simple_mfd_i2c_config {
> + const struct regmap_config *regmap_config;
> +};
No need for this yet I feel.
Let's keep it as simple as possible.
> +static const struct regmap_config simple_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +};
> +
> +static int simple_mfd_i2c_probe(struct i2c_client *i2c)
> +{
> + const struct regmap_config *regmap_config = &simple_regmap_config;
> + const struct simple_mfd_i2c_config *config;
> + struct regmap *regmap;
> +
> + config = device_get_match_data(&i2c->dev);
Have this return regmap_config.
> + if (config && config->regmap_config)
> + regmap_config = config->regmap_config;
> +
> + regmap = devm_regmap_init_i2c(i2c, regmap_config);
> + if (IS_ERR(regmap))
> + return PTR_ERR(regmap);
> +
> + return devm_of_platform_populate(&i2c->dev);
> +}
> +
> +static const struct of_device_id simple_mfd_i2c_of_match[] = {
> + {}
> +};
> +
> +static struct i2c_driver simple_mfd_i2c_driver = {
> + .probe_new = simple_mfd_i2c_probe,
> + .driver = {
> + .name = "simple-mfd-i2c",
> + .of_match_table = simple_mfd_i2c_of_match,
> + },
> +};
> +builtin_i2c_driver(simple_mfd_i2c_driver);
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
next prev parent reply other threads:[~2020-07-17 9:04 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-06 17:53 [PATCH v5 00/13] Add support for Kontron sl28cpld Michael Walle
2020-07-06 17:53 ` [PATCH v5 01/13] regmap-irq: use fwnode instead of device node in add_irq_chip() Michael Walle
2020-07-08 10:22 ` Mark Brown
[not found] ` <20200706175353.16404-1-michael-QKn5cuLxLXY@public.gmane.org>
2020-07-06 17:53 ` [PATCH v5 02/13] mfd: add simple regmap based I2C driver Michael Walle
[not found] ` <20200706175353.16404-3-michael-QKn5cuLxLXY@public.gmane.org>
2020-07-17 9:04 ` Lee Jones [this message]
2020-07-19 22:25 ` Michael Walle
2020-07-17 9:06 ` Lee Jones
2020-07-19 22:31 ` Michael Walle
2020-07-20 7:43 ` Lee Jones
2020-07-06 17:53 ` [PATCH v5 06/13] watchdog: add support for sl28cpld watchdog Michael Walle
2020-07-06 17:53 ` [PATCH v5 12/13] arm64: dts: freescale: sl28: enable LED support Michael Walle
2020-07-17 8:36 ` Pavel Machek
2020-07-17 21:54 ` Michael Walle
2020-07-06 17:53 ` [PATCH v5 03/13] dt-bindings: mfd: Add bindings for sl28cpld Michael Walle
2020-07-13 16:04 ` Rob Herring
2020-07-06 17:53 ` [PATCH v5 04/13] mfd: simple-mfd-i2c: add sl28cpld support Michael Walle
2020-07-06 17:53 ` [PATCH v5 05/13] irqchip: add sl28cpld interrupt controller support Michael Walle
2020-07-08 9:37 ` Marc Zyngier
2020-07-06 17:53 ` [PATCH v5 07/13] pwm: add support for sl28cpld PWM controller Michael Walle
2020-07-09 8:50 ` Uwe Kleine-König
[not found] ` <20200709085006.b54ype3p4yu64upl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2020-07-11 17:28 ` Michael Walle
2020-07-13 8:47 ` Uwe Kleine-König
2020-07-14 11:31 ` Michael Walle
2020-07-14 16:08 ` Uwe Kleine-König
2020-07-14 21:09 ` Michael Walle
2020-07-15 16:36 ` Uwe Kleine-König
2020-07-15 17:45 ` Michael Walle
2020-07-15 18:18 ` Uwe Kleine-König
2020-07-15 20:41 ` Michael Walle
2020-07-16 6:10 ` Uwe Kleine-König
2020-07-06 17:53 ` [PATCH v5 08/13] gpio: add support for the sl28cpld GPIO controller Michael Walle
[not found] ` <20200706175353.16404-9-michael-QKn5cuLxLXY@public.gmane.org>
2020-07-08 7:35 ` Linus Walleij
2020-07-17 0:25 ` kernel test robot
2020-07-06 17:53 ` [PATCH v5 09/13] hwmon: add support for the sl28cpld hardware monitoring controller Michael Walle
2020-07-06 17:53 ` [PATCH v5 10/13] arm64: dts: freescale: sl28: enable sl28cpld Michael Walle
2020-07-06 17:53 ` [PATCH v5 11/13] arm64: dts: freescale: sl28: map GPIOs to input events Michael Walle
2020-07-06 17:53 ` [PATCH v5 13/13] arm64: dts: freescale: sl28: enable fan support Michael Walle
[not found] ` <20200706175353.16404-14-michael-QKn5cuLxLXY@public.gmane.org>
2020-07-08 7:39 ` Linus Walleij
[not found] ` <CACRpkdaPO7CGNrxmjL5QH1cxP5wqku1oMtQaQgJfeKiKqiGAOg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-07-08 7:56 ` Michael Walle
2020-07-08 17:00 ` [PATCH v5 00/13] Add support for Kontron sl28cpld Mark Brown
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