From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Walle Subject: Re: [PATCH v5 02/13] mfd: add simple regmap based I2C driver Date: Mon, 20 Jul 2020 00:31:29 +0200 Message-ID: <52d85ea1ddc488762df547168e2001e9@walle.cc> References: <20200706175353.16404-1-michael@walle.cc> <20200706175353.16404-3-michael@walle.cc> <20200717090656.GF3165313@dell> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20200717090656.GF3165313@dell> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Lee Jones 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 , Bartosz Golaszewski , Rob Herring , Jean Delvare , Guenter Roeck , Thierry Reding , =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= , Wim Van Sebroeck , Shawn Guo , Li Yang , Thomas Gleixner , Jason Cooper , Marc Zyngier , Mark Brown , Greg List-Id: linux-pwm@vger.kernel.org Am 2020-07-17 11:06, schrieb Lee Jones: > 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 >> --- >> 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" > > Doesn't look like tristate to me. > > Haven't you made this builtin only? Mh yeah, I forgot to change it to module in the driver. I don't know whats better though, have it tristate or just offer a boolean option because it should be small anyway. What do you think? My interrupt driver will force it to boolean anyway. > >> + depends on I2C >> + select MFD_CORE > > Why? leftover :( I'll remove it. >> + select REGMAP_I2C >> + help >> + This is a consolidated driver for all MFD devices which are >> + basically just a regmap bus driver. > > Please expand on this. I think it deserves greater explanation. ok. > >> config MFD_SM501 >> tristate "Silicon Motion SM501" >> depends on HAS_DMA -- -michael