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Wed, 10 Jun 2020 00:19:42 -0700 (PDT) Date: Wed, 10 Jun 2020 08:19:40 +0100 From: Lee Jones To: Michael Walle Cc: Andy Shevchenko , Ranjani Sridharan , david.m.ertman@intel.com, shiraz.saleem@intel.com, Rob Herring , Mark Brown , "open list:GPIO SUBSYSTEM" , devicetree , Linux Kernel Mailing List , linux-hwmon@vger.kernel.org, linux-pwm@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-arm Mailing List , Linus Walleij , Bartosz Golaszewski , Jean Delvare , Guenter Roeck , Thierry Reding , Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , Wim Van Sebroeck , Shawn Guo , Li Yang , Thomas Gleixner , Jason Cooper , Marc Zyngier , Greg Kroah-Hartman , Andy Shevchenko Subject: Re: [PATCH v4 02/11] mfd: Add support for Kontron sl28cpld management controller Message-ID: <20200610071940.GS4106@dell> References: <7d7feb374cbf5a587dc1ce65fc3ad672@walle.cc> <20200608185651.GD4106@dell> <32231f26f7028d62aeda8fdb3364faf1@walle.cc> <20200609064735.GH4106@dell> <32287ac0488f7cbd5a7d1259c284e554@walle.cc> <20200609151941.GM4106@dell> <95e6ec9bbdf6af7a9ff9c31786f743f2@walle.cc> <20200609194505.GQ4106@dell> <3a6931248f0efcaf8efbb5425a9bd833@walle.cc> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <3a6931248f0efcaf8efbb5425a9bd833@walle.cc> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org On Wed, 10 Jun 2020, Michael Walle wrote: > Am 2020-06-09 21:45, schrieb Lee Jones: > > On Tue, 09 Jun 2020, Michael Walle wrote: > > > > We do not need a 'simple-regmap' solution for your use-case. > > > > > > > > Since your device's registers are segregated, just split up the > > > > register map and allocate each sub-device with it's own slice. > > > > > > I don't get it, could you make a device tree example for my > > > use-case? (see also above) > > > > &i2cbus { > > mfd-device@10 { > > compatible = "simple-mfd"; > > reg = <10>; > > > > sub-device@10 { > > compatible = "vendor,sub-device"; > > reg = <10>; > > }; > > }; > > > > The Regmap config would be present in each of the child devices. > > > > Each child device would call devm_regmap_init_i2c() in .probe(). > > Ah, I see. If I'm not wrong, this still means to create an i2c > device driver with the name "simple-mfd". Yes, it does. > Besides that, I don't like this, because: > - Rob already expressed its concerns with "simple-mfd" and so on. Where did this take place? I'd like to read up on this. > - you need to duplicate the config in each sub device You can have a share a single config. > - which also means you are restricting the sub devices to be > i2c only (unless you implement and duplicate other regmap configs, > too). For this driver, SPI and MMIO may be viable options. You could also have a shared implementation to choose between different busses. > Thus, I'd rather implement a simple-mfd.c which implement a common > I2C driver for now and populate its children using > devm_of_platform_populate(). This could be extended to support other > type of regmaps like SPI in the future. > > Also some MFD drivers could be moved to this, a likely candidate is > the smsc-ece1099.c. Although I don't really understand its purpose, > if don't have CONFIG_OF. > > Judging from the existing code, this simple-mfd.c wouldn't just be > "a list of compatible" strings but also additional quirks and tweaks > for particular devices in this list. Hold off on the simple-mfd.c idea, as I'm not taken by it yet and wouldn't want you to waste your time. I have another idea which would help. Give me a few days to put something together. -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: Re: [PATCH v4 02/11] mfd: Add support for Kontron sl28cpld management controller Date: Wed, 10 Jun 2020 08:19:40 +0100 Message-ID: <20200610071940.GS4106@dell> References: <7d7feb374cbf5a587dc1ce65fc3ad672@walle.cc> <20200608185651.GD4106@dell> <32231f26f7028d62aeda8fdb3364faf1@walle.cc> <20200609064735.GH4106@dell> <32287ac0488f7cbd5a7d1259c284e554@walle.cc> <20200609151941.GM4106@dell> <95e6ec9bbdf6af7a9ff9c31786f743f2@walle.cc> <20200609194505.GQ4106@dell> <3a6931248f0efcaf8efbb5425a9bd833@walle.cc> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: Content-Disposition: inline In-Reply-To: <3a6931248f0efcaf8efbb5425a9bd833@walle.cc> Sender: linux-gpio-owner@vger.kernel.org To: Michael Walle Cc: Andy Shevchenko , Ranjani Sridharan , david.m.ertman@intel.com, shiraz.saleem@intel.com, Rob Herring , Mark Brown , "open list:GPIO SUBSYSTEM" , devicetree , Linux Kernel Mailing List , linux-hwmon@vger.kernel.org, linux-pwm@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-arm Mailing List , Linus Walleij , Bartosz Golaszewski , Jean Delvare , Guenter Roeck , Thierry Reding , Uwe List-Id: linux-pwm@vger.kernel.org On Wed, 10 Jun 2020, Michael Walle wrote: > Am 2020-06-09 21:45, schrieb Lee Jones: > > On Tue, 09 Jun 2020, Michael Walle wrote: > > > > We do not need a 'simple-regmap' solution for your use-case. > > > > > > > > Since your device's registers are segregated, just split up the > > > > register map and allocate each sub-device with it's own slice. > > > > > > I don't get it, could you make a device tree example for my > > > use-case? (see also above) > > > > &i2cbus { > > mfd-device@10 { > > compatible = "simple-mfd"; > > reg = <10>; > > > > sub-device@10 { > > compatible = "vendor,sub-device"; > > reg = <10>; > > }; > > }; > > > > The Regmap config would be present in each of the child devices. > > > > Each child device would call devm_regmap_init_i2c() in .probe(). > > Ah, I see. If I'm not wrong, this still means to create an i2c > device driver with the name "simple-mfd". Yes, it does. > Besides that, I don't like this, because: > - Rob already expressed its concerns with "simple-mfd" and so on. Where did this take place? I'd like to read up on this. > - you need to duplicate the config in each sub device You can have a share a single config. > - which also means you are restricting the sub devices to be > i2c only (unless you implement and duplicate other regmap configs, > too). For this driver, SPI and MMIO may be viable options. You could also have a shared implementation to choose between different busses. > Thus, I'd rather implement a simple-mfd.c which implement a common > I2C driver for now and populate its children using > devm_of_platform_populate(). This could be extended to support other > type of regmaps like SPI in the future. > > Also some MFD drivers could be moved to this, a likely candidate is > the smsc-ece1099.c. Although I don't really understand its purpose, > if don't have CONFIG_OF. > > Judging from the existing code, this simple-mfd.c wouldn't just be > "a list of compatible" strings but also additional quirks and tweaks > for particular devices in this list. Hold off on the simple-mfd.c idea, as I'm not taken by it yet and wouldn't want you to waste your time. I have another idea which would help. Give me a few days to put something together. -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8C4CC433E3 for ; Wed, 10 Jun 2020 07:19:49 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 979D42083B for ; 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Wed, 10 Jun 2020 00:19:42 -0700 (PDT) Received: from dell ([2.27.167.101]) by smtp.gmail.com with ESMTPSA id 67sm7063666wrk.49.2020.06.10.00.19.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Jun 2020 00:19:42 -0700 (PDT) Date: Wed, 10 Jun 2020 08:19:40 +0100 From: Lee Jones To: Michael Walle Subject: Re: [PATCH v4 02/11] mfd: Add support for Kontron sl28cpld management controller Message-ID: <20200610071940.GS4106@dell> References: <7d7feb374cbf5a587dc1ce65fc3ad672@walle.cc> <20200608185651.GD4106@dell> <32231f26f7028d62aeda8fdb3364faf1@walle.cc> <20200609064735.GH4106@dell> <32287ac0488f7cbd5a7d1259c284e554@walle.cc> <20200609151941.GM4106@dell> <95e6ec9bbdf6af7a9ff9c31786f743f2@walle.cc> <20200609194505.GQ4106@dell> <3a6931248f0efcaf8efbb5425a9bd833@walle.cc> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <3a6931248f0efcaf8efbb5425a9bd833@walle.cc> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200610_001945_429212_9FC6AE5C X-CRM114-Status: GOOD ( 21.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-pwm@vger.kernel.org, Linus Walleij , Thierry Reding , Jason Cooper , Andy Shevchenko , Marc Zyngier , Ranjani Sridharan , Bartosz Golaszewski , Andy Shevchenko , Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , david.m.ertman@intel.com, Guenter Roeck , devicetree , Jean Delvare , linux-watchdog@vger.kernel.org, "open list:GPIO SUBSYSTEM" , Mark Brown , Thomas Gleixner , Wim Van Sebroeck , shiraz.saleem@intel.com, linux-arm Mailing List , linux-hwmon@vger.kernel.org, Greg Kroah-Hartman , Linux Kernel Mailing List , Li Yang , Rob Herring , Shawn Guo Content-Type: text/plain; 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