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Fri, 23 Jul 2021 03:59:12 -0400 (EDT) From: Andrew Jeffery To: linux-leds@vger.kernel.org, linux-gpio@vger.kernel.org Cc: clg@kaod.org, robh+dt@kernel.org, joel@jms.id.au, pavel@ucw.cz, linus.walleij@linaro.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 0/6] leds: Fix pca955x GPIO pin mappings Date: Fri, 23 Jul 2021 17:28:52 +0930 Message-Id: <20210723075858.376378-1-andrew@aj.id.au> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210723_005921_888453_A7BE4253 X-CRM114-Status: GOOD ( 11.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello, This series does a bunch of crimes, so it's an RFC. I'm cross-posting to the pinctrl/GPIO and LEDs lists because the PCA955x devices impact all of them. What needs fixing is the leds-pca955x driver's failure to map the GPIO numberspace to the pin numberspace of the PCA955x devices. The series solves that by implementing pinctrl and pinmux in the leds-pca955x driver. Things I'm unsure about: 1. Patch 1: The pinctrl_gpio_as_pin() API feels a bit dirty, not sure what others thoughts are on that (Linus?). 2. Patch 2: I've added a new callback to hook the entirety of the pinctrl map parsing rather than supplying a subnode-specific callback. This was necessary to handle the PCA955x devicetree binding in a backwards compatible way. 3. Patch 4: The PCA955x devices don't actually have any pinmux hardware, but the properties of the pinctrl/pinmux subsystems in the kernel map nicely onto the problem we have. But it's quite a bit of code... 4. Patch 6: I also lost a bunch of time to overlooking the get_group_pins() callback for pinctrl, and it seems odd to me that it isn't required. Please review! Andrew Andrew Jeffery (6): pinctrl: Add pinctrl_gpio_as_pin() pinctrl: Add hook for device-specific map parsing leds: pca955x: Relocate chipdef-related descriptors leds: pca955x: Use pinctrl to map GPIOs to pins ARM: dts: rainier: Add presence-detect and fault indictor GPIO expander pinctrl: Check get_group_pins callback on init arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts | 76 +++ drivers/leds/leds-pca955x.c | 554 +++++++++++++++---- drivers/pinctrl/core.c | 28 +- include/linux/pinctrl/pinctrl.h | 4 + 4 files changed, 566 insertions(+), 96 deletions(-)