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Thu, 1 Aug 2019 20:45:21 +0200 From: Schrempf Frieder To: "u.kleine-koenig@pengutronix.de" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , "festevam@gmail.com" , "linux-imx@nxp.com" , Greg Kroah-Hartman Subject: [PATCH v2 1/3] serial: mctrl_gpio: Avoid probe failures in case of missing gpiolib Thread-Topic: [PATCH v2 1/3] serial: mctrl_gpio: Avoid probe failures in case of missing gpiolib Thread-Index: AQHVSJlF+cJCIhOOZEmFG6rcowK4DA== Date: Thu, 1 Aug 2019 18:45:21 +0000 Message-ID: <20190801184505.17239-1-frieder.schrempf@kontron.de> Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.17.1 x-originating-ip: [172.25.9.193] x-c2processedorg: 51b406b7-48a2-4d03-b652-521f56ac89f3 MIME-Version: 1.0 X-SnT-MailScanner-Information: Please contact the ISP for more information X-SnT-MailScanner-ID: ED90367A7B0.AF516 X-SnT-MailScanner: Not scanned: please contact your Internet E-Mail Service Provider for details X-SnT-MailScanner-SpamCheck: X-SnT-MailScanner-From: frieder.schrempf@kontron.de X-SnT-MailScanner-To: festevam@gmail.com, geert+renesas@glider.be, gregkh@linuxfoundation.org, jslaby@suse.com, kernel@pengutronix.de, linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, s.hauer@pengutronix.de, shawnguo@kernel.org, u.kleine-koenig@pengutronix.de X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190801_114526_154392_ABBA68D8 X-CRM114-Status: GOOD ( 11.43 ) 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: "geert+renesas@glider.be" , "linux-kernel@vger.kernel.org" , Schrempf Frieder , "linux-serial@vger.kernel.org" , Jiri Slaby , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Frieder Schrempf If CONFIG_GPIOLIB is not enabled, mctrl_gpio_init() and mctrl_gpio_init_noauto() will currently return an error pointer with -ENOSYS. As the mctrl GPIOs are usually optional, drivers need to check for this condition to allow continue probing. To avoid the need for this check in each driver, we return NULL instead, as all the mctrl_gpio_*() functions are skipped anyway. We also adapt mctrl_gpio_to_gpiod() to be in line with this change. Signed-off-by: Frieder Schrempf Reviewed-by: Fabio Estevam --- Changes in v2 ============= * Move the sh_sci changes to a separate patch * Add a patch for the 8250 driver * Add Fabio's R-b tag --- drivers/tty/serial/serial_mctrl_gpio.c | 3 +++ drivers/tty/serial/serial_mctrl_gpio.h | 6 +++--- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index 2b400189be91..54c43e02e375 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -61,6 +61,9 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set); struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, enum mctrl_gpio_idx gidx) { + if (gpios == NULL) + return NULL; + return gpios->gpio[gidx]; } EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod); diff --git a/drivers/tty/serial/serial_mctrl_gpio.h b/drivers/tty/serial/serial_mctrl_gpio.h index b7d3cca48ede..1b2ff503b2c2 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.h +++ b/drivers/tty/serial/serial_mctrl_gpio.h @@ -114,19 +114,19 @@ static inline struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, enum mctrl_gpio_idx gidx) { - return ERR_PTR(-ENOSYS); + return NULL; } static inline struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx) { - return ERR_PTR(-ENOSYS); + return NULL; } static inline struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx) { - return ERR_PTR(-ENOSYS); + return NULL; } static inline -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel