From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i7Ep0-0004iT-Qn for barebox@lists.infradead.org; Mon, 09 Sep 2019 08:14:52 +0000 From: Ahmad Fatoum Date: Mon, 9 Sep 2019 10:14:44 +0200 Message-Id: <20190909081444.31077-1-a.fatoum@pengutronix.de> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH v2] gpio: iopoll: implement gpio_poll_timeout_us To: barebox@lists.infradead.org Cc: Ahmad Fatoum Sometimes we need to wait for state change on a GPIO, provide a helper for future code to do this. Signed-off-by: Ahmad Fatoum --- v1 -> v2: Add comment describing use of macro --- include/gpio.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/gpio.h b/include/gpio.h index 38d6ba2df913..867f3d1dbdc6 100644 --- a/include/gpio.h +++ b/include/gpio.h @@ -3,6 +3,7 @@ #include #include +#include #ifdef CONFIG_GENERIC_GPIO void gpio_set_value(unsigned gpio, int value); @@ -31,6 +32,21 @@ static inline int gpio_direction_input(unsigned gpio) void gpio_set_active(unsigned gpio, bool state); int gpio_is_active(unsigned gpio); int gpio_direction_active(unsigned gpio, bool state); + +/** + * gpio_poll_timeout_us - Poll till GPIO reaches requested active state + * @gpio: gpio to poll + * @active: wait till GPIO is active if true, wait till it's inactive if false + * @timeout_us: timeout in microseconds + * + * During the wait barebox pollers are called, if any. + */ +#define gpio_poll_timeout_us(gpio, active, timeout_us) \ + ({ \ + int __state; \ + readx_poll_timeout(gpio_is_active, gpio, __state, \ + __state == (active), timeout_us); \ + }) #else static inline void gpio_set_active(unsigned gpio, int value) { @@ -43,6 +59,8 @@ static inline int gpio_direction_active(unsigned gpio, int value) { return -EINVAL; } + +#define gpio_poll_timeout_us(gpio, val, timeout_us) (-ENOSYS) #endif #define ARCH_NR_GPIOS 256 -- 2.23.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox