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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH] gpio: iopoll: implement gpio_poll_timeout_us
Date: Thu, 29 Aug 2019 14:43:18 +0200	[thread overview]
Message-ID: <20190829124318.30339-1-a.fatoum@pengutronix.de> (raw)

Sometimes we need to wait for state change on a GPIO,
provide a helper to do this.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 include/gpio.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/gpio.h b/include/gpio.h
index 1926edeca757..89cb306a195c 100644
--- a/include/gpio.h
+++ b/include/gpio.h
@@ -3,6 +3,7 @@
 
 #include <linux/types.h>
 #include <linux/list.h>
+#include <linux/iopoll.h>
 
 #ifdef CONFIG_GENERIC_GPIO
 void gpio_set_value(unsigned gpio, int value);
@@ -31,6 +32,13 @@ 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);
+
+#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 +51,8 @@ static inline int gpio_direction_active(unsigned gpio, int value)
 {
 	return -EINVAL;
 }
+
+#define gpio_poll_timeout_us(gpio, val, timeout_us) (-ENOSYS)
 #endif
 
 #if defined(CONFIG_ARCH_NR_GPIO) && CONFIG_ARCH_NR_GPIO > 0
-- 
2.23.0


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             reply	other threads:[~2019-08-29 12:43 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-29 12:43 Ahmad Fatoum [this message]
2019-08-30  4:18 ` Oleksij Rempel
2019-08-30  8:55   ` Ahmad Fatoum
2019-09-02  7:16 ` Sascha Hauer

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