diff options
| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2008-12-18 19:37:26 +0300 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2008-12-30 20:13:45 +0300 |
| commit | 3d64de9c50619d32eb71d993d23a50b98d12d3c0 (patch) | |
| tree | c6477e8309eaddf30c64619794e1f44775cd7352 /arch/powerpc/sysdev/simple_gpio.h | |
| parent | 94409d6e1088517b6d6c8e669c604cc86d08ac1b (diff) | |
| download | linux-3d64de9c50619d32eb71d993d23a50b98d12d3c0.tar.xz | |
powerpc: Implement GPIO driver for simple memory-mapped banks
The driver supports very simple GPIO controllers, that is, when a
controller provides just a 'data' register. Such controllers may be
found in various BCSRs (Board's FPGAs used to control board's
switches, LEDs, chip-selects, Ethernet/USB PHY power, etc).
So far we support only 1-byte GPIO banks. Support for other widths may
be implemented when/if needed.
p.s.
To avoid "made up" compatible entries (like compatible = "simple-gpio"),
boards must call simple_gpiochip_init() to pass the compatible string.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/sysdev/simple_gpio.h')
| -rw-r--r-- | arch/powerpc/sysdev/simple_gpio.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/simple_gpio.h b/arch/powerpc/sysdev/simple_gpio.h new file mode 100644 index 000000000000..3a7b0c513c76 --- /dev/null +++ b/arch/powerpc/sysdev/simple_gpio.h @@ -0,0 +1,12 @@ +#ifndef __SYSDEV_SIMPLE_GPIO_H +#define __SYSDEV_SIMPLE_GPIO_H + +#include <linux/errno.h> + +#ifdef CONFIG_SIMPLE_GPIO +extern void simple_gpiochip_init(const char *compatible); +#else +static inline void simple_gpiochip_init(const char *compatible) {} +#endif /* CONFIG_SIMPLE_GPIO */ + +#endif /* __SYSDEV_SIMPLE_GPIO_H */ |