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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>
12 lines
315 B
C
12 lines
315 B
C
#ifndef __SYSDEV_SIMPLE_GPIO_H
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#define __SYSDEV_SIMPLE_GPIO_H
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#include <linux/errno.h>
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#ifdef CONFIG_SIMPLE_GPIO
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extern void simple_gpiochip_init(const char *compatible);
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#else
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static inline void simple_gpiochip_init(const char *compatible) {}
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#endif /* CONFIG_SIMPLE_GPIO */
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#endif /* __SYSDEV_SIMPLE_GPIO_H */
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