mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
4a22b8a4ad
The gpios on the max730x chips have support for internal pullups while in
input mode.
This patch adds support for configuring these pullups via platform data.
A new member ("input_pullup_active") to the platform data struct is
introduced. A set bit in this variable activates the pullups while the
respective port is in input mode. This is a compatible enhancement since
unset bits lead to disables pullups which was the default in the original
driver.
_Note_: the 4 lowest bits in "input_pullup_active" are unused because the
first 4 ports of the controller are not used, too.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
36 lines
900 B
C
36 lines
900 B
C
#ifndef LINUX_SPI_MAX7301_H
|
|
#define LINUX_SPI_MAX7301_H
|
|
|
|
#include <linux/gpio.h>
|
|
|
|
/*
|
|
* Some registers must be read back to modify.
|
|
* To save time we cache them here in memory
|
|
*/
|
|
struct max7301 {
|
|
struct mutex lock;
|
|
u8 port_config[8]; /* field 0 is unused */
|
|
u32 out_level; /* cached output levels */
|
|
u32 input_pullup_active;
|
|
struct gpio_chip chip;
|
|
struct device *dev;
|
|
int (*write)(struct device *dev, unsigned int reg, unsigned int val);
|
|
int (*read)(struct device *dev, unsigned int reg);
|
|
};
|
|
|
|
struct max7301_platform_data {
|
|
/* number assigned to the first GPIO */
|
|
unsigned base;
|
|
/*
|
|
* bitmask controlling the pullup configuration,
|
|
*
|
|
* _note_ the 4 lowest bits are unused, because the first 4
|
|
* ports of the controller are not used, too.
|
|
*/
|
|
u32 input_pullup_active;
|
|
};
|
|
|
|
extern int __max730x_remove(struct device *dev);
|
|
extern int __max730x_probe(struct max7301 *ts);
|
|
#endif
|