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dm: gpio: pca953x: Support PCA953X with 40 GPIOs

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A DM driver for PCA953x was recently introduced by Peng Fan, which lacked
support for the 40 GPIO versions.

This patch adds support for these chips.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Peng Fan  <van.freenix@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
mario.six@gdsys.cc 2016-04-25 15:25:37 +02:00 committed by Tom Rini
parent f71cee4bfc
commit 71db3270db
1 changed files with 6 additions and 3 deletions
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9
drivers/gpio/pca953x_gpio.c
View File

@ -16,8 +16,8 @@
*
* TODO:
* 1. Support PCA957X_TYPE
* 2. Support max 40 gpio pins
* 3. Support Plolarity Inversion
* 2. Support 24 gpio pins
* 3. Support Polarity Inversion
*/
#include <common.h>
@ -47,7 +47,7 @@ enum {
PCA953X_DIRECTION_OUT,
};
#define MAX_BANK 3
#define MAX_BANK 5
#define BANK_SZ 8
DECLARE_GLOBAL_DATA_PTR;
@ -121,6 +121,9 @@ static int pca953x_read_regs(struct udevice *dev, int reg, u8 *val)
ret = dm_i2c_read(dev, reg, val, 1);
} else if (info->gpio_count <= 16) {
ret = dm_i2c_read(dev, reg << 1, val, info->bank_count);
} else if (info->gpio_count == 40) {
/* Auto increment */
ret = dm_i2c_read(dev, (reg << 3) | 0x80, val, info->bank_count);
} else {
dev_err(dev, "Unsupported now\n");
return -EINVAL;