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gpio: pca953x_gpio: Add support for 24 bit IO expander

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J721e EVM has a TCA6424 IO expander that has 24 GPIOs. Add support for
the same

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
This commit is contained in:
Vignesh Raghavendra 2020-01-27 23:19:00 +05:30 committed by Lokesh Vutla
parent 8e9c88e387
commit dd6638a018
1 changed files with 9 additions and 2 deletions
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11
drivers/gpio/pca953x_gpio.c
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@ -15,8 +15,7 @@
*
* TODO:
* 1. Support PCA957X_TYPE
* 2. Support 24 gpio pins
* 3. Support Polarity Inversion
* 2. Support Polarity Inversion
*/
#include <common.h>
@ -118,6 +117,10 @@ 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 <= 24) {
/* Auto increment */
ret = dm_i2c_read(dev, (reg << 2) | 0x80, val,
info->bank_count);
} else if (info->gpio_count == 40) {
/* Auto increment */
ret = dm_i2c_read(dev, (reg << 3) | 0x80, val,
@ -139,6 +142,10 @@ static int pca953x_write_regs(struct udevice *dev, int reg, u8 *val)
ret = dm_i2c_write(dev, reg, val, 1);
} else if (info->gpio_count <= 16) {
ret = dm_i2c_write(dev, reg << 1, val, info->bank_count);
} else if (info->gpio_count <= 24) {
/* Auto increment */
ret = dm_i2c_write(dev, (reg << 2) | 0x80, val,
info->bank_count);
} else if (info->gpio_count == 40) {
/* Auto increment */
ret = dm_i2c_write(dev, (reg << 3) | 0x80, val, info->bank_count);