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Code Issues

realtek: fix RTL8231 gpio expander for high GPIOs 

GPIOs > 31 require special handling. This patch fixes both the
initialisation and direction get/set operations.

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-by: Sander Vanheule <sander@svanheule.net>
This commit is contained in:
Paul Fertser 2021-09-20 20:13:35 +03:00 committed by Adrian Schmutzler
parent 8ea0d08e0e
commit 16ae56b4f9
1 changed files with 8 additions and 5 deletions
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13
target/linux/realtek/files-5.4/drivers/gpio/gpio-rtl8231.c
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@ -106,12 +106,11 @@ static int rtl8231_pin_dir(struct rtl8231_gpios *gpios, u32 gpio, u32 dir)
u32 v;
int pin_sel_addr = RTL8231_GPIO_PIN_SEL(gpio);
int pin_dir_addr = RTL8231_GPIO_DIR(gpio);
int pin = gpio % 16;
int dpin = pin;
int dpin = gpio % 16;
if (gpio > 31) {
pr_debug("WARNING: HIGH pin\n");
dpin = pin << 5;
dpin += 5;
pin_dir_addr = pin_sel_addr;
}
@ -140,7 +139,7 @@ static int rtl8231_pin_dir_get(struct rtl8231_gpios *gpios, u32 gpio, u32 *dir)
if (gpio > 31) {
pin_dir_addr = RTL8231_GPIO_PIN_SEL(gpio);
pin = pin << 5;
pin += 5;
}
v = rtl8231_read(gpios, pin_dir_addr);
@ -240,6 +239,8 @@ void rtl8231_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
int rtl8231_init(struct rtl8231_gpios *gpios)
{
u32 v;
pr_info("%s called, MDIO bus ID: %d\n", __func__, gpios->smi_bus_id);
gpios->reg_cached = 0;
@ -253,9 +254,11 @@ int rtl8231_init(struct rtl8231_gpios *gpios)
sw_w32_mask(3, 1, RTL838X_DMY_REG5);
}
/*Select GPIO functionality for pins 0-15, 16-31 and 32-37 */
/* Select GPIO functionality for pins 0-34 */
rtl8231_write(gpios, RTL8231_GPIO_PIN_SEL(0), 0xffff);
rtl8231_write(gpios, RTL8231_GPIO_PIN_SEL(16), 0xffff);
v = rtl8231_read(gpios, RTL8231_GPIO_PIN_SEL(32));
rtl8231_write(gpios, RTL8231_GPIO_PIN_SEL(32), v | 0x7);
return 0;
}