RK3288 pmu_gpio0 iomux setting have no higher 16 writing corresponding bits, need to read before write the register.
Signed-off-by: David Wu david.wu@rock-chips.com ---
Change in v3: - Add some comment
drivers/pinctrl/rockchip/pinctrl-rk3288.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/pinctrl/rockchip/pinctrl-rk3288.c b/drivers/pinctrl/rockchip/pinctrl-rk3288.c index 1fa601d954..5040cd8f48 100644 --- a/drivers/pinctrl/rockchip/pinctrl-rk3288.c +++ b/drivers/pinctrl/rockchip/pinctrl-rk3288.c @@ -54,7 +54,15 @@ static int rk3288_set_mux(struct rockchip_pin_bank *bank, int pin, int mux) } }
- data = (mask << (bit + 16)); + /* bank0 is special, there are no higher 16 bit writing bits. */ + if (bank->bank_num == 0) { + regmap_read(regmap, reg, &data); + data &= ~(mask << bit); + } else { + /* enable the write to the equivalent lower bits */ + data = (mask << (bit + 16)); + } + data |= (mux & mask) << bit; ret = regmap_write(regmap, reg, data);