From cd8f00ce08102d2dbb350c76bbb53f7b0f804b7d Mon Sep 17 00:00:00 2001 From: David Wu Date: Tue, 16 Apr 2019 21:50:56 +0800 Subject: pinctrl: rockchip: Special treatment for RK3288 gpio0 pins' iomux RK3288 pmu_gpio0 iomux setting have no higher 16 writing corresponding bits, need to read before write the register. Signed-off-by: David Wu Signed-off-by: Kever Yang --- 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); -- cgit