pinctrl: meson: Fix wrong shift value when get drive-strength

In meson_pinconf_get_drive_strength, variable bit is calculated by
meson_calc_reg_and_bit, this value is the offset from the first pin of a
certain bank to current pin, while Meson SoCs use two bits for each pin
to depict drive-strength. So a left shift by 1 should be done or node
pinconf-pins shows wrong message.

Fixes: 6ea3e3bbef37 ("pinctrl: meson: add support of drive-strength-microamp")

Signed-off-by: Qianggui Song <qianggui.song@amlogic.com>
Link: https://lore.kernel.org/r/20191226023734.9631-1-qianggui.song@amlogic.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
index 3c80828..bbc919b 100644 (file)
--- a/drivers/pinctrl/meson/pinctrl-meson.c
+++ b/drivers/pinctrl/meson/pinctrl-meson.c
@@ -441,6 +441,7 @@ static int meson_pinconf_get_drive_strength(struct meson_pinctrl *pc,
                return ret;
 
        meson_calc_reg_and_bit(bank, pin, REG_DS, &reg, &bit);
+       bit = bit << 1;
 
        ret = regmap_read(pc->reg_ds, reg, &val);
        if (ret)