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

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

[Qianggui Song]

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>
---
 drivers/pinctrl/meson/pinctrl-meson.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
index 3c80828a5e50..bbc919bef2bf 100644
--- 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)
-- 
2.24.0


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Re: [PATCH] pinctrl: meson: Fix wrong shift value when get drive-strength

[Linus Walleij]

On Thu, Dec 26, 2019 at 3:37 AM Qianggui Song <qianggui.song@amlogic.com> wrote:

> 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>

Patch applied.

Yours,
Linus Walleij

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