diff options
| author | Sean Wang <sean.wang@mediatek.com> | 2018-09-08 14:07:25 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-09-19 00:52:57 +0300 |
| commit | 0d7ca772148fe89149426bde59aaedcb3081d92d (patch) | |
| tree | b970b1b56dbf44da2bafa5a11becaaa1981d3173 /drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | |
| parent | 85430152ba468acbfc2d7bc81c57bb2f93a24641 (diff) | |
| download | linux-0d7ca772148fe89149426bde59aaedcb3081d92d.tar.xz | |
pinctrl: mediatek: add advanced pull related support to pinctrl-mtk-common-v2.c
There are some specific pins (i.e. MMC/SD) need specific registers to
turn on/off the 10K & 50k(75K) resistors when pull up/down.
Therefore, this patch adds the custom prarmeters so that the user could
control it through device tree.
Signed-off-by: Ryder.Lee <ryder.lee@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c')
| -rw-r--r-- | drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c index 67c95ef85ba9..e66bf49a8c4c 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c @@ -358,3 +358,58 @@ int mtk_pinconf_drive_get_rev1(struct mtk_pinctrl *hw, return 0; } + +int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw, + const struct mtk_pin_desc *desc, bool pullup, + u32 arg) +{ + int err; + + /* 10K off & 50K (75K) off, when (R0, R1) = (0, 0); + * 10K off & 50K (75K) on, when (R0, R1) = (0, 1); + * 10K on & 50K (75K) off, when (R0, R1) = (1, 0); + * 10K on & 50K (75K) on, when (R0, R1) = (1, 1) + */ + err = mtk_hw_set_value(hw, desc->number, PINCTRL_PIN_REG_R0, arg & 1); + if (err) + return 0; + + err = mtk_hw_set_value(hw, desc->number, PINCTRL_PIN_REG_R1, + !!(arg & 2)); + if (err) + return 0; + + arg = pullup ? 0 : 1; + + err = mtk_hw_set_value(hw, desc->number, PINCTRL_PIN_REG_PUPD, arg); + + return err; +} + +int mtk_pinconf_adv_pull_get(struct mtk_pinctrl *hw, + const struct mtk_pin_desc *desc, bool pullup, + u32 *val) +{ + u32 t, t2; + int err; + + err = mtk_hw_get_value(hw, desc->number, PINCTRL_PIN_REG_PUPD, &t); + if (err) + return err; + + /* t == 0 supposes PULLUP for the customized PULL setup */ + if (pullup ^ !t) + return -EINVAL; + + err = mtk_hw_get_value(hw, desc->number, PINCTRL_PIN_REG_R0, &t); + if (err) + return err; + + err = mtk_hw_get_value(hw, desc->number, PINCTRL_PIN_REG_R1, &t2); + if (err) + return err; + + *val = (t | t2 << 1) & 0x7; + + return 0; +} |