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| author | Zhiyong Tao <zhiyong.tao@mediatek.com> | 2019-04-01 11:35:35 +0800 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2019-04-08 11:20:28 +0200 |
| commit | 5e73de3413c5e0c104588a197cbd158baa085aca (patch) | |
| tree | 87b61fc40b7362c3344b6fb7ce72f68b1b3dff36 /drivers/pinctrl/mediatek/pinctrl-paris.c | |
| parent | 9f325c9837251519968821fe82cdd81b2c450a71 (diff) | |
| download | linux-5e73de3413c5e0c104588a197cbd158baa085aca.tar.bz2 | |
pinctrl: add drive for I2C related pins on MT8183
This patch provides the advanced drive for I2C used pins on MT8183.
The detail strength specification description of the I2C pin:
When E1=0/E0=0, the strength is 0.125mA.
When E1=0/E0=1, the strength is 0.25mA.
When E1=1/E0=0, the strength is 0.5mA.
When E1=1/E0=1, the strength is 1mA.
For I2C pins, there are existing generic driving setup and the above
specific driving setup. I2C pins can only support 2/4/6/8/10/12/14/16mA
driving adjustment in generic driving setup. But in specific driving
setup, they can support 0.125/0.25/0.5/1mA adjustment.
If we enable specific driving setup for I2C pins,
the existing generic driving setup will be disabled.
For some special features, we need the I2C pins specific driving setup.
The specific driving setup is controlled by E1E0EN.
So we need add extra vendor driving preperty instead of the generic
driving property. We can add "mediatek,drive-strength-adv = <XXX>;"
to describe the specific driving setup property.
"XXX" means the value of E1E0EN. So the valid arguments of
"mediatek,drive-strength-adv" are from 0 to 7.
Signed-off-by: Zhiyong Tao <zhiyong.tao@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/mediatek/pinctrl-paris.c')
| -rw-r--r-- | drivers/pinctrl/mediatek/pinctrl-paris.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c index b59e10852bfb..d3b34e9a7507 100644 --- a/drivers/pinctrl/mediatek/pinctrl-paris.c +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c @@ -20,12 +20,14 @@ #define MTK_PIN_CONFIG_RDSEL (PIN_CONFIG_END + 2) #define MTK_PIN_CONFIG_PU_ADV (PIN_CONFIG_END + 3) #define MTK_PIN_CONFIG_PD_ADV (PIN_CONFIG_END + 4) +#define MTK_PIN_CONFIG_DRV_ADV (PIN_CONFIG_END + 5) static const struct pinconf_generic_params mtk_custom_bindings[] = { {"mediatek,tdsel", MTK_PIN_CONFIG_TDSEL, 0}, {"mediatek,rdsel", MTK_PIN_CONFIG_RDSEL, 0}, {"mediatek,pull-up-adv", MTK_PIN_CONFIG_PU_ADV, 1}, {"mediatek,pull-down-adv", MTK_PIN_CONFIG_PD_ADV, 1}, + {"mediatek,drive-strength-adv", MTK_PIN_CONFIG_DRV_ADV, 2}, }; #ifdef CONFIG_DEBUG_FS @@ -34,6 +36,7 @@ static const struct pin_config_item mtk_conf_items[] = { PCONFDUMP(MTK_PIN_CONFIG_RDSEL, "rdsel", NULL, true), PCONFDUMP(MTK_PIN_CONFIG_PU_ADV, "pu-adv", NULL, true), PCONFDUMP(MTK_PIN_CONFIG_PD_ADV, "pd-adv", NULL, true), + PCONFDUMP(MTK_PIN_CONFIG_DRV_ADV, "drive-strength-adv", NULL, true), }; #endif @@ -176,6 +179,15 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev, return -ENOTSUPP; } break; + case MTK_PIN_CONFIG_DRV_ADV: + if (hw->soc->adv_drive_get) { + err = hw->soc->adv_drive_get(hw, desc, &ret); + if (err) + return err; + } else { + return -ENOTSUPP; + } + break; default: return -ENOTSUPP; } @@ -311,6 +323,15 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, return -ENOTSUPP; } break; + case MTK_PIN_CONFIG_DRV_ADV: + if (hw->soc->adv_drive_set) { + err = hw->soc->adv_drive_set(hw, desc, arg); + if (err) + return err; + } else { + return -ENOTSUPP; + } + break; default: err = -ENOTSUPP; } |