Re: [PATCH] pinctrl: add drive for I2C related pins on MT8183

From: Zhiyong Tao
Date: Fri Jan 04 2019 - 03:48:35 EST

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On Wed, 2018-12-12 at 04:51 +0800, Sean Wang wrote:
> The subject should be refined to be close to the content
>
> On Tue, Dec 11, 2018 at 12:02 AM Zhiyong Tao <zhiyong.tao@xxxxxxxxxxxx> wrote:
> >
> > This patch provides the advanced drive for I2C used pins on MT8183.
> >
>
> Additionally, you should state more how much strength in mA given on
> each step E1, E0 move forward. This way would help to reuse the scheme
> on the similar SoCs.

==>
Hi sean,
Thanks for your suggestion.
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;
we will add it in the commit message in the next version.

Thanks.
>
> > Signed-off-by: Zhiyong Tao <zhiyong.tao@xxxxxxxxxxxx>
> > ---
> > drivers/pinctrl/mediatek/pinctrl-mt8183.c | 50 ++++++++++++++++++++++++
> > drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 45 +++++++++++++++++++++
> > drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h | 13 ++++++
> > drivers/pinctrl/mediatek/pinctrl-paris.c | 20 ++++++++++
> > 4 files changed, 128 insertions(+)
> >
> > diff --git a/drivers/pinctrl/mediatek/pinctrl-mt8183.c b/drivers/pinctrl/mediatek/pinctrl-mt8183.c
> > index 6262fd3678ea..5244e1b27b1d 100644
> > --- a/drivers/pinctrl/mediatek/pinctrl-mt8183.c
> > +++ b/drivers/pinctrl/mediatek/pinctrl-mt8183.c
> > @@ -472,6 +472,51 @@ static const struct mtk_pin_field_calc mt8183_pin_r1_range[] = {
> > PIN_FIELD_BASE(133, 133, 8, 0x0D0, 0x10, 13, 1),
> > };
> >
> > +static const struct mtk_pin_field_calc mt8183_pin_drv_en_dis_range[] = {
>
> I'd prefer using the word mt8183_pin_e1e0en_range to keep people away from
> be confused the relationship with the existing mt8183_pin_drv_range.
>
> > + PIN_FIELD_BASE(48, 48, 3, 0x0F0, 0x10, 20, 1),
> > + PIN_FIELD_BASE(49, 49, 3, 0x0F0, 0x10, 15, 1),
> > + PIN_FIELD_BASE(50, 50, 4, 0x0F0, 0x10, 12, 1),
> > + PIN_FIELD_BASE(51, 51, 4, 0x0F0, 0x10, 7, 1),
> > + PIN_FIELD_BASE(81, 81, 5, 0x0F0, 0x10, 12, 1),
> > + PIN_FIELD_BASE(82, 82, 5, 0x0F0, 0x10, 9, 1),
> > + PIN_FIELD_BASE(83, 83, 5, 0x0F0, 0x10, 19, 1),
> > + PIN_FIELD_BASE(84, 84, 5, 0x0F0, 0x10, 22, 1),
> > + PIN_FIELD_BASE(103, 103, 6, 0x0F0, 0x10, 24, 1),
> > + PIN_FIELD_BASE(104, 104, 6, 0x0F0, 0x10, 14, 1),
> > + PIN_FIELD_BASE(105, 105, 6, 0x0F0, 0x10, 27, 1),
> > + PIN_FIELD_BASE(106, 106, 6, 0x0F0, 0x10, 17, 1),
> > +};
> > +
> > +static const struct mtk_pin_field_calc mt8183_pin_drv_e0_range[] = {
>
> Ditto, I'd prefer using the word mt8183_pin_e0_range
>
> > + PIN_FIELD_BASE(48, 48, 3, 0x0F0, 0x10, 21, 1),
> > + PIN_FIELD_BASE(49, 49, 3, 0x0F0, 0x10, 16, 1),
> > + PIN_FIELD_BASE(50, 50, 4, 0x0F0, 0x10, 13, 1),
> > + PIN_FIELD_BASE(51, 51, 4, 0x0F0, 0x10, 8, 1),
> > + PIN_FIELD_BASE(81, 81, 5, 0x0F0, 0x10, 13, 1),
> > + PIN_FIELD_BASE(82, 82, 5, 0x0F0, 0x10, 10, 1),
> > + PIN_FIELD_BASE(83, 83, 5, 0x0F0, 0x10, 20, 1),
> > + PIN_FIELD_BASE(84, 84, 5, 0x0F0, 0x10, 23, 1),
> > + PIN_FIELD_BASE(103, 103, 6, 0x0F0, 0x10, 25, 1),
> > + PIN_FIELD_BASE(104, 104, 6, 0x0F0, 0x10, 15, 1),
> > + PIN_FIELD_BASE(105, 105, 6, 0x0F0, 0x10, 28, 1),
> > + PIN_FIELD_BASE(106, 106, 6, 0x0F0, 0x10, 18, 1),
> > +};
> > +
> > +static const struct mtk_pin_field_calc mt8183_pin_drv_e1_range[] = {
>
> Ditto, I'd prefer using the word mt8183_pin_e1_range
>
> > + PIN_FIELD_BASE(48, 48, 3, 0x0F0, 0x10, 22, 1),
> > + PIN_FIELD_BASE(49, 49, 3, 0x0F0, 0x10, 17, 1),
> > + PIN_FIELD_BASE(50, 50, 4, 0x0F0, 0x10, 14, 1),
> > + PIN_FIELD_BASE(51, 51, 4, 0x0F0, 0x10, 9, 1),
> > + PIN_FIELD_BASE(81, 81, 5, 0x0F0, 0x10, 14, 1),
> > + PIN_FIELD_BASE(82, 82, 5, 0x0F0, 0x10, 11, 1),
> > + PIN_FIELD_BASE(83, 83, 5, 0x0F0, 0x10, 21, 1),
> > + PIN_FIELD_BASE(84, 84, 5, 0x0F0, 0x10, 24, 1),
> > + PIN_FIELD_BASE(103, 103, 6, 0x0F0, 0x10, 26, 1),
> > + PIN_FIELD_BASE(104, 104, 6, 0x0F0, 0x10, 16, 1),
> > + PIN_FIELD_BASE(105, 105, 6, 0x0F0, 0x10, 29, 1),
> > + PIN_FIELD_BASE(106, 106, 6, 0x0F0, 0x10, 19, 1),
> > +};
> > +
> > static const struct mtk_pin_reg_calc mt8183_reg_cals[PINCTRL_PIN_REG_MAX] = {
> > [PINCTRL_PIN_REG_MODE] = MTK_RANGE(mt8183_pin_mode_range),
> > [PINCTRL_PIN_REG_DIR] = MTK_RANGE(mt8183_pin_dir_range),
> > @@ -485,6 +530,9 @@ static const struct mtk_pin_reg_calc mt8183_reg_cals[PINCTRL_PIN_REG_MAX] = {
> > [PINCTRL_PIN_REG_PUPD] = MTK_RANGE(mt8183_pin_pupd_range),
> > [PINCTRL_PIN_REG_R0] = MTK_RANGE(mt8183_pin_r0_range),
> > [PINCTRL_PIN_REG_R1] = MTK_RANGE(mt8183_pin_r1_range),
> > + [PINCTRL_PIN_REG_DRV_EN_DIS] = MTK_RANGE(mt8183_pin_drv_en_dis_range),
> > + [PINCTRL_PIN_REG_DRV_E0] = MTK_RANGE(mt8183_pin_drv_e0_range),
> > + [PINCTRL_PIN_REG_DRV_E1] = MTK_RANGE(mt8183_pin_drv_e1_range),
> > };
> >
> > static const char * const mt8183_pinctrl_register_base_names[] = {
> > @@ -517,6 +565,8 @@ static const struct mtk_pin_soc mt8183_data = {
> > .drive_get = mtk_pinconf_drive_get_rev1,
> > .adv_pull_get = mtk_pinconf_adv_pull_get,
> > .adv_pull_set = mtk_pinconf_adv_pull_set,
> > + .adv_drive_get = mtk_pinconf_adv_drive_get,
> > + .adv_drive_set = mtk_pinconf_adv_drive_set,
>
> DT property drive-strength is generic enough to all SoCs so we don't
> need to create extra callbacks to serve the extra property about the
> driving adjustment.
>
> And DRV register working for i2c pins 48-51, 81-84 and 103-106 implies
> that E1 and E0 work like more an extra fine adjustment related to DRV
> register have done to give more accurate strength than only DRV
> register can support. Thus, DRV, E0, and E1 should be more
> consolidated to in the same function instead of making them apart.
>
> If we know how much driving strength on each step of e1, e0, it would
> be easy to add E1 and E0 support into current driving adjustment
> procedure mtk_pinconf_drive_set_rev1 and mtk_pinconf_drive_get_rev1.
>
> > };
> >
> > static const struct of_device_id mt8183_pinctrl_of_match[] = {
> > diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> > index 4a9e0d4c2bbc..da024279ec59 100644
> > --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> > +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> > @@ -668,3 +668,48 @@ int mtk_pinconf_adv_pull_get(struct mtk_pinctrl *hw,
> >
> > return 0;
> > }
> > +
> > +int mtk_pinconf_adv_drive_set(struct mtk_pinctrl *hw,
> > + const struct mtk_pin_desc *desc, bool enable,
> > + u32 arg)
> > +{
> > + int err;
> > +
> > + err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_E0, arg & 1);
> > + if (err)
> > + return 0;
> > +
> > + err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_E1,
> > + !!(arg & 2));
> > + if (err)
> > + return 0;
> > +
> > + arg = enable ? 1 : 0;
> > +
> > + err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DRV_EN_DIS, arg);
> > +
> > + return err;
> > +}
> > +
> > +int mtk_pinconf_adv_drive_get(struct mtk_pinctrl *hw,
> > + const struct mtk_pin_desc *desc, u32 *val)
> > +{
> > + u32 en, e0, e1;
> > + int err;
> > +
> > + err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_EN_DIS, &en);
> > + if (err)
> > + return err;
> > +
> > + err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_E0, &e0);
> > + if (err)
> > + return err;
> > +
> > + err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DRV_E1, &e1);
> > + if (err)
> > + return err;
> > +
> > + *val = (e0 | e1 << 1 | en << 2) & 0x7;
> > +
> > + return 0;
> > +}
> > diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
> > index 6d24522739d9..795a3b10d54e 100644
> > --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
> > +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
> > @@ -63,6 +63,9 @@ enum {
> > PINCTRL_PIN_REG_IES,
> > PINCTRL_PIN_REG_PULLEN,
> > PINCTRL_PIN_REG_PULLSEL,
> > + PINCTRL_PIN_REG_DRV_EN_DIS,
> > + PINCTRL_PIN_REG_DRV_E0,
> > + PINCTRL_PIN_REG_DRV_E1,
> > PINCTRL_PIN_REG_MAX,
> > };
> >
> > @@ -224,6 +227,11 @@ struct mtk_pin_soc {
> > int (*adv_pull_get)(struct mtk_pinctrl *hw,
> > const struct mtk_pin_desc *desc, bool pullup,
> > u32 *val);
> > + int (*adv_drive_set)(struct mtk_pinctrl *hw,
> > + const struct mtk_pin_desc *desc, bool enable,
> > + u32 arg);
> > + int (*adv_drive_get)(struct mtk_pinctrl *hw,
> > + const struct mtk_pin_desc *desc, u32 *val);
> >
> > /* Specific driver data */
> > void *driver_data;
> > @@ -287,5 +295,10 @@ int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw,
> > int mtk_pinconf_adv_pull_get(struct mtk_pinctrl *hw,
> > const struct mtk_pin_desc *desc, bool pullup,
> > u32 *val);
> > +int mtk_pinconf_adv_drive_set(struct mtk_pinctrl *hw,
> > + const struct mtk_pin_desc *desc, bool enable,
> > + u32 arg);
> > +int mtk_pinconf_adv_drive_get(struct mtk_pinctrl *hw,
> > + const struct mtk_pin_desc *desc, u32 *val);
> >
> > #endif /* __PINCTRL_MTK_COMMON_V2_H */
> > diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
> > index d2179028f134..ef4ccaa59e55 100644
> > --- a/drivers/pinctrl/mediatek/pinctrl-paris.c
> > +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
> > @@ -20,12 +20,16 @@
> > #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_EN_ADV (PIN_CONFIG_END + 5)
> > +#define MTK_PIN_CONFIG_DRV_DIS_ADV (PIN_CONFIG_END + 6)
> >
> > 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-enable-adv", MTK_PIN_CONFIG_DRV_EN_ADV, 2},
> > + {"mediatek,drive-disable-adv", MTK_PIN_CONFIG_DRV_DIS_ADV, 2},
> > };
> >
> > #ifdef CONFIG_DEBUG_FS
> > @@ -34,6 +38,8 @@ 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_EN_ADV, "drive-enable-adv", NULL, true),
> > + PCONFDUMP(MTK_PIN_CONFIG_DRV_DIS_ADV, "drive-disable-adv", NULL, true),
> > };
> > #endif
> >
> > @@ -311,6 +317,20 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
> > return -ENOTSUPP;
> > }
> > break;
> > + case MTK_PIN_CONFIG_DRV_EN_ADV:
> > + case MTK_PIN_CONFIG_DRV_DIS_ADV:
> > + if (hw->soc->adv_drive_set) {
> > + bool enable;
> > +
> > + enable = param == MTK_PIN_CONFIG_DRV_EN_ADV;
> > + err = hw->soc->adv_drive_set(hw, desc, enable,
> > + arg);
> > + if (err)
> > + return err;
> > + } else {
> > + return -ENOTSUPP;
> > + }
> > + break;
> > default:
> > err = -ENOTSUPP;
> > }
> > --
> > 2.12.5
> >
> >
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek

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Next in thread: Sean Wang: "Re: [PATCH] pinctrl: add drive for I2C related pins on MT8183"
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