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Date: Wed, 2 Aug 2017 14:03:57 +0800
From: Zhiyong Tao <zhiyong.tao@...iatek.com>
To: Yingjoe Chen <yingjoe.chen@...iatek.com>
CC: <robh+dt@...nel.org>, <linus.walleij@...aro.org>,
<mark.rutland@....com>, <matthias.bgg@...il.com>,
<srv_heupstream@...iatek.com>, <liguo.zhang@...iatek.com>,
<hongkun.cao@...iatek.com>, <biao.huang@...iatek.com>,
<yt.shen@...iatek.com>, <hongzhou.yang@...iatek.com>,
<erin.lo@...iatek.com>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>, <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 3/3] pinctrl: add mt2712 pinctrl driver
On Tue, 2017-08-01 at 17:14 +0800, Yingjoe Chen wrote:
>
> Hi Zhiyong,
>
>
>
> On Mon, 2017-07-31 at 16:22 +0800, Zhiyong Tao wrote:
> <...>
> > 3)Add "spec_dir_set" and "spec_dir_get" in "mtk_pinctrl_devdata".
> > 4)Change "spec_dir_set" and add "spec_dir_get" in "pinctrl-mt2701.c"
> > and "pinctrl-mtk-common.c".
>
> I think these deserve another patch.
> Please also explain why we need this.
==> ok, I will separate it in another patch in the next version.
Because we should control another gpio base register for gpio16 and 17
in mt2712 E1. It is special for the direction control in gpio16 and
gpio17.
>
>
> > 5)Change "port_mask" from "7" to "6" for EINT.
>
> I'm assuming this is a bug fix for mt2701?
> If yes, this should be a separate patch.
==> yes, it is a bug fix for mt2701. When I use EINT bothe edge triggle,
offset can't get the offset address which offset address is 1/3/5/7.
I will separate it in another patch in the next version.
>
> > 6)Remove generic pull config condition in "mtk_pconf_set_pull_select".
> > 7)Change "arg" to "MTK_PUPD_SET_R1R0_00" of "mtk_pconf_set_pull_select".
>
> Why we need to change arg?
==> to parse the "bias-disable" property in dts for special pins.
>
>
> >
> > Signed-off-by: Zhiyong Tao <zhiyong.tao@...iatek.com>
> > ---
> > drivers/pinctrl/mediatek/Kconfig | 8 +
> > drivers/pinctrl/mediatek/Makefile | 1 +
> > drivers/pinctrl/mediatek/pinctrl-mt2701.c | 21 +-
> > drivers/pinctrl/mediatek/pinctrl-mt2712.c | 670 +++++++++
> > drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 16 +-
> > drivers/pinctrl/mediatek/pinctrl-mtk-common.h | 44 +-
> > drivers/pinctrl/mediatek/pinctrl-mtk-mt2712.h | 1858 +++++++++++++++++++++++++
> > 7 files changed, 2586 insertions(+), 32 deletions(-)
> > create mode 100644 drivers/pinctrl/mediatek/pinctrl-mt2712.c
> > create mode 100644 drivers/pinctrl/mediatek/pinctrl-mtk-mt2712.h
> >
>
> <...>
>
> > diff --git a/drivers/pinctrl/mediatek/pinctrl-mt2701.c b/drivers/pinctrl/mediatek/pinctrl-mt2701.c
> > index f86f3b3..4a43f5c 100644
> > --- a/drivers/pinctrl/mediatek/pinctrl-mt2701.c
> > +++ b/drivers/pinctrl/mediatek/pinctrl-mt2701.c
> > @@ -503,10 +503,26 @@ static void mt2701_spec_pinmux_set(struct regmap *reg, unsigned int pin,
> > regmap_update_bits(reg, mt2701_spec_pinmux[i].offset, mask, value);
> > }
> >
> > -static void mt2701_spec_dir_set(unsigned int *reg_addr, unsigned int pin)
> > +static int mt2701_spec_dir_set(struct mtk_pinctrl *pctl,
> > + unsigned int *reg_addr,
> > + unsigned int pin,
> > + bool input)
> > {
> > if (pin > 175)
> > *reg_addr += 0x10;
> > +
> > + return 0;
> > +}
> > +
> > +static int mt2701_spec_dir_get(struct mtk_pinctrl *pctl,
> > + unsigned int *reg_addr,
> > + unsigned int pin,
> > + bool input)
>
> incorrect prototype?
>
> > +{
> > + if (pin > 175)
> > + *reg_addr += 0x10;
> > +
> > + return 0;
> > }
> >
> > static const struct mtk_pinctrl_devdata mt2701_pinctrl_data = {
> > @@ -520,6 +536,7 @@ static void mt2701_spec_dir_set(unsigned int *reg_addr, unsigned int pin)
> > .spec_ies_smt_set = mt2701_ies_smt_set,
> > .spec_pinmux_set = mt2701_spec_pinmux_set,
> > .spec_dir_set = mt2701_spec_dir_set,
> > + .spec_dir_get = mt2701_spec_dir_get,
> > .dir_offset = 0x0000,
> > .pullen_offset = 0x0150,
> > .pullsel_offset = 0x0280,
> > @@ -551,7 +568,7 @@ static void mt2701_spec_dir_set(unsigned int *reg_addr, unsigned int pin)
> > .dbnc_ctrl = 0x500,
> > .dbnc_set = 0x600,
> > .dbnc_clr = 0x700,
> > - .port_mask = 6,
> > + .port_mask = 7,
> > .ports = 6,
> > },
> > .ap_num = 169,
> > diff --git a/drivers/pinctrl/mediatek/pinctrl-mt2712.c b/drivers/pinctrl/mediatek/pinctrl-mt2712.c
> > new file mode 100644
> > index 0000000..c933b75
> > --- /dev/null
> > +++ b/drivers/pinctrl/mediatek/pinctrl-mt2712.c
>
> <...>
>
> > +
> > +static int mt2712_spec_dir_set(struct mtk_pinctrl *pctl,
> > + unsigned int *reg_addr,
> > + unsigned int pin,
> > + bool input)
> > +{
> > + u32 reg_val;
> > +
> > + if (pin == 16) {
> > + regmap_read(pctl->regmap2, 0x940, ®_val);
> > + reg_val |= BIT(15);
> > + if (input == true)
> > + reg_val &= ~BIT(14);
> > + else
> > + reg_val |= BIT(14);
> > + regmap_write(pctl->regmap2, 0x940, reg_val);
> > + }
> > +
> > + if (pin == 17) {
> > + regmap_read(pctl->regmap2, 0x940, ®_val);
> > + reg_val |= BIT(7);
> > + if (input == true)
> > + reg_val &= ~BIT(6);
> > + else
> > + reg_val |= BIT(6);
> > + regmap_write(pctl->regmap2, 0x940, reg_val);
> > + }
> > +
> > + return 0;
> > +}
>
> Does this means pin 16, 17 is in different/special reg/bit location?
> I didn't see spec_dir_get in your patch, does this means they are in
> standard location or you just forgot it?
>
> The original idea of spec_dir_set is to get the register offset for the
> pin, so both set_direction and get_direction are using the same
> extension function. Instead of adding a new spec_dir_get, can we just
> extend the function to also include bit location?
==> In mt2712 E1 gpi16 and gpio17 direction control is special. The
based register is different. so we add "struct mtk_pinctrl *pctl"
parameter to get the regmap2. The direction status is also different.
we forgot to add spec_dir_get, we will add it in the next version.
>
>
>
> <...>
>
> > diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> > index 3cf384f..aeec87e 100644
> > --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> > +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> > @@ -84,7 +84,7 @@ static int mtk_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
> > bit = BIT(offset & 0xf);
> >
> > if (pctl->devdata->spec_dir_set)
> > - pctl->devdata->spec_dir_set(®_addr, offset);
> > + pctl->devdata->spec_dir_set(pctl, ®_addr, offset, input);
> >
> > if (input)
> > /* Different SoC has different alignment offset. */
> > @@ -307,13 +307,6 @@ static int mtk_pconf_set_pull_select(struct mtk_pinctrl *pctl,
> > return 0;
> > }
> >
> > - /* For generic pull config, default arg value should be 0 or 1. */
> > - if (arg != 0 && arg != 1) {
> > - dev_err(pctl->dev, "invalid pull-up argument %d on pin %d .\n",
> > - arg, pin);
> > - return -EINVAL;
> > - }
> > -
>
>
> Why we need to remove this?
==> In order to parse "bias-disable" property. we change "arg" to
"MTK_PUPD_SET_R1R0_00". for normal pins, If we don't remove it.
It will return here.
>
> > bit = BIT(pin & 0xf);
> > if (enable)
> > reg_pullen = SET_ADDR(mtk_get_port(pctl, pin) +
> > @@ -343,7 +336,8 @@ static int mtk_pconf_parse_conf(struct pinctrl_dev *pctldev,
> >
> > switch (param) {
> > case PIN_CONFIG_BIAS_DISABLE:
> > - ret = mtk_pconf_set_pull_select(pctl, pin, false, false, arg);
> > + ret = mtk_pconf_set_pull_select(pctl, pin, false, false,
> > + MTK_PUPD_SET_R1R0_00);
>
> Why we need to change this?
>
==> if only just add "bias-disable" property in dts. "arg" is 0 or 1,
It can't to parse the "bias-disable" property. so we change it to
"MTK_PUPD_SET_R1R0_00".
> Joe.C
>
>
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