Re: [PATCH] eint: add gpio vritual number select

Yingjoe Chen
2018-12-17T04:04:42Z

On Mon, 2018-12-17 at 11:15 +0800, Chuanjia Liu wrote:
> On Thu, 2018-12-13 at 11:33 -0800, Sean Wang wrote:
> > On Thu, Dec 13, 2018 at 1:36 AM <chuanjia.liu@mediatek.com> wrote:
> > >
> > > From: Chuanjia Liu <Chuanjia.Liu@mediatek.com>
> > >
> > > This patch add gpio vritual number select,avoid virtual gpio set SMT.
> >
> > s/gpio/GPIO/
> > s/vritual/virtual/
> >
> > Virtual GPIOs you said here that means these pins only used inside SoC
> > and not being exported to outside SoC, right? It seems this kind of
> > pins doesn't need SMT.
> >
> Yes,virtual gpio only used inside SOC and these pins doesn't need set
> SMT

Hi,

I don't see full patch in linux-mediatek archive. Maybe you are not
subscribed so it is rejected?

Please add this description to commit message and/or code comment.
I think 'internal GPIO' might be a better name for this. Does the name
'virtual GPIO' come from datasheet?

> > >
> > > Signed-off-by: Chuanjia Liu <Chuanjia.Liu@mediatek.com>
> > > ---
> > > drivers/pinctrl/mediatek/mtk-eint.h | 1 +
> > > drivers/pinctrl/mediatek/pinctrl-mt8183.c | 1 +
> > > drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 9 ++++++---
> > > 3 files changed, 8 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/pinctrl/mediatek/mtk-eint.h b/drivers/pinctrl/mediatek/mtk-eint.h
> > > index 48468d0..c16beaf 100644
> > > --- a/drivers/pinctrl/mediatek/mtk-eint.h
> > > +++ b/drivers/pinctrl/mediatek/mtk-eint.h
> > > @@ -37,6 +37,7 @@ struct mtk_eint_hw {
> > > u8 ports;
> > > unsigned int ap_num;
> > > unsigned int db_cnt;
> > > + unsigned int vir_start;

Since it is about GPIO and SMT, maybe it should be added to mtk_pin_soc
instead of mtk_eint_hw ?

Joe.C

> > > };
> > >
> > > struct mtk_eint;
> > > diff --git a/drivers/pinctrl/mediatek/pinctrl-mt8183.c b/drivers/pinctrl/mediatek/pinctrl-mt8183.c
> > > index 6262fd3..bbeafd3 100644
> > > --- a/drivers/pinctrl/mediatek/pinctrl-mt8183.c
> > > +++ b/drivers/pinctrl/mediatek/pinctrl-mt8183.c
> > > @@ -497,6 +497,7 @@
> > > .ports = 6,
> > > .ap_num = 212,
> > > .db_cnt = 13,
> > > + .vir_start = 180,
> > > };
> > >
> > > static const struct mtk_pin_soc mt8183_data = {
> > > diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> > > index 4a9e0d4..ca3bae1 100644
> > > --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> > > +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> > > @@ -289,9 +289,12 @@ static int mtk_xt_set_gpio_as_eint(void *data, unsigned long eint_n)
> > > if (err)
> > > return err;
> > >
> > > - err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, MTK_ENABLE);
> > > - if (err)
> > > - return err;
> > > + if (gpio_n < hw->eint->hw->vir_start) {
> > > + err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
> > > + MTK_ENABLE);
> > > + if (err)
> > > + return err;
> > > + }
> >
> > The changes will break these SoCs without a properly configured vir_start.
> >
> > If SMT seems unnecessary for these kinds of virtual GPIOs pin in the
> > path, we can do it as
> >
> > err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
> > MTK_ENABLE);
> > /* please add comments for the exclusion condition */
> > if (err && err != -ENOTSUPP)
> > return err;
> >
> > If there is getting much special on certain pins between SoCs, and
> > then we can consider creating a desc->flag to split logic.
>
> Yes,SMT unnecessary for these kinds of virtual GPIOS pin in the path,if
> do it as
> err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
> MTK_ENABLE);
> if (err && err != -ENOTSUPP)
> return err;
> I wonder if system will lose -ENOTSUPP information when smt was not
> successfully set by real gpio?
> >
> > >
> > > return 0;
> > > }
> > > --
> > > 1.7.9.5
>
>
>
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