linux-kernel - Re: [PATCH] pinctrl: Add kernel config PINCTRL_MTK

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Date:   Fri, 12 Apr 2019 09:58:13 +0800
From:   Light Hsieh <light.hsieh@...iatek.com>
To:     Sean Wang <sean.wang@...nel.org>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-gpio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <wsd_upstream@...iatek.com>
Subject: Re: [PATCH] pinctrl: Add kernel config PINCTRL_MTK_V2

Dear reviewer,

The points of  Sean are right. Please forget this patch proposal.


On Thu, 2019-04-11 at 15:04 -0700, Sean Wang wrote:
> Hi, Light
> 
> On Thu, Apr 11, 2019 at 2:32 AM Light Hsieh <light.hsieh@...iatek.com> wrote:
> >
> > Since no single Mediatek chip use code for PINCTRL_MTK and code for
> > PINCTRL_MTK_MOORE/PINCTRL_MTK_PARIS simultaneously, it is better to use
> > different config to determine if related code will be built or not on
> > building non-generic kernel.
> >
> > Add kernel config PINCTRL_MTK_V2 selected by either PINCTRL_MTK_MOORE
> > or PINCTRL_MTK_PARIS.
> > Use PINCTRL_MTK and PINCTRL_MTK_V2 to control building of
> > drivers/pinctrl/medaitek/.
> > Remove selection of EINT_MTK from PINCTRL_MTK since code for EINT_MTK is
> > only related to PINCTRL_MTK_MOORE/PINCTRL_MTK_PARIS, i.e. PINCTL_MTK_V2.
> >
> 
> PINCTRL_MTK also depends on EINT_MTK such as the symbol
> mtk_eint_do_init, it is a commonlibrary for the two kinds of the
> pinctrl core.
> 

Yes, you are right. 
It is my fault that I don't see some mtk_eint_* functions originally in
pinctrl-mtk-common.c had been moved to mtk-eint.c since kernel-4.18 and
now pinctrl-mtk-common.c depends on mtk-eint.c.

> > ---
> >  drivers/pinctrl/Makefile         |  3 ++-
> >  drivers/pinctrl/mediatek/Kconfig | 15 ++++++++++++---
> >  2 files changed, 14 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
> > index 712184b..fcee0e0 100644
> > --- a/drivers/pinctrl/Makefile
> > +++ b/drivers/pinctrl/Makefile
> > @@ -65,6 +65,7 @@ obj-$(CONFIG_PINCTRL_SUNXI)   += sunxi/
> >  obj-y                          += ti/
> >  obj-$(CONFIG_PINCTRL_UNIPHIER) += uniphier/
> >  obj-$(CONFIG_ARCH_VT8500)      += vt8500/
> > -obj-y                          += mediatek/
> > +obj-$(CONFIG_PINCTRL_MTK)      += mediatek/
> > +obj-$(CONFIG_PINCTRL_MTK_V2)   += mediatek/
> 
> I would think it is good if deciding V1 or not should be done inside
> the vendor directory and the change also would cause COMPILE_TEST not
> be applied to

Agree.

> >  obj-$(CONFIG_PINCTRL_ZX)       += zte/
> >  obj-y                          += cirrus/
> > diff --git a/drivers/pinctrl/mediatek/Kconfig b/drivers/pinctrl/mediatek/Kconfig
> > index a005cbc..5e26462 100644
> > --- a/drivers/pinctrl/mediatek/Kconfig
> > +++ b/drivers/pinctrl/mediatek/Kconfig
> > @@ -2,10 +2,15 @@ menu "MediaTek pinctrl drivers"
> >         depends on ARCH_MEDIATEK || COMPILE_TEST
> >
> >  config EINT_MTK
> > -       bool "MediaTek External Interrupt Support"
> > -       depends on PINCTRL_MTK || PINCTRL_MTK_MOORE || PINCTRL_MTK_PARIS || COMPILE_TEST
> > +       bool "MediaTek External Interrupt driver that is based on PINCTRL_MTK_V2"
> > +       depends on PINCTRL_MTK_MOORE || PINCTRL_MTK_PARIS || COMPILE_TEST
> >         select GPIOLIB
> >         select IRQ_DOMAIN
> > +       help
> > +         Say yes here to enable support for MediaTek External Interrupt
> > +         (EINT) driver based on PINCTRL_MTK version 2.
> > +         This driver is combined with MediaTek Pinctrl driver version 2
> > +         so PINCTRL_MTK_V2 shall be set first.
> >
> >  config PINCTRL_MTK
> >         bool
> > @@ -13,9 +18,11 @@ config PINCTRL_MTK
> >         select PINMUX
> >         select GENERIC_PINCONF
> >         select GPIOLIB
> > -       select EINT_MTK
> >         select OF_GPIO
> >
> > +config PINCTRL_MTK_V2
> > +       bool "MediaTek Pinctrl Support V2"
> > +
> >  config PINCTRL_MTK_MOORE
> >         bool
> >         depends on OF
> > @@ -24,6 +31,7 @@ config PINCTRL_MTK_MOORE
> >         select GENERIC_PINMUX_FUNCTIONS
> >         select GPIOLIB
> >         select OF_GPIO
> > +       select PINCTRL_MTK_V2
> >
> >  config PINCTRL_MTK_PARIS
> >         bool
> > @@ -33,6 +41,7 @@ config PINCTRL_MTK_PARIS
> >         select GPIOLIB
> >         select EINT_MTK
> >         select OF_GPIO
> > +       select PINCTRL_MTK_V2
> >
> >  # For ARMv7 SoCs
> >  config PINCTRL_MT2701
> > --
> > 1.8.1.1.dirty
> >