linux-kernel - Re: [PATCH] pinctrl: PINCTRL_MICROCHIP_SGPIO should depend on ARCH_SPARX5 || SOC

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Date:   Wed, 10 Feb 2021 15:24:28 +0100
From:   Lars Povlsen <lars.povlsen@...rochip.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Steen Hegelund" <Steen.Hegelund@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: PINCTRL_MICROCHIP_SGPIO should depend on ARCH_SPARX5 || SOC_VCOREIII


Geert Uytterhoeven writes:

> Hi Alexandre,
>
> On Wed, Feb 10, 2021 at 3:17 PM Alexandre Belloni
> <alexandre.belloni@...tlin.com> wrote:
>> On 10/02/2021 14:53:01+0100, Geert Uytterhoeven wrote:
>> > On Wed, Feb 10, 2021 at 2:45 PM Lars Povlsen <lars.povlsen@...rochip.com> wrote:
>> > > Geert Uytterhoeven writes:
>> > > > the Microsemi/Microchip Serial GPIO device is present only Microsemi
>> > > > VCore III and Microchip Sparx5 SoCs.  Hence add a dependency on
>> > > > ARCH_SPARX5 || SOC_VCOREIII, to prevent asking the user about this
>> > > > driver when configuring a kernel without support for these SoCs.
>> > > >
>> > > > Fixes: 7e5ea974e61c8dd0 ("pinctrl: pinctrl-microchip-sgpio: Add pinctrl driver for Microsemi Serial GPIO")
>> > > > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>> > > > ---
>> > > >  drivers/pinctrl/Kconfig | 4 ++--
>> > > >  1 file changed, 2 insertions(+), 2 deletions(-)
>> > > >
>> > > > diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
>> > > > index 113073d5f89bbf70..3b75b1d7d3d1f1b0 100644
>> > > > --- a/drivers/pinctrl/Kconfig
>> > > > +++ b/drivers/pinctrl/Kconfig
>> > > > @@ -353,8 +353,8 @@ config PINCTRL_OCELOT
>> > > >
>> > > >  config PINCTRL_MICROCHIP_SGPIO
>> > > >         bool "Pinctrl driver for Microsemi/Microchip Serial GPIO"
>> > > > -       depends on OF
>> > > > -       depends on HAS_IOMEM
>> > > > +       depends on OF && HAS_IOMEM
>> > > > +       depends on ARCH_SPARX5 || SOC_VCOREIII || COMPILE_TEST
>> > > >         select GPIOLIB
>> > > >         select GPIOLIB_IRQCHIP
>> > > >         select GENERIC_PINCONF
>> > >
>> > > Thank you for your patch. Unfortunately, it makes it impossible to use
>> > > the driver across PCIe - which is a specifically desired configuration.
>> > >
>> > > Could you add CONFIG_PCI to the || chain?
>> >
>> > Sure.
>> >
>> > Is PCIe the only other transport over which the register can be accessed?
>> > Or can this also be done over e.g. SPI, like on Ocelot[1]?
>> >
>> > [1] https://lore.kernel.org/linux-gpio/20200511145329.GV34497@piout.net/
>> >
>>
>> Yes, this driver IP is also available on Ocelot (this is SOC_VCOREIII)
>> so this is also available over SPI.
>
> Hence would you consider
>
>     depends on ARCH_SPARX5 || SOC_VCOREIII || PCI || SPI || COMPILE_TEST
>
> acceptable?  Or would that be futile, as must systems have PCI and/or
> SPI enabled anyway?
>
> Gr{oetje,eeting}s,
>
>                         Geert

Yes, that would be fine, but as you say - not have a lot of impact.

Up to you...

---Lars

-- 
Lars Povlsen,
Microchip