Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20210210132751.1422386-1-geert+renesas@glider.be>
 <87mtwcujd0.fsf@microchip.com> <CAMuHMdVpHUmwfob6t_aWvaVVHpSDpF5HvLe_W5+KY9ky5A-qEw@mail.gmail.com>
 <20210210141728.GO351084@piout.net> <CAMuHMdXWVYB0vZ9Q3G9jGAv3J8nDReKzgSmDj4ykny6rH1cKGw@mail.gmail.com>
 <87lfbwuhk3.fsf@microchip.com>
In-Reply-To: <87lfbwuhk3.fsf@microchip.com>
From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Wed, 10 Feb 2021 15:28:16 +0100
Message-ID: <CAMuHMdXVob60P+RXv3i-2-h6FRksSsfgc+2vmX1PfXtCZh26-g@mail.gmail.com>
Subject: Re: [PATCH] pinctrl: PINCTRL_MICROCHIP_SGPIO should depend on
 ARCH_SPARX5 || SOC_VCOREIII
To:     Lars Povlsen <lars.povlsen@microchip.com>
Cc:     Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Steen Hegelund <Steen.Hegelund@microchip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Hi Lars,

On Wed, Feb 10, 2021 at 3:24 PM Lars Povlsen <lars.povlsen@microchip.com> wrote:
> Geert Uytterhoeven writes:
> > On Wed, Feb 10, 2021 at 3:17 PM Alexandre Belloni
> > <alexandre.belloni@bootlin.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@microchip.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@glider.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...

OK, I'll drop this.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds