linux-kernel - Re: [PATCH V3 3/3] pci: imx: Select RESET

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Date:   Wed, 29 Jul 2020 17:47:51 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Rob Herring <robh@...nel.org>, Anson Huang <Anson.Huang@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Yang-Leo Li <leoyang.li@....com>, Vinod <vkoul@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Olof Johansson <olof@...om.net>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Thierry Reding <treding@...dia.com>,
        Vidya Sagar <vidyas@...dia.com>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Jonathan Chocron <jonnyc@...zon.com>,
        Dilip Kota <eswara.kota@...ux.intel.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        PCI <linux-pci@...r.kernel.org>,
        NXP Linux Team <Linux-imx@....com>
Subject: Re: [PATCH V3 3/3] pci: imx: Select RESET_IMX7 by default

On Wed, 2020-07-29 at 09:26 -0600, Rob Herring wrote:
> On Mon, Jul 20, 2020 at 8:26 AM Anson Huang <Anson.Huang@....com> wrote:
> > i.MX7 reset driver now supports module build and it is no longer
> > built in by default, so i.MX PCI driver needs to select it explicitly
> > due to it is NOT supporting loadable module currently.
> > 
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > ---
> > No change.
> > ---
> >  drivers/pci/controller/dwc/Kconfig | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
> > index 044a376..bcf63ce 100644
> > --- a/drivers/pci/controller/dwc/Kconfig
> > +++ b/drivers/pci/controller/dwc/Kconfig
> > @@ -90,6 +90,7 @@ config PCI_EXYNOS
> > 
> >  config PCI_IMX6
> >         bool "Freescale i.MX6/7/8 PCIe controller"
> > +       select RESET_IMX7
> 
> This will break as select will not cause all of RESET_IMX7's
> dependencies to be met. It also doesn't scale. Are you going to do the
> same thing for clocks, pinctrl, gpio, etc.?
> 
> You should make the PCI driver work as a module.

Oh, also PCI_IMX6 is used on (surprise) i.MX6, which doesn't need
RESET_IMX7 at all.

How about hiding the RESET_IMX7 option and setting it default y if
PCI_IMX6 is enabled, as an interim solution?

regards
Philipp