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

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Message-ID: <DB3PR0402MB391605E5B4F5E03F1E27B67DF5710@DB3PR0402MB3916.eurprd04.prod.outlook.com>
Date:   Thu, 30 Jul 2020 02:11:02 +0000
From:   Anson Huang <anson.huang@....com>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh@...nel.org>
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>,
        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>, dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V3 3/3] pci: imx: Select RESET_IMX7 by default

Hi, Philipp/Rob


> 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?

Like below, RESET_IMX7 is already default y when SOC_IMX7D, now added PCI_IMX6,
let me know if it is OK for you, then I will send new patch for review.

+++ b/drivers/reset/Kconfig
@@ -68,7 +68,7 @@ config RESET_IMX7
        tristate "i.MX7/8 Reset Driver"
        depends on HAS_IOMEM
        depends on SOC_IMX7D || (ARM64 && ARCH_MXC) || COMPILE_TEST
-       default y if SOC_IMX7D
+       default y if (SOC_IMX7D || PCI_IMX6)

Thanks,
Anson