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

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Date:   Thu, 30 Jul 2020 09:19:20 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Anson Huang <anson.huang@....com>, 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 Anson,

On Thu, 2020-07-30 at 02:11 +0000, Anson Huang wrote:
> 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"

I was thinking something like

	tristate "i.MX7/8 Reset Driver" if COMPILE_TEST || !PCI_IMX6

>         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)

Yes, although without the above I think it could still be disabled
manually or via oldconfig.

regards
Philipp