linux-kernel - Re: [PATCH v3] ARC: [plat-hsdk]: Add reset controller node to manage ethernet reset

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Message-ID: <1506538500.30546.46.camel@synopsys.com>
Date:   Wed, 27 Sep 2017 18:55:01 +0000
From:   Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
To:     "Eugeniy.Paltsev@...opsys.com" <Eugeniy.Paltsev@...opsys.com>,
        "Vineet Gupta" <Vineet.Gupta1@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Alexey Brodkin" <Alexey.Brodkin@...opsys.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3] ARC: [plat-hsdk]: Add reset controller node to
 manage ethernet reset

On Wed, 2017-09-27 at 10:40 -0700, Vineet Gupta wrote:
> On 09/22/2017 09:49 AM, Eugeniy Paltsev wrote:
> > DW ethernet controller on HSDK hangs sometimes after SW reset, so
> > add reset node to make possible to reset DW ethernet controller HW.
> > 
> > Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
> > ---
> > Changes v2 -> v3:
> >    * Remove v1 suffix as we finaly got rid of v1 suffix in reset
> >      driver and docs.
> >    * Rename reset node to "reset-controller" for consistency with
> >      the other bindings.
> > 
> > Changes v1 -> v2:
> >    * Enable HSDK reset driver in hsdk_defconfig
> > 
> >   arch/arc/boot/dts/hsdk.dts      | 9 +++++++++
> >   arch/arc/configs/hsdk_defconfig | 1 +
> >   2 files changed, 10 insertions(+)
> > 
> > diff --git a/arch/arc/boot/dts/hsdk.dts b/arch/arc/boot/dts/hsdk.dts
> > index b922f3f..8adde1b 100644
> > --- a/arch/arc/boot/dts/hsdk.dts
> > +++ b/arch/arc/boot/dts/hsdk.dts
> > @@ -12,6 +12,7 @@
> >   /dts-v1/;
> >   
> >   #include <dt-bindings/net/ti-dp83867.h>
> > +#include <dt-bindings/reset/snps,hsdk-reset.h>
> >   
> >   / {
> >   	model = "snps,hsdk";
> > @@ -102,6 +103,12 @@
> >   
> >   		ranges = <0x00000000 0xf0000000 0x10000000>;
> >   
> > +		cgu_rst: reset-controller@8a0 {
> > +			compatible = "snps,hsdk-reset";
> > +			#reset-cells = <1>;
> > +			reg = <0x8A0 0x4>, <0xFF0 0x4>;
> > +		};
> > +
> >   		core_clk: core-clk@0 {
> >   			compatible = "snps,hsdk-core-pll-clock";
> >   			reg = <0x00 0x10>, <0x14B8 0x4>;
> > @@ -158,6 +165,8 @@
> >   			clocks = <&gmacclk>;
> >   			clock-names = "stmmaceth";
> >   			phy-handle = <&phy0>;
> > +			resets = <&cgu_rst HSDK_ETH_RESET>;
> > +			reset-names = "stmmaceth";
> >   
> >   			mdio {
> >   				#address-cells = <1>;
> > diff --git a/arch/arc/configs/hsdk_defconfig b/arch/arc/configs/hsdk_defconfig
> > index 7b8f8fa..15f0f6b 100644
> > --- a/arch/arc/configs/hsdk_defconfig
> > +++ b/arch/arc/configs/hsdk_defconfig
> > @@ -63,6 +63,7 @@ CONFIG_MMC_SDHCI=y
> >   CONFIG_MMC_SDHCI_PLTFM=y
> >   CONFIG_MMC_DW=y
> >   # CONFIG_IOMMU_SUPPORT is not set
> > +CONFIG_RESET_HSDK=y
> 
> Since we need this feature for our platform, better to just select it in Kconfig.
> I can fix it up here if you agree !

Sure, I'm fine with it.

> 
> -Vineet
> 
> >   CONFIG_EXT3_FS=y
> >   CONFIG_VFAT_FS=y
> >   CONFIG_TMPFS=y
> 
> 
-- 
 Eugeniy Paltsev