linux-kernel - Re: [PATCH v2] ARC: axs10x - add Ethernet PHY description in .dts

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Date:	Wed, 6 Apr 2016 14:42:13 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	<linux-snps-arc@...ts.infradead.org>
CC:	Rob Herring <robh@...nel.org>, Phil Reid <preid@...ctromag.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	Gabriel Fernandez <gabriel.fernandez@...aro.org>,
	Giuseppe CAVALLARO <peppe.cavallaro@...com>,
	Phil Reid <preid@...ctromag.com.au>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH v2] ARC: axs10x - add Ethernet PHY description in .dts

Hi,

On Thursday 17 March 2016 03:11 PM, Alexey Brodkin wrote:
> Following commit broke DW GMAC functionality on AXS10x boards:
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e34d65696d2ef13dc32f2a162556c86c461ed763
> 
> That's what happens on eth0 up:
> --------------------------->8------------------------
> libphy: PHY stmmac-0:ffffffff not found
> eth0: Could not attach to PHY
> stmmac_open: Cannot attach to PHY (error: -19)
> --------------------------->8------------------------
> 
> Simplest solution is to add PHY description in board's .dts.
> And so we do here.
> 
> Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Phil Reid <preid@...ctromag.com.au>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: linux-kernel@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Cc: stable@...r.kernel.org # 4.5.x
> Cc: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
> ---
> 
> Changes v1 -> v2:
>  * PHY node name changed to match real PHY number being used (Sergei)
> 
>  arch/arc/boot/dts/axs10x_mb.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arc/boot/dts/axs10x_mb.dtsi b/arch/arc/boot/dts/axs10x_mb.dtsi
> index 44a578c..ab5d570 100644
> --- a/arch/arc/boot/dts/axs10x_mb.dtsi
> +++ b/arch/arc/boot/dts/axs10x_mb.dtsi
> @@ -47,6 +47,14 @@
>  			clocks = <&apbclk>;
>  			clock-names = "stmmaceth";
>  			max-speed = <100>;
> +			mdio0 {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				compatible = "snps,dwmac-mdio";
> +				phy1: ethernet-phy@1 {
> +					reg = <1>;
> +				};
> +			};
>  		};
>  
>  		ehci@...0000 {


So above DT fix for ARC went into 4.6-rc1 and ethernet was still broken on axs103
board.

---------->8-------------
libphy: PHY stmmac-0:ffffffff not found
eth0: Could not attach to PHY
stmmac_open: Cannot attach to PHY (error: -19)
---------->8-------------

On 4.6-rc2 if I revert the DT change, ethernet works again.

@Giuseppe, @Phil, @Gabriel, I see you have made changes in that area. I presume
that above revert is the right/sufficient thing or do we need to do something else
as well.

TIA,
-Vineet