linux-kernel - Re: [PATCH 3/6] net: arc_emac: support the phy reset for emac driver

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Date:	Fri, 11 Mar 2016 22:22:00 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Caesar Wang <wxt@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
	"David S. Miller" <davem@...emloft.net>,
	Rob Herring <robh+dt@...nel.org>
Cc:	linux-rockchip@...ts.infradead.org, keescook@...gle.com,
	leozwang@...gle.com, Alexander Kochetkov <al.kochet@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] net: arc_emac: support the phy reset for emac driver

On 03/11/2016 01:55 PM, Caesar Wang wrote:

> This patch adds to support the emac phy reset.
>
> 1) phy-reset-gpios:
> The phy-reset-gpios is an optional property for arc emac device tree boot.
> Change the binding document to match the driver code.
>
> 2) phy-reset-duration:
> Different boards may require different phy reset duration. Add property
> phy-reset-duration for device tree probe, so that the boards that need
> a longer reset duration can specify it in their device tree.
>
> 3) phy-reset-active-high:
> We need that for a custom hardware that needs the reverse reset sequence.

    What concerns me the most about the existing (and suggested) PHY reset 
related props is that they are located in the MAC device node while not having 
*anything* to do with the MAC at all! These props actually belong to the PHY 
nodes, and I'm currently looking into how to handle them there, where they 
belong...

> Of course, this patch will fix the issue on
> https://patchwork.kernel.org/patch/8186801/.
>
> In some cases, the emac couldn't work if you don't have reset the phy.
> Let's add it to happy work.
>
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>

[...]

MBR, Sergei