linux-kernel - Re: [PATCH 2/5] phy: core: add PHY_MODE

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Message-ID: <20181108004200.GW30658@n2100.armlinux.org.uk>
Date:   Thu, 8 Nov 2018 00:42:00 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Quentin Schulz <quentin.schulz@...tlin.com>,
        Manu Gautam <mgautam@...eaurora.org>,
        Tony Lindgren <tony@...mide.com>, netdev@...r.kernel.org,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Sekhar Nori <nsekhar@...com>, linux-kernel@...r.kernel.org,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        linux-mediatek@...ts.infradead.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Carlo Caione <carlo@...one.org>,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH 2/5] phy: core: add PHY_MODE_ETHERNET

On Wed, Nov 07, 2018 at 06:36:14PM -0600, Grygorii Strashko wrote:
> Add new PHY's mode to be used by Ethernet PHY interface drivers or
> multipurpose PHYs like serdes. It will be reused in further changes.
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>  include/linux/phy/phy.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index b17e770..02c9ef0 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -42,6 +42,7 @@ enum phy_mode {
>  	PHY_MODE_UFS_HS_A,
>  	PHY_MODE_UFS_HS_B,
>  	PHY_MODE_PCIE,
> +	PHY_MODE_ETHERNET,

Are you sure about this - we already have a bunch of "ethernet" modes
that are more specific, like PHY_MODE_SGMII, PHY_MODE_2500SGMII and
PHY_MODE_10GKR which require PHYs to be configured differently.  Having
a very generic "ethernet" mode brings up questions about when it should
be used vs the more specific modes.

(I've already mentioned that the SGMII modes are mis-named, since
they also apply to 1000base-X and 2500base-X - the only difference
is how one 16-bit word in the data stream is used which has no effect
on the PHY.)

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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