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Date:   Fri, 14 Feb 2020 10:34:46 +0800
From:   Shawn Guo <>
To:     Vladimir Oltean <>
Subject: Re: [PATCH] ARM: dts: ls1021a: Restore MDIO compatible to gianfar

On Sun, Jan 26, 2020 at 09:49:50PM +0200, Vladimir Oltean wrote:
> The difference between "fsl,etsec2-mdio" and "gianfar" has to do with
> the .get_tbipa function, which calculates the address of the TBIPA
> register automatically, if not explicitly specified. [ see
> drivers/net/ethernet/freescale/fsl_pq_mdio.c ]. On LS1021A, the TBIPA
> register is at offset 0x30 within the port register block, which is what
> the "gianfar" method of calculating addresses actually does.
> Luckily, the bad "compatible" is inconsequential for ls1021a.dtsi,
> because the TBIPA register is explicitly specified via the second "reg"
> (<0x0 0x2d10030 0x0 0x4>), so the "get_tbipa" function is dead code.
> Nonetheless it's good to restore it to its correct value.
> Background discussion:
> Fixes: c7861adbe37f ("ARM: dts: ls1021: Fix SGMII PCS link remaining down after PHY disconnect")
> Reported-by: Pavel Machek <>
> Signed-off-by: Vladimir Oltean <>

Applied, thanks.

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