netdev - Re: [PATCH net-next v3] ravb: Avoid unsupported internal delay mode for R-Car E3/D3

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Message-ID: <8f6ce269-5d2b-240d-3136-91a585a66631@cogentembedded.com>
Date:   Tue, 23 Apr 2019 18:18:35 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Simon Horman <horms+renesas@...ge.net.au>,
        David Miller <davem@...emloft.net>
Cc:     Magnus Damm <magnus.damm@...il.com>, netdev@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next v3] ravb: Avoid unsupported internal delay mode
 for R-Car E3/D3

On 04/23/2019 04:01 PM, Simon Horman wrote:

> According to the R-Car Gen3 Hardware Manual Rev 1.50 of Nov 30, 2018, the
> TX clock internal delay mode isn't supported on R-Car E3 (r8a77990) or D3
> (r8a77995). And by extension it is also not supported by RZ/G2E (r9a774c0).
> 
> This matches all ES versions of the affected SoCs as it is
> not clear if this problem will be resolved in newer chips.
> This can be revisited, as necessary.
> 
> This patch does not error-out if PHY_INTERFACE_MODE_RGMII_ID or
> PHY_INTERFACE_MODE_RGMII_TXID are used on SoCs where TX clock delay
> mode is not supported as there is a risk of introducing a regression
> when used in conjunction with older DT blobs present in the field.
> Rather, a warning is logged in such cases.
> 
> Based on work by Kazuya Mizuguchi.
> 
> Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>

Reviewed-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

[...]

MBR, Seregi