netdev - Re: [PATCH v2 net-next] ravb: Avoid unsupported internal delay mode for R-Car E3/D3

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Message-ID: <20190410161906.GD8916@lunn.ch>
Date:   Wed, 10 Apr 2019 18:19:06 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Simon Horman <horms+renesas@...ge.net.au>
Cc:     David Miller <davem@...emloft.net>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Magnus Damm <magnus.damm@...il.com>, netdev@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: Re: [PATCH v2 net-next] ravb: Avoid unsupported internal delay mode
 for R-Car E3/D3

On Wed, Apr 10, 2019 at 01:45:02PM +0200, 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.

Hi Simon

I think it should at least WARN_ON(). Such blobs are broken, even if
they do kind of work.

     Andrew