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

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Date:   Mon, 8 Apr 2019 11:48:26 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Magnus Damm <magnus.damm@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH/RFC net-next] ravb: Avoid unsupported internal delay mode
 for R-Car E3/D3

On Mon, Apr 08, 2019 at 11:01:04AM +0200, Wolfram Sang wrote:
> On Mon, Apr 08, 2019 at 10:29:28AM +0200, Simon Horman wrote:
> > According to the R-Car Gen3 Hardware Manual Errata for Rev 1.00 of
> > August 24, 2018, the TX clock internal delay mode isn't supported
> > on R-Car E3 (r8a77990) and D3 (r8a77995).
> 
> Yes, it made it also into the revised documentation v1.50, see chapter
> 50.2.7., bit 14.
> 
> > +static const struct soc_device_attribute ravb_delay_mode_quirk_match[] = {
> > +	{ .soc_id = "r8a77990", .revision = "ES1.*" },
> > +	{ .soc_id = "r8a77995", .revision = "ES1.*" },
> > +	{ /* sentinel */ }
> > +};
> 
> I might have missed it but is there a plan to fix this in later
> revisions of D3/E3? I was under the impression that it is not and then
> we could base it on compatible rather than soc_device_match?

I am not aware of any such plan (or the absence of such a plan).

I was unsure weather to go with the compat approach of the quirk approach.
In the end I went with the quirk approach as it seems simpler. But
I'm happy to re-arrange things.