linux-kernel - Re: [PATCH 2/3] i2c: rcar: introduce Gen4 devices

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Message-ID: <ZPc4ylzR4MJEMlbx@ninjato>
Date:   Tue, 5 Sep 2023 16:18:50 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Andi Shyti <andi.shyti@...nel.org>
Cc:     linux-renesas-soc@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] i2c: rcar: introduce Gen4 devices

On Tue, Sep 05, 2023 at 01:36:24PM +0200, Andi Shyti wrote:
> Hi Wolfram,
> 
> > @@ -1031,10 +1021,12 @@ static const struct of_device_id rcar_i2c_dt_ids[] = {
> >  	{ .compatible = "renesas,i2c-r8a7794", .data = (void *)I2C_RCAR_GEN2 },
> >  	{ .compatible = "renesas,i2c-r8a7795", .data = (void *)I2C_RCAR_GEN3 },
> >  	{ .compatible = "renesas,i2c-r8a7796", .data = (void *)I2C_RCAR_GEN3 },
> > +	/* S4 has no FM+ bit */
> > +	{ .compatible = "renesas,i2c-r8a779f0", .data = (void *)I2C_RCAR_GEN3 },
> 
> is this I2C_RCAR_GEN3 or I2C_RCAR_GEN4?

Technically, it is Gen4. But its I2C controller behaves like Gen3. This
is why it has a seperate entry to avoid the generic Gen4 fallback...

> > -	{ .compatible = "renesas,rcar-gen4-i2c", .data = (void *)I2C_RCAR_GEN3 },
> > +	{ .compatible = "renesas,rcar-gen4-i2c", .data = (void *)I2C_RCAR_GEN4 },

... here.


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