linux-kernel - Re: [PATCH net] net: dsa: microchip: fix probe of I2C-connected KSZ8563

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Date:   Fri, 20 Jan 2023 10:47:35 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <olteanv@...il.com>, <UNGLinuxDriver@...rochip.com>,
        <andrew@...n.ch>, <f.fainelli@...il.com>, <kuba@...nel.org>,
        <a.fatoum@...gutronix.de>, <Woojung.Huh@...rochip.com>,
        <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...gutronix.de>, <pabeni@...hat.com>, <ore@...gutronix.de>,
        <edumazet@...gle.com>
Subject: Re: [PATCH net] net: dsa: microchip: fix probe of I2C-connected
 KSZ8563

On Fri, 2023-01-20 at 11:42 +0100, Ahmad Fatoum wrote:
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> On 20.01.23 11:38, Arun.Ramadoss@...rochip.com wrote:
> > On Fri, 2023-01-20 at 08:57 +0100, Ahmad Fatoum wrote:
> > > > In this commit, there is no KSZ8563 member in struct
> > > > ksz_switch_chips.
> > > > Whether the fixes should be to this commit "net: dsa:
> > > > microchip:
> > > > add
> > > > separate struct ksz_chip_data for KSZ8563" where the member is
> > > > introduced.
> > > 
> > > I disagree. eee16b147121 introduced the check that made my device
> > > not probe anymore, so that's what's referenced in Fixes:. Commit
> > > b44908095612 should have had a Fixes: pointing at eee16b147121
> > > as well, so users don't miss it. But if they miss it, they
> > > will notice this at build-time anyway.
> > 
> > The KSZ9893, KSZ9563 and KSZ8563 all has the same chip id
> > 0x00989300.
> > They belong to 3 port switch family. Differentiation is done based
> > on
> > 0x1F register. In the commit eee16b147121, there is no
> > differentiation
> > based on 0x1F, device is selected based on chip id, all the three
> > chips
> > will be identified as ksz9893 only. After the commit b44908095612,
> > KSZ8563 chips is identified based on 0x1F register.
> 
> Thanks for the elaboration. I see it now. I will send a v2
> with revised commit messages and Fixes:. Should I include
> your Reviewed-by: with the commit message rewritten?

I think, I can add my Ack-by: after you post v2 version.

> 
> Cheers,
> Ahmad
> 
> > 
> > > 
> > > Cheers,
> > > Ahmad
> > > 
> > > > 
> > > > > chip
> > > > > Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> > > > > ---
> > > > >  drivers/net/dsa/microchip/ksz9477_i2c.c | 2 +-
> > > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > > 
> > > > > diff --git a/drivers/net/dsa/microchip/ksz9477_i2c.c
> > > > > b/drivers/net/dsa/microchip/ksz9477_i2c.c
> > > > > index c1a633ca1e6d..e315f669ec06 100644
> > > > > --- a/drivers/net/dsa/microchip/ksz9477_i2c.c
> > > > > +++ b/drivers/net/dsa/microchip/ksz9477_i2c.c
> > > > > @@ -104,7 +104,7 @@ static const struct of_device_id
> > > > > ksz9477_dt_ids[]
> > > > > = {
> > > > >         },
> > > > >         {
> > > > >                 .compatible = "microchip,ksz8563",
> > > > > -               .data = &ksz_switch_chips[KSZ9893]
> > > > > +               .data = &ksz_switch_chips[KSZ8563]
> > > > >         },
> > > > >         {
> > > > >                 .compatible = "microchip,ksz9567",
> > > > > --
> > > > > 2.30.2
> > > > > 
> > > 
> > > --
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