linux-kernel - Re: [PATCH net-next,v2] net: dsa: mt7530: clean up core and TRGMII clock setup

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Date:   Sat, 27 Mar 2021 15:45:44 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next,v2] net: dsa: mt7530: clean up core and TRGMII
 clock setup

On Fri, Mar 26, 2021 at 11:07:52PM -0700, Ilya Lipnitskiy wrote:
> Three minor changes:
> 
> - When disabling PLL, there is no need to call core_write_mmd_indirect
>   directly, use the core_write wrapper instead like the rest of the code
>   in the function does. This change helps with consistency and
>   readability. Move the comment to the definition of
>   core_read_mmd_indirect where it belongs.
> 
> - Disable both core and TRGMII Tx clocks prior to reconfiguring.
>   Previously, only the core clock was disabled, but not TRGMII Tx clock.
>   So disable both, then configure them, then re-enable both, for
>   consistency.
> 
> - The core clock enable bit (REG_GSWCK_EN) is written redundantly three
>   times. Simplify the code and only write the register only once at the
>   end of clock reconfiguration to enable both core and TRGMII Tx clocks.
> 
> Tested on Ubiquiti ER-X running the GMAC0 and MT7530 in TRGMII mode.
> 
> Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>

Thanks for moving the comment.

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew