linux-kernel - Re: [PATCH net-next 2/2] drivers: net: dsa: mt7530: MT7530 optional GPIO support

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Date:   Tue, 19 Jan 2021 11:20:48 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        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>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <linux@...linux.org.uk>,
        netdev <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        René van Dorst <opensource@...rst.com>,
        Frank Wunderlich <frank-w@...lic-files.de>
Subject: Re: [PATCH net-next 2/2] drivers: net: dsa: mt7530: MT7530 optional
 GPIO support

Hi Linus,

On Mon, Jan 18, 2021 at 10:55 PM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> So for offset 0..14 this becomes bits
> 0, 1, 2, 4, 5, 6, 8, 9, 10, 12  ... 18
>
> What is the logic in this and is it what you intend?

Yes. Bit 0..2 are phy 0's LED 0..2, bit 4..6 are phy 1's LED 0..2, etc.

> Please add a comment explaining what the offset is supposed
> to become for offsets 0..14 and why.

I already added to mt7530.h, perhaps I should copy it here?

>
> > +       gc->ngpio = 15;
>
> And it really IS 15 not 16? Not that I know network equipment
> very well...

Yes, 3 LEDs for each phy.

>
> Yours,
> Linus Walleij