linux-kernel - Re: [PATCH net-next v2 1/1] net: stmmac: use GPIO descriptors in stmmac_mdio

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Message-ID: <CACRpkdbQ5VivFJhL4keOgmUe7BzhVU2v2R0Lso8rQx5s3tHY8w@mail.gmail.com>
Date:   Sat, 15 Jun 2019 11:34:25 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Giuseppe CAVALLARO <peppe.cavallaro@...com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>
Subject: Re: [PATCH net-next v2 1/1] net: stmmac: use GPIO descriptors in stmmac_mdio_reset

On Sat, Jun 15, 2019 at 11:11 AM Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:

> I think I finally understand why you want to switch everything over to
> GPIO descriptors

A bit after-the-fact reasoning, but after I was made aware of an interesting
lecture by John Ousterhout I feel the best description of the descriptor
refactoring is the idea to make the GPIO API narrow and deep, make
it simple for consumers (hence <linux/gpio/consumer.h>) and handle
as much special cases (polarity inversion, open drain...) as possible
behind the scenes.

Yours,
Linus Walleij