linux-kernel - Re: [PATCH] gpio: 74x164: add lines-initial-states property

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Date:   Mon, 20 Aug 2018 01:55:03 +0200
From:   David Bauer <mail@...id-bauer.net>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: 74x164: add lines-initial-states property

Hi Linus,

On 8/16/18 10:11 AM, Linus Walleij wrote:
> This sounds like something that should be generic, and not use
> a bitmask, but offsets. It should work even if the number of
> GPIOs from the chip is > 32.
> 
> Is the usecase different from hogs?
> See Documentation/devicetree/bindings/gpio.txt

Thanks for pointing that out. Indeed for my use-case (Asserting single
output to be high on driver probe) hogs are are sufficient solution.

Best wishes
David