linux-kernel - Re: [PATCH 1/4] ARM: dts: ux500: Disable I2C/SPI buses by default

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Date:   Tue, 26 Nov 2019 13:17:26 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.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 1/4] ARM: dts: ux500: Disable I2C/SPI buses by default

On Mon, Nov 25, 2019 at 6:05 PM Stephan Gerhold <stephan@...hold.net> wrote:

> At the moment, all 5 I2C and 6 SPI buses are probed and exposed
> to user-space by default - even if they are not muxed to any pins
> on the board. This means that user-space sees an I2C/SPI bus that
> cannot be actually used properly.
>
> In some cases this was used to put the corresponding pins into
> a low power sleep mode - but even then the pins first need to be
> configured by the board-specific device tree part.
>
> Avoid exposing unconfigured devices to user-space by disabling
> the I2C/SPI buses by default. Enable them in the board device trees
> when needed.
>
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>

All 4 patches applied and pushed to ux500-dts for v5.6!

Yours,
Linus Walleij