linux-kernel - Re: [PATCH] ARM: bcm2835: add device tree for Raspberry Pi model B+

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Date:	Tue, 28 Oct 2014 19:33:59 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Matthias Klein <matthias.klein@...ux.com>,
	linux-rpi-kernel@...ts.infradead.org
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: bcm2835: add device tree for Raspberry Pi model
 B+

On 10/27/2014 06:52 PM, Matthias Klein wrote:
> The model B and B+ differ in the GPIO lines for ACT and PWR led.
> The PWR led on the B+ model is active low.

This new file is almost identical to bcm2835-rpi.dts. Perhaps we can use
some include files to share the common portions so they aren't
duplicated. Roughly:

* Move all the common content from bcm2835-rpi.dts into bcm2835-rpi.dtsi.

* Update bcm2835-rpi.dts to include bcm2835-rpi.dtsi to get all the
common parts, and add the few lines of differences.

* Update this patch similarly.

Does that make sense?

A couple changes to this patch and the existing bcm2835-rpi.dts might
reduce the differences even further, leading to more common code in
bcm2835-rpi.dtsi:

- Add the PWR LED to bcm2835-rpi-b.dts, if appropriate.
- Add the I2S pinmux settings for B+ too.

> diff --git a/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts b/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts
...
> +&mmc {

That label doesn't exist; it should be &sdhci. Consequently:

> Error: arch/arm/boot/dts/bcm2835-rpi-b-plus.dts:64.2-3 label or path, 'mmc', not found
> FATAL ERROR: Syntax error parsing input tree
> make[1]: *** [arch/arm/boot/dts/bcm2835-rpi-b-plus.dtb] Error 1

This new DT file should be added to arch/arm/boot/dts/Makefile too.
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