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From: slash.tmp@free.fr (Mason)
To: linux-arm-kernel@lists.infradead.org
Subject: Conditionals in dtsi files
Date: Fri, 13 Nov 2015 10:33:50 +0100	[thread overview]
Message-ID: <5645AE7E.4090003@free.fr> (raw)

Hello,

I'm wondering how much C preprocessor syntax one can use in DT files.

Suppose I have 2 board DTS (both including common.dtsi)

board_A.dts (1-core), board_B.dts (2-core)

Can I have in common.dtsi something along these lines:

	cpus {
		enable-method = "foo,bar";
		#address-cells = <1>;
		#size-cells = <0>;

		cpu0: cpu at 0 {
			compatible = "arm,cortex-a9";
			device_type = "cpu";
			reg = <0>;
		};

#if CORE_COUNT > 1
		cpu1: cpu at 1 {
			compatible = "arm,cortex-a9";
			device_type = "cpu";
			reg = <1>;
		};
#endif
	};


board_A.dts would have
#define CORE_COUNT 1
#include "common.dtsi"

board_B.dts would have
#define CORE_COUNT 2
#include "common.dtsi"

Regards.

WARNING: multiple messages have this Message-ID (diff)
From: Mason <slash.tmp-GANU6spQydw@public.gmane.org>
To: Linux ARM
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	DT <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Cc: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Grant Likely
	<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Subject: Conditionals in dtsi files
Date: Fri, 13 Nov 2015 10:33:50 +0100	[thread overview]
Message-ID: <5645AE7E.4090003@free.fr> (raw)

Hello,

I'm wondering how much C preprocessor syntax one can use in DT files.

Suppose I have 2 board DTS (both including common.dtsi)

board_A.dts (1-core), board_B.dts (2-core)

Can I have in common.dtsi something along these lines:

	cpus {
		enable-method = "foo,bar";
		#address-cells = <1>;
		#size-cells = <0>;

		cpu0: cpu@0 {
			compatible = "arm,cortex-a9";
			device_type = "cpu";
			reg = <0>;
		};

#if CORE_COUNT > 1
		cpu1: cpu@1 {
			compatible = "arm,cortex-a9";
			device_type = "cpu";
			reg = <1>;
		};
#endif
	};


board_A.dts would have
#define CORE_COUNT 1
#include "common.dtsi"

board_B.dts would have
#define CORE_COUNT 2
#include "common.dtsi"

Regards.
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             reply	other threads:[~2015-11-13  9:33 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-13  9:33 Mason [this message]
2015-11-13  9:33 ` Conditionals in dtsi files Mason
2015-11-13  9:43 ` Arnd Bergmann
2015-11-13  9:43   ` Arnd Bergmann
2015-11-13 11:15   ` Mark Rutland
2015-11-13 11:15     ` Mark Rutland

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