From: slash.tmp@free.fr (Mason)
To: linux-arm-kernel@lists.infradead.org
Subject: Preprocessor arithmetic in dtsi files (base + offset)
Date: Thu, 26 Nov 2015 14:16:16 +0100 [thread overview]
Message-ID: <56570620.3070106@free.fr> (raw)
Hello,
In the device tree for my ARM platform, I have several nodes with
addresses within the SCU block:
scu: scu at 20000000 {
compatible = "arm,cortex-a9-scu";
reg = <0x20000000 0x100>;
gic: interrupt-controller at 20001000 {
compatible = "arm,cortex-a9-gic";
reg = <0x20001000 0x1000>, <0x20000100 0x0100>;
twd-timer at 20000600 {
compatible = "arm,cortex-a9-twd-timer";
reg = <0x20000600 0x10>;
Can I use preprocessor arithmetic to abstract the base address,
as would be done in C?
#define SCU_BASE 0x20000000
scu: scu at XXX {
compatible = "arm,cortex-a9-scu";
reg = <SCU_BASE 0x100>;
gic: interrupt-controller at XXX {
compatible = "arm,cortex-a9-gic";
reg = <SCU_BASE+0x1000 0x1000>, <SCU_BASE+0x100 0x0100>;
twd-timer at XXX {
compatible = "arm,cortex-a9-twd-timer";
reg = <SCU_BASE+0x600 0x10>;
Are the @XXX important? Can they be removed altogether?
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: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
Sebastian Frias
<sebastian_frias-y1yR0Z3OICC7zZZRDBGcUA@public.gmane.org>
Subject: Preprocessor arithmetic in dtsi files (base + offset)
Date: Thu, 26 Nov 2015 14:16:16 +0100 [thread overview]
Message-ID: <56570620.3070106@free.fr> (raw)
Hello,
In the device tree for my ARM platform, I have several nodes with
addresses within the SCU block:
scu: scu@20000000 {
compatible = "arm,cortex-a9-scu";
reg = <0x20000000 0x100>;
gic: interrupt-controller@20001000 {
compatible = "arm,cortex-a9-gic";
reg = <0x20001000 0x1000>, <0x20000100 0x0100>;
twd-timer@20000600 {
compatible = "arm,cortex-a9-twd-timer";
reg = <0x20000600 0x10>;
Can I use preprocessor arithmetic to abstract the base address,
as would be done in C?
#define SCU_BASE 0x20000000
scu: scu@XXX {
compatible = "arm,cortex-a9-scu";
reg = <SCU_BASE 0x100>;
gic: interrupt-controller@XXX {
compatible = "arm,cortex-a9-gic";
reg = <SCU_BASE+0x1000 0x1000>, <SCU_BASE+0x100 0x0100>;
twd-timer@XXX {
compatible = "arm,cortex-a9-twd-timer";
reg = <SCU_BASE+0x600 0x10>;
Are the @XXX important? Can they be removed altogether?
Regards.
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next reply other threads:[~2015-11-26 13:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-26 13:16 Mason [this message]
2015-11-26 13:16 ` Preprocessor arithmetic in dtsi files (base + offset) Mason
2015-11-26 13:52 ` Mark Rutland
2015-11-26 13:52 ` Mark Rutland
2015-11-26 13:59 ` Russell King - ARM Linux
2015-11-26 13:59 ` Russell King - ARM Linux
2015-11-26 14:44 ` Mason
2015-11-26 14:44 ` Mason
2015-11-26 16:23 ` Geert Uytterhoeven
2015-11-26 16:23 ` Geert Uytterhoeven
2015-11-26 17:51 ` Robin Murphy
2015-11-26 17:51 ` Robin Murphy
2015-12-02 22:14 ` Mason
2015-12-02 22:14 ` Mason
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