linux-kernel - [PATCH 1/4] docs: dt: Document new bootargs chosen property

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Date: Sun, 12 May 2024 15:25:08 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Saravana Kannan <saravanak@...gle.com>,
	Arnd Bergmann <arnd@...db.de>,
	Helge Deller <deller@....de>,
	Javier Martinez Canillas <javierm@...hat.com>,
	Baoquan He <bhe@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	David Bauer <mail@...id-bauer.net>,
	Liviu Dudau <liviu@...au.co.uk>,
	Serge Semin <fancer.lancer@...il.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mips@...r.kernel.org
Cc: Christian Marangi <ansuelsmth@...il.com>
Subject: [PATCH 1/4] docs: dt: Document new bootargs chosen property

The bootargs property might be overridden by bootloaders on kernel load,
in such scenario, bootargs-override might be used instead. With
bootargs-override set, any value set in bootargs will be ignored.

The bootargs-append can be used to append additional kernel arguments
to the bootargs property. This can be useful in the context of a
bootargs overridden by the bootloader that contains correct that but
the kernel require additional one to be correctly setup.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 Documentation/devicetree/usage-model.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/usage-model.rst b/Documentation/devicetree/usage-model.rst
index 0717426856b2..885be3e582fc 100644
--- a/Documentation/devicetree/usage-model.rst
+++ b/Documentation/devicetree/usage-model.rst
@@ -217,6 +217,15 @@ On ARM, the function setup_machine_fdt() is responsible for early
 scanning of the device tree after selecting the correct machine_desc
 that supports the board.
 
+The bootargs property might be overridden by bootloaders on kernel load,
+in such scenario, bootargs-override might be used instead. With
+bootargs-override set, any value set in bootargs will be ignored.
+
+The bootargs-append can be used to append additional kernel arguments
+to the bootargs property. This can be useful in the context of a
+bootargs overridden by the bootloader that contains correct that but
+the kernel require additional one to be correctly setup.
+
 2.4 Device population
 ---------------------
 After the board has been identified, and after the early configuration data
-- 
2.43.0