linux-kernel - [PATCH 3/4] of: add support for bootargs-append chosen property

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Date: Sun, 12 May 2024 15:25:10 +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 3/4] of: add support for bootargs-append chosen property

Add support for bootargs-append chosen property.

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>
---
 drivers/of/fdt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 253315421591..cc99958872e4 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1080,6 +1080,9 @@ int __init early_init_dt_scan_chosen(char *cmdline)
 		p = of_get_flat_dt_prop(node, "bootargs", &l);
 	if (p != NULL && l > 0)
 		strscpy(cmdline, p, min(l, COMMAND_LINE_SIZE));
+	p = of_get_flat_dt_prop(node, "bootargs-append", &l);
+	if (p != NULL && l > 0)
+		strlcat(cmdline, p, min_t(int, strlen(cmdline) + l, COMMAND_LINE_SIZE));
 
 handle_cmdline:
 	/*
-- 
2.43.0