linux-kernel - [PATCH] ARM: fix DEBUG_UART_PHYS/VIRT issue when modifying DEBUG

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Date:	Tue, 13 Jan 2015 11:37:48 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [PATCH] ARM: fix DEBUG_UART_PHYS/VIRT issue when modifying DEBUG_LL output

The DEBUG_UART_PHYS/VIRT value can only be automatically set once
(automatically means set from the DEBUG_<SOC_ID>_<UART_ID> option), which
prevents re-configuring the earlyprintk output for another platform once
the DEBUG_LL output has been selected.

Add a new boolean option (DEBUG_CUSTOM_UART_ADDR) enabling custom phys and
virt address setting (configured through DEBUG_CUSTOM_UART_PHYS/VIRT
options), and make DEBUG_UART_PHYS/VIRT hidden so that they will always be
set from one of the 'default' definitions, and thus will be overwritten
each time you change the DEBUG_LL output.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
Hello,

I know there is some WIP on DEBUG_LL and multi-platform [1], but from my
understanding (tell me if I'm wrong), it does not address this "select once
keep forever" issue.

Best Regards,

Boris


[1]https://lkml.org/lkml/2015/1/5/275

 arch/arm/Kconfig.debug | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 5ddd490..54ee0f3 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -1227,8 +1227,22 @@ config DEBUG_UART_8250
 config DEBUG_UART_BCM63XX
 	def_bool ARCH_BCM_63XX
 
-config DEBUG_UART_PHYS
+config DEBUG_CUSTOM_UART_ADDR
+	bool "Custom phys and virt address for debug uart"
+
+config DEBUG_CUSTOM_UART_PHYS
 	hex "Physical base address of debug UART"
+	depends on DEBUG_CUSTOM_UART_ADDR
+	default 0x0
+
+config DEBUG_CUSTOM_UART_VIRT
+	hex "Virtual base address of debug UART"
+	depends on DEBUG_CUSTOM_UART_ADDR
+	default 0x0
+
+config DEBUG_UART_PHYS
+	hex
+	default DEBUG_CUSTOM_UART_PHYS if DEBUG_CUSTOM_UART_ADDR
 	default 0x01c20000 if DEBUG_DAVINCI_DMx_UART0
 	default 0x01c28000 if DEBUG_SUNXI_UART0
 	default 0x01c28400 if DEBUG_SUNXI_UART1
@@ -1323,7 +1337,8 @@ config DEBUG_UART_PHYS
 		DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART
 
 config DEBUG_UART_VIRT
-	hex "Virtual base address of debug UART"
+	hex
+	default DEBUG_CUSTOM_UART_VIRT if MMU && DEBUG_CUSTOM_UART_ADDR
 	default 0xe0010fe0 if ARCH_RPC
 	default 0xe1000000 if DEBUG_MSM_UART
 	default 0xf0000be0 if ARCH_EBSA110
-- 
1.9.1

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