linux-kernel - [PATCH 5/5] ARM: ux500: Do not supply DMA platform data when booting u8540 platform

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Date:	Fri, 22 Mar 2013 15:27:45 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	arnd@...db.de, linus.walleij@...ricsson.com,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 5/5] ARM: ux500: Do not supply DMA platform data when booting u8540 platform

The u8540 platform DMA settings are not currently supported. In this
patch we ensure they are not passed to the serial driver during boot.
This allows us to reach a terminal when booting with Device Tree
enabled.

Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 arch/arm/mach-ux500/cpu-db8500.c |   26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index 19235cf..da425f7 100644
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -257,9 +257,6 @@ static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
 	/* Requires call-back bindings. */
 	OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata),
 	/* Requires DMA bindings. */
-	OF_DEV_AUXDATA("arm,pl011", 0x80120000, "uart0", &uart0_plat),
-	OF_DEV_AUXDATA("arm,pl011", 0x80121000, "uart1", &uart1_plat),
-	OF_DEV_AUXDATA("arm,pl011", 0x80007000, "uart2", &uart2_plat),
 	OF_DEV_AUXDATA("arm,pl022", 0x80002000, "ssp0",  &ssp0_plat),
 	OF_DEV_AUXDATA("arm,pl18x", 0x80126000, "sdi0",  &mop500_sdi0_data),
 	OF_DEV_AUXDATA("arm,pl18x", 0x80118000, "sdi1",  &mop500_sdi1_data),
@@ -297,6 +294,22 @@ static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
 	{},
 };
 
+static struct of_dev_auxdata u8500_auxdata_uart_lookup[] __initdata = {
+	/* Requires DMA bindings. */
+	OF_DEV_AUXDATA("arm,pl011", 0x80120000, "uart0", &uart0_plat),
+	OF_DEV_AUXDATA("arm,pl011", 0x80121000, "uart1", &uart1_plat),
+	OF_DEV_AUXDATA("arm,pl011", 0x80007000, "uart2", &uart2_plat),
+	{},
+};
+
+static struct of_dev_auxdata u8540_auxdata_uart_lookup[] __initdata = {
+	/* Requires DMA bindings. */
+	OF_DEV_AUXDATA("arm,pl011", 0x80120000, "uart0", NULL),
+	OF_DEV_AUXDATA("arm,pl011", 0x80121000, "uart1", NULL),
+	OF_DEV_AUXDATA("arm,pl011", 0x80007000, "uart2", NULL),
+	{},
+};
+
 static const struct of_device_id u8500_local_bus_nodes[] = {
 	/* only create devices below soc node */
 	{ .compatible = "stericsson,db8500", },
@@ -324,6 +337,13 @@ static void __init u8500_init_machine(void)
 
 	/* automatically probe child nodes of db8500 device */
 	of_platform_populate(NULL, u8500_local_bus_nodes, u8500_auxdata_lookup, parent);
+
+	if (of_machine_is_compatible("st-ericsson,u8540"))
+		of_platform_populate(NULL, u8500_local_bus_nodes,
+				     u8540_auxdata_uart_lookup, parent);
+	else
+		of_platform_populate(NULL, u8500_local_bus_nodes,
+				     u8500_auxdata_uart_lookup, parent);
 }
 
 static const char * stericsson_dt_platform_compat[] = {
-- 
1.7.10.4

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