linux-kernel - [PATCH V2] ARM: OMAP3: Fix hardware detection for omap3630 when booted with device tree

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Message-ID: <1381177842-2678-1-git-send-email-nm@ti.com>
Date:	Mon, 7 Oct 2013 15:30:42 -0500
From:	Nishanth Menon <nm@...com>
To:	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>, Felipe <balbi@...com>,
	Olof Johansson <olof@...om.net>
CC:	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, Nishanth Menon <nm@...com>
Subject: [PATCH V2] ARM: OMAP3: Fix hardware detection for omap3630 when booted with device tree

SoC family definitions at the moment are reactive to board needs
as a result, beagle-xm would matchup with ti,omap3 which invokes
omap3430_init_early instead of omap3630_init_early. Obviously, this is
the wrong behavior.

With clock node dts conversion, we get the following warnings as a
result and 3630 based platforms fails to boot (uart4 clocks are only
present in OMAP3630 and not present in OMAP3430):

...
omap_hwmod: uart4: cannot clk_get main_clk uart4_fck
omap_hwmod: uart4: cannot _init_clocks

WARNING: CPU: 0 PID: 1 at arch/arm/mach-omap2/omap_hwmod.c:2434
_init+0x6c/0x80()
omap_hwmod: uart4: couldn't init clocks
...

WARNING: CPU: 0 PID: 1 at arch/arm/mach-omap2/omap_hwmod.c:2126
_enable+0x254/0x280()
omap_hwmod: timer12: enabled state can only be entered from
initialized, idle, or disabled state
...

WARNING: CPU: 0 PID: 46 at arch/arm/mach-omap2/omap_hwmod.c:2224
_idle+0xd4/0xf8()
omap_hwmod: timer12: idle state can only be entered from enabled state

WARNING: CPU: 0 PID: 1 at arch/arm/mach-omap2/omap_hwmod.c:2126
_enable+0x254/0x280()
omap_hwmod: uart4: enabled state can only be entered from
initialized, idle, or disabled state

So, add specific compatiblity for 3630 to allow match for Beagle-XM
platform.

Signed-off-by: Nishanth Menon <nm@...com>
---

Changes in V2 (since v1):
	- based on v3.12-rc4 tag
	- Update based on Tony's review comments.

V1: http://marc.info/?l=linux-omap&m=138117342909375&w=2

RFC: https://patchwork.kernel.org/patch/2919661/

 arch/arm/boot/dts/omap3-beagle-xm.dts |    2 +-
 arch/arm/mach-omap2/board-generic.c   |   19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/omap3-beagle-xm.dts b/arch/arm/boot/dts/omap3-beagle-xm.dts
index 0c514dc..02dd4a9 100644
--- a/arch/arm/boot/dts/omap3-beagle-xm.dts
+++ b/arch/arm/boot/dts/omap3-beagle-xm.dts
@@ -11,7 +11,7 @@
 
 / {
 	model = "TI OMAP3 BeagleBoard xM";
-	compatible = "ti,omap3-beagle-xm", "ti,omap3-beagle", "ti,omap3";
+	compatible = "ti,omap3-beagle-xm", "ti,omap363x", "ti,omap3";
 
 	cpus {
 		cpu@0 {
diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
index 39c7838..4fe5b9c 100644
--- a/arch/arm/mach-omap2/board-generic.c
+++ b/arch/arm/mach-omap2/board-generic.c
@@ -113,6 +113,7 @@ MACHINE_END
 #ifdef CONFIG_ARCH_OMAP3
 static const char *omap3_boards_compat[] __initdata = {
 	"ti,omap3",
+	"ti,omap343x",
 	NULL,
 };
 
@@ -129,6 +130,24 @@ DT_MACHINE_START(OMAP3_DT, "Generic OMAP3 (Flattened Device Tree)")
 	.restart	= omap3xxx_restart,
 MACHINE_END
 
+static const char *omap36xx_boards_compat[] __initdata = {
+	"ti,omap36xx",
+	NULL,
+};
+
+DT_MACHINE_START(OMAP36XX_DT, "Generic OMAP363x (Flattened Device Tree)")
+	.reserve	= omap_reserve,
+	.map_io		= omap3_map_io,
+	.init_early	= omap3630_init_early,
+	.init_irq	= omap_intc_of_init,
+	.handle_irq	= omap3_intc_handle_irq,
+	.init_machine	= omap_generic_init,
+	.init_late	= omap3_init_late,
+	.init_time	= omap3_sync32k_timer_init,
+	.dt_compat	= omap36xx_boards_compat,
+	.restart	= omap3xxx_restart,
+MACHINE_END
+
 static const char *omap3_gp_boards_compat[] __initdata = {
 	"ti,omap3-beagle",
 	"timll,omap3-devkit8000",
-- 
1.7.9.5

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