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Commit 1b34fe7a authored by Patrick Daly's avatar Patrick Daly
Browse files

ARM: qcom: Add CONFIG_ARCH_MSM8953_BOOT_ORDERING 



Populate the devicetree at late init, after all platform device drivers
are registered. Devices are probed in the order they are listed in
devicetree, allowing greater flexibility for optimization.

Change-Id: I2b49bba49d8a36d26a6f53d517125af0cdc5656a
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent 37023fd5

arch/arm/mach-qcom/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -65,6 +65,17 @@ config ARCH_MSM8953 
	select HAVE_CLK_PREPARE

	select COMMON_CLK_MSM



config ARCH_MSM8953_BOOT_ORDERING

	bool "Enable support for MSM8953 device boot ordering"

	default n

	help

	  Populate devices from devicetree at late_init, after

	  drivers for all platform devices have been registered.

	  This causes devices to be probed in the order they are

	  listed in devicetree. Thus it is possible to have

	  greater control over the probe ordering such that

	  overall boot time can be reduced.



config ARCH_MSM8937

	bool "Enable support for MSM8937"

	select CPU_V7

arch/arm/mach-qcom/board-msm8953.c

+17 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include "board-dt.h"

#include <asm/mach/map.h>

#include <asm/mach/arch.h>

#include <linux/of_platform.h>



static const char *msm8953_dt_match[] __initconst = {

	"qcom,msm8953",
@@ -23,9 +24,25 @@ static const char *msm8953_dt_match[] __initconst = { 


static void __init msm8953_init(void)

{

	if (IS_ENABLED(CONFIG_ARCH_MSM8953_BOOT_ORDERING))

		return;

	board_dt_populate(NULL);

}



#ifdef CONFIG_ARCH_MSM8953_BOOT_ORDERING

static int __init msm8953_dt_populate(void)

{

	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);



	/* Explicitly parent the /soc devices to the root node to preserve

	 * the kernel ABI (sysfs structure, etc) until userspace is updated

	 */

	of_platform_populate(of_find_node_by_path("/soc"),

			     of_default_bus_match_table, NULL, NULL);

}

late_initcall(msm8953_dt_populate);

#endif



DT_MACHINE_START(MSM8953_DT,

	"Qualcomm Technologies, Inc. MSM8953 (Flattened Device Tree)")

	.init_machine		= msm8953_init,

drivers/of/platform.c

+1 −1
Original line number Diff line number Diff line
@@ -502,7 +502,7 @@ int of_platform_default_populate(struct device_node *root, 
}

EXPORT_SYMBOL_GPL(of_platform_default_populate);



#ifndef CONFIG_PPC

#if !defined(CONFIG_PPC) && !defined(CONFIG_ARCH_MSM8953_BOOT_ORDERING)

static int __init of_platform_default_populate_init(void)

{

	struct device_node *node;