Hi , Eduardo.
On 05/25/2012 12:25 PM, Eduardo Valentin wrote:
> This is a way to add an early device for system control module.
> the code is also requesting for driver registration and probing.
> Done at early_initcall because at that time, ioremapping is possible.
>
> Signed-off-by: Eduardo Valentin <eduardo.valentin@xxxxxx>
> ---
> arch/arm/mach-omap2/devices.c | 29 +++++++++++++++++++++++++++++
> 1 files changed, 29 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/devices.c b/arch/arm/mach-omap2/devices.c
> index 9332673..58cc5c3 100644
> --- a/arch/arm/mach-omap2/devices.c
> +++ b/arch/arm/mach-omap2/devices.c
> @@ -40,6 +40,35 @@
> #define L3_MODULES_MAX_LEN 12
> #define L3_MODULES 3
>
> +static struct resource control_resources[] = {
> + [0] = {
> + .start = 0x4a002000,
> + .end = 0x4a0027ff,
> + .flags = IORESOURCE_MEM,
> + },
> +};
> +static struct platform_device control_device = {
> + .name = "omap-control-core",
> + .id = 0,
> + .resource = control_resources,
> + .num_resources = ARRAY_SIZE(control_resources),
> +};
> +
> +static struct platform_device *early_devices[] __initdata = {
> + &control_device,
> +};
> +
> +static int __init plat_early_device_setup(void)
> +{
> + early_platform_add_devices(early_devices,
> + ARRAY_SIZE(early_devices));
> + early_platform_driver_register_all("early_omap_control");
> + early_platform_driver_probe("early_omap_control", 1, false);
I checked out git://gitorious.org/omap-thermal/omap-thermal.git omap_scm_dev.
Looks like that calling devm_kzalloc() and platform_get_resource() from early_initcall is too early.
I get following backtrace (probably the backtrace is kernel config dependent):
...
[ 0.198455] [<c00193b4>] (unwind_backtrace+0x0/0xe0) from [<c02b2a10>] (do_raw_spin_lock+0x20/0x134)
[ 0.207977] [<c02b2a10>] (do_raw_spin_lock+0x20/0x134) from [<c05df068>] (_raw_spin_lock_irqsave+0x58/0x64)
[ 0.218109] [<c05df068>] (_raw_spin_lock_irqsave+0x58/0x64) from [<c02f03bc>] (devres_add+0x18/0x38)
[ 0.227600] [<c02f03bc>] (devres_add+0x18/0x38) from [<c02f07d0>] (devm_kzalloc+0x50/0x5c)
[ 0.236206] [<c02f07d0>] (devm_kzalloc+0x50/0x5c) from [<c05c73a4>] (omap_control_probe+0x20/0xe4)
[ 0.245544] [<c05c73a4>] (omap_control_probe+0x20/0xe4) from [<c07b3178>] (early_platform_driver_probe+0x1ac/0x23c)
[ 0.256378] [<c07b3178>] (early_platform_driver_probe+0x1ac/0x23c) from [<c0798030>] (plat_early_device_setup+0x2c/0x3c)
[ 0.267700] [<c0798030>] (plat_early_device_setup+0x2c/0x3c) from [<c078f8c4>] (do_one_initcall+0x90/0x164)
[ 0.277801] [<c078f8c4>] (do_one_initcall+0x90/0x164) from [<c078f9ec>] (kernel_init+0x54/0x1a4)
[ 0.286956] [<c078f9ec>] (kernel_init+0x54/0x1a4) from [<c0013818>] (kernel_thread_exit+0x0/0x8)
[ 0.296203] ------------[ cut here ]------------
[ 0.301086] WARNING: at include/linux/kref.h:41 kobject_get+0x24/0x48()
[ 0.308044] [<c00193b4>] (unwind_backtrace+0x0/0xe0) from [<c00394a4>] (warn_slowpath_common+0x48/0x60)
[ 0.317871] [<c00394a4>] (warn_slowpath_common+0x48/0x60) from [<c0039574>] (warn_slowpath_null+0x18/0x1c)
[ 0.327941] [<c0039574>] (warn_slowpath_null+0x18/0x1c) from [<c02a59b4>] (kobject_get+0x24/0x48)
[ 0.337219] [<c02a59b4>] (kobject_get+0x24/0x48) from [<c02eb588>] (get_device+0x14/0x1c)
[ 0.345764] [<c02eb588>] (get_device+0x14/0x1c) from [<c02eb66c>] (device_add+0xc4/0x594)
[ 0.354370] [<c02eb66c>] (device_add+0xc4/0x594) from [<c03eeab4>] (of_platform_device_create_pdata+0x5c/0x7c)
[ 0.364807] [<c03eeab4>] (of_platform_device_create_pdata+0x5c/0x7c) from [<c03eec94>] (of_platform_bus_create+0x1c0/0x258)
[ 0.376403] [<c03eec94>] (of_platform_bus_create+0x1c0/0x258) from [<c03eee4c>] (of_platform_populate+0x5c/0x88)
[ 0.387023] [<c03eee4c>] (of_platform_populate+0x5c/0x88) from [<c07b3178>] (early_platform_driver_probe+0x1ac/0x23c)
[ 0.398101] [<c07b3178>] (early_platform_driver_probe+0x1ac/0x23c) from [<c0798030>] (plat_early_device_setup+0x2c/0x3c)
[ 0.409423] [<c0798030>] (plat_early_device_setup+0x2c/0x3c) from [<c078f8c4>] (do_one_initcall+0x90/0x164)
[ 0.419586] [<c078f8c4>] (do_one_initcall+0x90/0x164) from [<c078f9ec>] (kernel_init+0x54/0x1a4)
[ 0.428771] [<c078f9ec>] (kernel_init+0x54/0x1a4) from [<c0013818>] (kernel_thread_exit+0x0/0x8)
[ 0.437957] ---[ end trace da227214a82491b7 ]--
...
BR,
Konstantin Baydarov.
> +
> + return 0;
> +}
> +early_initcall(plat_early_device_setup);
> +
> static int omap_init_control(void)
> {
> struct omap_hwmod *oh;
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