ARM: tegra: expose chip ID and revision

Expose Tegra chip ID and revision in /sys/devices/soc for user mode
usage

Signed-off-by: Danny Huang <dahuang@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 5b71469..59b7be7 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -675,6 +675,7 @@ config ARCH_TEGRA
        select HAVE_CLK
        select HAVE_SMP
        select MIGHT_HAVE_CACHE_L2X0
+       select SOC_BUS
        select SPARSE_IRQ
        select USE_OF
        help

diff --git a/arch/arm/mach-tegra/tegra.c b/arch/arm/mach-tegra/tegra.c
index 27232c9..84deeab 100644 (file)
--- a/arch/arm/mach-tegra/tegra.c
+++ b/arch/arm/mach-tegra/tegra.c
@@ -33,6 +33,8 @@
 #include <linux/io.h>
 #include <linux/i2c.h>
 #include <linux/i2c-tegra.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
 #include <linux/usb/tegra_usb_phy.h>
 
 #include <asm/mach-types.h>
@@ -42,6 +44,7 @@
 
 #include "board.h"
 #include "common.h"
+#include "fuse.h"
 #include "iomap.h"
 
 static struct tegra_ehci_platform_data tegra_ehci1_pdata = {
@@ -80,12 +83,36 @@ static struct of_dev_auxdata tegra20_auxdata_lookup[] __initdata = {
 
 static void __init tegra_dt_init(void)
 {
+       struct soc_device_attribute *soc_dev_attr;
+       struct soc_device *soc_dev;
+       struct device *parent = NULL;
+
+       soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+       if (!soc_dev_attr)
+               goto out;
+
+       soc_dev_attr->family = kasprintf(GFP_KERNEL, "Tegra");
+       soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d", tegra_revision);
+       soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%d", tegra_chip_id);
+
+       soc_dev = soc_device_register(soc_dev_attr);
+       if (IS_ERR(soc_dev)) {
+               kfree(soc_dev_attr->family);
+               kfree(soc_dev_attr->revision);
+               kfree(soc_dev_attr->soc_id);
+               kfree(soc_dev_attr);
+               goto out;
+       }
+
+       parent = soc_device_to_device(soc_dev);
+
        /*
         * Finished with the static registrations now; fill in the missing
         * devices
         */
+out:
        of_platform_populate(NULL, of_default_bus_match_table,
-                               tegra20_auxdata_lookup, NULL);
+                               tegra20_auxdata_lookup, parent);
 }
 
 static void __init trimslice_init(void)