ARM: ux500: export System-on-Chip information ux500 via sysfs

Here we make use of the new System-On-Chip bus driver to export
vital SoC information out to userspace via sysfs. This patch
provides a data structure of strings to populate the base
nodes found in:

/sys/devices/soc[0|1|2|...]/[family|machine|revision|soc_id].

It also adds one more node as requested by ST-Ericsson.
'process' depicts the way in which the silicon was manufactured.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 27 insertions, 6 deletions

diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index 1e8a2cb7e503..afcde3df71d7 100644
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -24,6 +24,7 @@
 #include <mach/setup.h>
 #include <mach/devices.h>
 #include <mach/usb.h>
+#include <mach/db8500-regs.h>
 
 #include "devices-db8500.h"
 #include "ste-dma40-db8500.h"
@@ -164,18 +165,38 @@ static int usb_db8500_tx_dma_cfg[] = {
         DB8500_DMA_DEV39_USB_OTG_OEP_8
 };
 
+static const char *db8500_read_soc_id(void)
+{
+        void __iomem *uid = __io_address(U8500_BB_UID_BASE);
+
+        return kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
+                         readl((u32 *)uid+1),
+                         readl((u32 *)uid+1), readl((u32 *)uid+2),
+                         readl((u32 *)uid+3), readl((u32 *)uid+4));
+}
+
+static struct device * __init db8500_soc_device_init(void)
+{
+        const char *soc_id = db8500_read_soc_id();
+
+        return ux500_soc_device_init(soc_id);
+}
+
 /*
  * This function is called from the board init
  */
-struct device* __init u8500_init_devices(void)
+struct device * __init u8500_init_devices(void)
 {
-        db8500_add_rtc(NULL);
-        db8500_add_gpios(NULL);
-        db8500_add_usb(NULL, usb_db8500_rx_dma_cfg, usb_db8500_tx_dma_cfg);
+        struct device *parent;
+
+        parent = db8500_soc_device_init();
+
+        db8500_add_rtc(parent);
+        db8500_add_gpios(parent);
+        db8500_add_usb(parent, usb_db8500_rx_dma_cfg, usb_db8500_tx_dma_cfg);
 
         platform_device_register_simple("cpufreq-u8500", -1, NULL, 0);
         platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));
 
-        /* FIXME: Return value to be a real parent. */
-        return NULL;
+        return parent;
 }