powerpc/powernv: Create opal sysfs directory

Create /sys/firmware/opal directory. We wil use this
interface to fetch opal error logs, firmware update, etc.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 22 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 4cc33ba1edd3..ee0efd2f2abc 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -601,6 +601,9 @@ typedef struct oppanel_line {
         uint64_t        line_len;
 } oppanel_line_t;
 
+/* /sys/firmware/opal */
+extern struct kobject *opal_kobj;
+
 /* API functions */
 int64_t opal_console_write(int64_t term_number, __be64 *length,
                            const uint8_t *buffer);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 09336f0c54c5..37f06580709a 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -17,11 +17,15 @@
 #include <linux/interrupt.h>
 #include <linux/notifier.h>
 #include <linux/slab.h>
+#include <linux/kobject.h>
 #include <asm/opal.h>
 #include <asm/firmware.h>
 
 #include "powernv.h"
 
+/* /sys/firmware/opal */
+struct kobject *opal_kobj;
+
 struct opal {
         u64 base;
         u64 entry;
@@ -375,6 +379,17 @@ static irqreturn_t opal_interrupt(int irq, void *data)
         return IRQ_HANDLED;
 }
 
+static int opal_sysfs_init(void)
+{
+        opal_kobj = kobject_create_and_add("opal", firmware_kobj);
+        if (!opal_kobj) {
+                pr_warn("kobject_create_and_add opal failed\n");
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
 static int __init opal_init(void)
 {
         struct device_node *np, *consoles;
@@ -420,6 +435,10 @@ static int __init opal_init(void)
                                    " (0x%x)\n", rc, irq, hwirq);
                 opal_irqs[i] = irq;
         }
+
+        /* Create "opal" kobject under /sys/firmware */
+        rc = opal_sysfs_init();
+
         return 0;
 }
 subsys_initcall(opal_init);