SPEAr: Add DT bindings for SPEAr's timer

All SPEAr SoC's use ST's Timer module. This patch adds device tree probing
capability for that.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 22 insertions, 9 deletions

diff --git a/arch/arm/plat-spear/time.c b/arch/arm/plat-spear/time.c
index a3164d1647fd..9a378987bbb1 100644
--- a/arch/arm/plat-spear/time.c
+++ b/arch/arm/plat-spear/time.c
@@ -18,6 +18,8 @@
 #include <linux/ioport.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
 #include <linux/time.h>
 #include <linux/irq.h>
 #include <asm/mach/time.h>
@@ -197,19 +199,32 @@ static void __init spear_clockevent_init(int irq)
         setup_irq(irq, &spear_timer_irq);
 }
 
-void __init spear_setup_timer(resource_size_t base, int irq)
+const static struct of_device_id timer_of_match[] __initconst = {
+        { .compatible = "st,spear-timer", },
+        { },
+};
+
+void __init spear_setup_of_timer(void)
 {
-        int ret;
+        struct device_node *np;
+        int irq, ret;
+
+        np = of_find_matching_node(NULL, timer_of_match);
+        if (!np) {
+                pr_err("%s: No timer passed via DT\n", __func__);
+                return;
+        }
 
-        if (!request_mem_region(base, SZ_1K, "gpt0")) {
-                pr_err("%s:cannot get IO addr\n", __func__);
+        irq = irq_of_parse_and_map(np, 0);
+        if (!irq) {
+                pr_err("%s: No irq passed for timer via DT\n", __func__);
                 return;
         }
 
-        gpt_base = ioremap(base, SZ_1K);
+        gpt_base = of_iomap(np, 0);
         if (!gpt_base) {
-                pr_err("%s:ioremap failed for gpt\n", __func__);
-                goto err_mem;
+                pr_err("%s: of iomap failed\n", __func__);
+                return;
         }
 
         gpt_clk = clk_get_sys("gpt0", NULL);
@@ -233,6 +248,4 @@ err_clk:
         clk_put(gpt_clk);
 err_iomap:
         iounmap(gpt_base);
-err_mem:
-        release_mem_region(base, SZ_1K);
 }