OMAP2PLUS:DSS2: add opt_clock_available in pdata

Provide a function in pdata to allow dss submodules to check if a given
clock is available on a platform as an optional clock.

Signed-off-by: Senthilvadivu Guruswamy <svadivu@ti.com>
(based on implementation from Senthil)

Signed-off-by: Sumit Semwal <sumit.semwal@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c
index 16d0db6718ae..256d23fb79ab 100644
--- a/arch/arm/mach-omap2/display.c
+++ b/arch/arm/mach-omap2/display.c
@@ -42,6 +42,20 @@ static struct omap_device_pm_latency omap_dss_latency[] = {
         },
 };
 
+/* oh_core is used for getting opt-clocks */
+static struct omap_hwmod        *oh_core;
+
+static bool opt_clock_available(const char *clk_role)
+{
+        int i;
+
+        for (i = 0; i < oh_core->opt_clks_cnt; i++) {
+                if (!strcmp(oh_core->opt_clks[i].role, clk_role))
+                        return true;
+        }
+        return false;
+}
+
 int __init omap_display_init(struct omap_dss_board_info *board_data)
 {
         int r = 0;
@@ -74,9 +88,16 @@ int __init omap_display_init(struct omap_dss_board_info *board_data)
                 oh_count = ARRAY_SIZE(oh_name) - 2;
                 /* last 2 hwmod dev in oh_name are not available for omap3 */
 
+        /* opt_clks are always associated with dss hwmod */
+        oh_core = omap_hwmod_lookup("dss_core");
+        if (!oh_core) {
+                pr_err("Could not look up dss_core.\n");
+                return -ENODEV;
+        }
 
         pdata.board_data = board_data;
         pdata.board_data->get_last_off_on_transaction_id = NULL;
+        pdata.opt_clock_available = opt_clock_available;
 
         for (i = 0; i < oh_count; i++) {
                 oh = omap_hwmod_lookup(oh_name[i]);
@@ -84,6 +105,7 @@ int __init omap_display_init(struct omap_dss_board_info *board_data)
                         pr_err("Could not look up %s\n", oh_name[i]);
                         return -ENODEV;
                 }
+
                 od = omap_device_build(dev_name[i], -1, oh, &pdata,
                                 sizeof(struct omap_display_platform_data),
                                 omap_dss_latency,