drivers/video/backlight/tps65217_bl.c add default brightness value option

Signed-off-by: Matus Ujhelyi <matus.ujhelyi@streamunlimited.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 18 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/video/backlight/tps65217-backlight.txt b/Documentation/devicetree/bindings/video/backlight/tps65217-backlight.txt
index 76485247b35d..5fb9279ac287 100644
--- a/Documentation/devicetree/bindings/video/backlight/tps65217-backlight.txt
+++ b/Documentation/devicetree/bindings/video/backlight/tps65217-backlight.txt
@@ -9,6 +9,7 @@ Required properties:
 - backlight: node for specifying WLED1 and WLED2 lines in TPS65217
 - isel: selection bit, valid values: 1 for ISEL1 (low-level) and 2 for ISEL2 (high-level)
 - fdim: PWM dimming frequency, valid values: 100, 200, 500, 1000
+- default-brightness: valid values: 0-100
 
 Each regulator is defined using the standard binding for regulators.
 
@@ -20,5 +21,7 @@ Example:
                 backlight {
                         isel = <1>;  /* 1 - ISET1, 2 ISET2 */
                         fdim = <100>; /* TPS65217_BL_FDIM_100HZ */
+                        default-brightness = <50>;
                 };
         };
+
diff --git a/drivers/video/backlight/tps65217_bl.c b/drivers/video/backlight/tps65217_bl.c
index 70881633b45a..05782312aeb3 100644
--- a/drivers/video/backlight/tps65217_bl.c
+++ b/drivers/video/backlight/tps65217_bl.c
@@ -245,6 +245,18 @@ tps65217_bl_parse_dt(struct platform_device *pdev)
                 }
         }
 
+        if (!of_property_read_u32(node, "default-brightness", &val)) {
+                if (val < 0 ||
+                        val > 100) {
+                        dev_err(&pdev->dev,
+                                "invalid 'default-brightness' value in the device tree\n");
+                        err = ERR_PTR(-EINVAL);
+                        goto err;
+                }
+
+                pdata->dft_brightness = val;
+        }
+
         of_node_put(node);
 
         return pdata;
@@ -311,7 +323,8 @@ static int tps65217_bl_probe(struct platform_device *pdev)
                 return PTR_ERR(tps65217_bl->bl);
         }
 
-        tps65217_bl->bl->props.brightness = 0;
+        tps65217_bl->bl->props.brightness = pdata->dft_brightness;
+        backlight_update_status(tps65217_bl->bl);
         platform_set_drvdata(pdev, tps65217_bl);
 
         return 0;
diff --git a/include/linux/mfd/tps65217.h b/include/linux/mfd/tps65217.h
index 290762f93930..29eab2bd3dfa 100644
--- a/include/linux/mfd/tps65217.h
+++ b/include/linux/mfd/tps65217.h
@@ -228,6 +228,7 @@ enum tps65217_bl_fdim {
 struct tps65217_bl_pdata {
         enum tps65217_bl_isel isel;
         enum tps65217_bl_fdim fdim;
+        int dft_brightness;
 };
 
 /**