[media] smiapp: Allow using external clock from the clock framework

Instead of providing a function in platform data, allow also providing the
name of the external clock and use it through the clock framework.

Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 50 insertions, 7 deletions

diff --git a/drivers/media/video/smiapp/smiapp-core.c b/drivers/media/video/smiapp/smiapp-core.c
index a8a1db9563b1..999f3fc867c7 100644
--- a/drivers/media/video/smiapp/smiapp-core.c
+++ b/drivers/media/video/smiapp/smiapp-core.c
@@ -26,6 +26,7 @@
  *
  */
 
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/gpio.h>
@@ -1111,8 +1112,11 @@ static int smiapp_power_on(struct smiapp_sensor *sensor)
         }
         usleep_range(1000, 1000);
 
-        rval = sensor->platform_data->set_xclk(&sensor->src->sd,
-                                        sensor->platform_data->ext_clk);
+        if (sensor->platform_data->set_xclk)
+                rval = sensor->platform_data->set_xclk(
+                        &sensor->src->sd, sensor->platform_data->ext_clk);
+        else
+                rval = clk_enable(sensor->ext_clk);
         if (rval < 0) {
                 dev_dbg(&client->dev, "failed to set xclk\n");
                 goto out_xclk_fail;
@@ -1231,7 +1235,10 @@ static int smiapp_power_on(struct smiapp_sensor *sensor)
 out_cci_addr_fail:
         if (sensor->platform_data->xshutdown != SMIAPP_NO_XSHUTDOWN)
                 gpio_set_value(sensor->platform_data->xshutdown, 0);
-        sensor->platform_data->set_xclk(&sensor->src->sd, 0);
+        if (sensor->platform_data->set_xclk)
+                sensor->platform_data->set_xclk(&sensor->src->sd, 0);
+        else
+                clk_disable(sensor->ext_clk);
 
 out_xclk_fail:
         regulator_disable(sensor->vana);
@@ -1256,7 +1263,10 @@ static void smiapp_power_off(struct smiapp_sensor *sensor)
 
         if (sensor->platform_data->xshutdown != SMIAPP_NO_XSHUTDOWN)
                 gpio_set_value(sensor->platform_data->xshutdown, 0);
-        sensor->platform_data->set_xclk(&sensor->src->sd, 0);
+        if (sensor->platform_data->set_xclk)
+                sensor->platform_data->set_xclk(&sensor->src->sd, 0);
+        else
+                clk_disable(sensor->ext_clk);
         usleep_range(5000, 5000);
         regulator_disable(sensor->vana);
         sensor->streaming = 0;
@@ -2327,6 +2337,28 @@ static int smiapp_registered(struct v4l2_subdev *subdev)
                 return -ENODEV;
         }
 
+        if (!sensor->platform_data->set_xclk) {
+                sensor->ext_clk = clk_get(&client->dev,
+                                          sensor->platform_data->ext_clk_name);
+                if (IS_ERR(sensor->ext_clk)) {
+                        dev_err(&client->dev, "could not get clock %s\n",
+                                sensor->platform_data->ext_clk_name);
+                        rval = -ENODEV;
+                        goto out_clk_get;
+                }
+
+                rval = clk_set_rate(sensor->ext_clk,
+                                    sensor->platform_data->ext_clk);
+                if (rval < 0) {
+                        dev_err(&client->dev,
+                                "unable to set clock %s freq to %u\n",
+                                sensor->platform_data->ext_clk_name,
+                                sensor->platform_data->ext_clk);
+                        rval = -ENODEV;
+                        goto out_clk_set_rate;
+                }
+        }
+
         if (sensor->platform_data->xshutdown != SMIAPP_NO_XSHUTDOWN) {
                 if (gpio_request_one(sensor->platform_data->xshutdown, 0,
                                      "SMIA++ xshutdown") != 0) {
@@ -2334,7 +2366,7 @@ static int smiapp_registered(struct v4l2_subdev *subdev)
                                 "unable to acquire reset gpio %d\n",
                                 sensor->platform_data->xshutdown);
                         rval = -ENODEV;
-                        goto out_gpio_request;
+                        goto out_clk_set_rate;
                 }
         }
 
@@ -2589,7 +2621,11 @@ out_smiapp_power_on:
         if (sensor->platform_data->xshutdown != SMIAPP_NO_XSHUTDOWN)
                 gpio_free(sensor->platform_data->xshutdown);
 
-out_gpio_request:
+out_clk_set_rate:
+        clk_put(sensor->ext_clk);
+        sensor->ext_clk = NULL;
+
+out_clk_get:
         regulator_put(sensor->vana);
         sensor->vana = NULL;
         return rval;
@@ -2778,7 +2814,10 @@ static int __exit smiapp_remove(struct i2c_client *client)
         if (sensor->power_count) {
                 if (sensor->platform_data->xshutdown != SMIAPP_NO_XSHUTDOWN)
                         gpio_set_value(sensor->platform_data->xshutdown, 0);
-                sensor->platform_data->set_xclk(&sensor->src->sd, 0);
+                if (sensor->platform_data->set_xclk)
+                        sensor->platform_data->set_xclk(&sensor->src->sd, 0);
+                else
+                        clk_disable(sensor->ext_clk);
                 sensor->power_count = 0;
         }
 
@@ -2794,6 +2833,8 @@ static int __exit smiapp_remove(struct i2c_client *client)
         smiapp_free_controls(sensor);
         if (sensor->platform_data->xshutdown != SMIAPP_NO_XSHUTDOWN)
                 gpio_free(sensor->platform_data->xshutdown);
+        if (sensor->ext_clk)
+                clk_put(sensor->ext_clk);
         if (sensor->vana)
                 regulator_put(sensor->vana);
 
diff --git a/drivers/media/video/smiapp/smiapp.h b/drivers/media/video/smiapp/smiapp.h
index 35b9216e48cd..587f7f11238d 100644
--- a/drivers/media/video/smiapp/smiapp.h
+++ b/drivers/media/video/smiapp/smiapp.h
@@ -198,6 +198,7 @@ struct smiapp_sensor {
         struct smiapp_subdev *pixel_array;
         struct smiapp_platform_data *platform_data;
         struct regulator *vana;
+        struct clk *ext_clk;
         u32 limits[SMIAPP_LIMIT_LAST];
         u8 nbinning_subtypes;
         struct smiapp_binning_subtype binning_subtypes[SMIAPP_BINNING_SUBTYPES];
diff --git a/include/media/smiapp.h b/include/media/smiapp.h
index a7877cd0733d..9ab07fd45d5c 100644
--- a/include/media/smiapp.h
+++ b/include/media/smiapp.h
@@ -77,6 +77,7 @@ struct smiapp_platform_data {
         struct smiapp_flash_strobe_parms *strobe_setup;
 
         int (*set_xclk)(struct v4l2_subdev *sd, int hz);
+        char *ext_clk_name;
         int xshutdown;                  /* gpio or SMIAPP_NO_XSHUTDOWN */
 };