@@ -11,6 +11,8 @@
*/
#include <linux/bug.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/i2c.h>
@@ -1276,6 +1278,14 @@ int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on)
struct fimc_source_info *si = v4l2_get_subdev_hostdata(sd);
struct fimc_md *fmd = entity_to_fimc_mdev(&sd->entity);
+ /*
+ * If there is a clock provider registered the sensors will
+ * handle their clock themselves, no need to control it on
+ * the host interface side.
+ */
+ if (fmd->clk_provider.num_clocks > 0)
+ return 0;
+
return __fimc_md_set_camclk(fmd, si, on);
}
@@ -1437,6 +1447,103 @@ static int fimc_md_get_pinctrl(struct fimc_md *fmd)
return 0;
}
+#ifdef CONFIG_OF
+static int cam_clk_prepare(struct clk_hw *hw)
+{
+ struct cam_clk *camclk = to_cam_clk(hw);
+ int ret;
+
+ if (camclk->fmd->pmf == NULL)
+ return -ENODEV;
+
+ ret = pm_runtime_get_sync(camclk->fmd->pmf);
+ return ret < 0 ? ret : 0;
+}
+
+static void cam_clk_unprepare(struct clk_hw *hw)
+{
+ struct cam_clk *camclk = to_cam_clk(hw);
+
+ if (camclk->fmd->pmf == NULL)
+ return;
+
+ pm_runtime_put_sync(camclk->fmd->pmf);
+}
+
+static const struct clk_ops cam_clk_ops = {
+ .prepare = cam_clk_prepare,
+ .unprepare = cam_clk_unprepare,
+};
+
+static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
+{
+ struct cam_clk_provider *cp = &fmd->clk_provider;
+ unsigned int i;
+
+ if (cp->of_node)
+ of_clk_del_provider(cp->of_node);
+
+ for (i = 0; i < cp->num_clocks; i++)
+ clk_unregister(cp->clks[i]);
+}
+
+static int fimc_md_register_clk_provider(struct fimc_md *fmd)
+{
+ struct cam_clk_provider *cp = &fmd->clk_provider;
+ struct device *dev = &fmd->pdev->dev;
+ int i, ret;
+
+ for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
+ struct cam_clk *camclk = &cp->camclk[i];
+ struct clk_init_data init;
+ const char *p_name;
+
+ ret = of_property_read_string_index(dev->of_node,
+ "clock-output-names", i, &init.name);
+ if (ret < 0)
+ break;
+
+ p_name = __clk_get_name(fmd->camclk[i].clock);
+
+ /* It's safe since clk_register() will duplicate the string. */
+ init.parent_names = &p_name;
+ init.num_parents = 1;
+ init.ops = &cam_clk_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ camclk->hw.init = &init;
+ camclk->fmd = fmd;
+
+ cp->clks[i] = clk_register(NULL, &camclk->hw);
+ if (IS_ERR(cp->clks[i])) {
+ dev_err(dev, "failed to register clock: %s (%ld)\n",
+ init.name, PTR_ERR(cp->clks[i]));
+ ret = PTR_ERR(cp->clks[i]);
+ goto err;
+ }
+ cp->num_clocks++;
+ }
+
+ if (cp->num_clocks == 0) {
+ dev_warn(dev, "clk provider not registered\n");
+ return 0;
+ }
+
+ cp->clk_data.clks = cp->clks;
+ cp->clk_data.clk_num = cp->num_clocks;
+ cp->of_node = dev->of_node;
+ ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
+ &cp->clk_data);
+ if (ret == 0)
+ return 0;
+err:
+ fimc_md_unregister_clk_provider(fmd);
+ return ret;
+}
+#else
+#define fimc_md_register_clk_provider(fmd) (0)
+#define fimc_md_unregister_clk_provider(fmd) (0)
+#endif
+
static int fimc_md_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -1464,16 +1571,24 @@ static int fimc_md_probe(struct platform_device *pdev)
fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
+ ret = fimc_md_register_clk_provider(fmd);
+ if (ret < 0) {
+ v4l2_err(v4l2_dev, "clock provider registration failed\n");
+ return ret;
+ }
+
ret = v4l2_device_register(dev, &fmd->v4l2_dev);
if (ret < 0) {
v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
return ret;
}
+
ret = media_device_register(&fmd->media_dev);
if (ret < 0) {
v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
goto err_md;
}
+
ret = fimc_md_get_clocks(fmd);
if (ret)
goto err_clk;
@@ -1507,6 +1622,7 @@ static int fimc_md_probe(struct platform_device *pdev)
ret = fimc_md_create_links(fmd);
if (ret)
goto err_unlock;
+
ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
if (ret)
goto err_unlock;
@@ -1527,6 +1643,7 @@ err_clk:
media_device_unregister(&fmd->media_dev);
err_md:
v4l2_device_unregister(&fmd->v4l2_dev);
+ fimc_md_unregister_clk_provider(fmd);
return ret;
}
@@ -1537,6 +1654,7 @@ static int fimc_md_remove(struct platform_device *pdev)
if (!fmd)
return 0;
+ fimc_md_unregister_clk_provider(fmd);
v4l2_device_unregister(&fmd->v4l2_dev);
device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
fimc_md_unregister_entities(fmd);
@@ -10,6 +10,7 @@
#define FIMC_MDEVICE_H_
#include <linux/clk.h>
+#include <linux/clk-provider.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/of.h>
@@ -89,6 +90,12 @@ struct fimc_sensor_info {
struct fimc_dev *host;
};
+struct cam_clk {
+ struct clk_hw hw;
+ struct fimc_md *fmd;
+};
+#define to_cam_clk(_hw) container_of(_hw, struct cam_clk, hw)
+
/**
* struct fimc_md - fimc media device information
* @csis: MIPI CSIS subdevs data
@@ -105,6 +112,7 @@ struct fimc_sensor_info {
* @pinctrl: camera port pinctrl handle
* @state_default: pinctrl default state handle
* @state_idle: pinctrl idle state handle
+ * @cam_clk_provider: CAMCLK clock provider structure
* @user_subdev_api: true if subdevs are not configured by the host driver
* @slock: spinlock protecting @sensor array
*/
@@ -122,13 +130,22 @@ struct fimc_md {
struct media_device media_dev;
struct v4l2_device v4l2_dev;
struct platform_device *pdev;
+
struct fimc_pinctrl {
struct pinctrl *pinctrl;
struct pinctrl_state *state_default;
struct pinctrl_state *state_idle;
} pinctl;
- bool user_subdev_api;
+ struct cam_clk_provider {
+ struct clk *clks[FIMC_MAX_CAMCLKS];
+ struct clk_onecell_data clk_data;
+ struct device_node *of_node;
+ struct cam_clk camclk[FIMC_MAX_CAMCLKS];
+ int num_clocks;
+ } clk_provider;
+
+ bool user_subdev_api;
spinlock_t slock;
struct list_head pipelines;
};