This patch adds clock provider to expose the sclk_cam0/1 clocks
for image sensor subdevs.
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
.../devicetree/bindings/media/samsung-fimc.txt | 17 ++-
drivers/media/platform/exynos4-is/media-dev.c | 115 ++++++++++++++++++++
drivers/media/platform/exynos4-is/media-dev.h | 18 ++-
3 files changed, 147 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/media/samsung-fimc.txt b/Documentation/devicetree/bindings/media/samsung-fimc.txt
index 96312f6..9f4d295 100644
--- a/Documentation/devicetree/bindings/media/samsung-fimc.txt
+++ b/Documentation/devicetree/bindings/media/samsung-fimc.txt
@@ -91,6 +91,15 @@ Optional properties
- samsung,camclk-out : specifies clock output for remote sensor,
0 - CAM_A_CLKOUT, 1 - CAM_B_CLKOUT;
+'clock-controller' node (optional)
+----------------------------------
+
+The purpose of this node is to define a clock provider for external image
+sensors and link any of the CAM_?_CLKOUT clock outputs with related external
+clock consumer device. Properties specific to this node are described in
+../clock/clock-bindings.txt.
+
+
Image sensor nodes
------------------
@@ -114,7 +123,7 @@ Example:
vddio-supply = <...>;
clock-frequency = <24000000>;
- clocks = <...>;
+ clocks = <&camclk 1>;
clock-names = "mclk";
port {
@@ -135,7 +144,7 @@ Example:
vddio-supply = <...>;
clock-frequency = <24000000>;
- clocks = <...>;
+ clocks = <&camclk 0>;
clock-names = "mclk";
port {
@@ -156,6 +165,10 @@ Example:
pinctrl-names = "default";
pinctrl-0 = <&cam_port_a_clk_active>;
+ camclk: clock-controller {
+ #clock-cells = <1>;
+ };
+
/* parallel camera ports */
parallel-ports {
/* camera A input */
diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index e327f45..6fba5f6 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -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>
@@ -1438,6 +1440,108 @@ 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 const char *cam_clk_p_names[] = { "sclk_cam0", "sclk_cam1" };
+
+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 < ARRAY_SIZE(cp->clks); i++)
+ if (!IS_ERR(cp->clks[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;
+ struct device_node *node;
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(cp->clks); i++)
+ cp->clks[i] = ERR_PTR(-EINVAL);
+
+ node = of_get_child_by_name(dev->of_node, "clock-controller");
+ if (!node) {
+ dev_warn(dev, "clock-controller node at %s not found\n",
+ dev->of_node->full_name);
+ return 0;
+ }
+ for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
+ struct cam_clk *camclk = &cp->camclk[i];
+ struct clk_init_data init;
+ char clk_name[16];
+ struct clk *clk;
+
+ snprintf(clk_name, sizeof(clk_name), "cam_clkout%d", i);
+
+ init.name = clk_name;
+ init.ops = &cam_clk_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ init.parent_names = &cam_clk_p_names[i];
+ init.num_parents = 1;
+ camclk->hw.init = &init;
+ camclk->fmd = fmd;
+
+ clk = clk_register(dev, &camclk->hw);
+ if (IS_ERR(clk)) {
+ dev_err(dev, "failed to register clock: %s (%ld)\n",
+ clk_name, PTR_ERR(clk));
+ ret = PTR_ERR(clk);
+ goto err;
+ }
+ cp->clks[i] = clk;
+ }
+
+ cp->clk_data.clks = cp->clks;
+ cp->clk_data.clk_num = i;
+ cp->of_node = node;
+
+ ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+ &cp->clk_data);
+ if (!ret)
+ 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;
@@ -1465,16 +1569,24 @@ 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;
@@ -1508,6 +1620,7 @@ 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;
@@ -1528,6 +1641,7 @@ err_clk:
media_device_unregister(&fmd->media_dev);
err_md:
v4l2_device_unregister(&fmd->v4l2_dev);
+ fimc_md_unregister_clk_provider(fmd);
return ret;
}
@@ -1538,6 +1652,7 @@ 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);
diff --git a/drivers/media/platform/exynos4-is/media-dev.h b/drivers/media/platform/exynos4-is/media-dev.h
index 62599fd..240ca71 100644
--- a/drivers/media/platform/exynos4-is/media-dev.h
+++ b/drivers/media/platform/exynos4-is/media-dev.h
@@ -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 +130,21 @@ 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];
+ } clk_provider;
+
+ bool user_subdev_api;
spinlock_t slock;
struct list_head pipelines;
};
--
1.7.9.5
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