[PATCH v5 05/10] V4L: s5c73m3: Add device tree support
Sylwester Nawrocki
s.nawrocki at samsung.com
Mon Feb 24 12:35:17 EST 2014
This patch adds the V4L2 asynchronous subdev registration and
device tree support. Common clock API is used to control the
sensor master clock from within the subdev.
Signed-off-by: Andrzej Hajda <a.hajda at samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>
Acked-by: Kyungmin Park <kyungmin.park at samsung.com>
---
Changes since v4:
- none.
Changes since v3:
- move clk_get from subdev s_power() to driver probe() callback and
make it devm_clk_get(),
- pass any errors from dev_clk_get() through, rather than overwriting
with EPROBE_DEFER. Patch [1] is required for things to work correctly
after this change.
[1] http://www.spinics.net/lists/arm-kernel/msg306072.html
---
drivers/media/i2c/s5c73m3/s5c73m3-core.c | 207 ++++++++++++++++++++++--------
drivers/media/i2c/s5c73m3/s5c73m3-spi.c | 6 +
drivers/media/i2c/s5c73m3/s5c73m3.h | 4 +
3 files changed, 167 insertions(+), 50 deletions(-)
diff --git a/drivers/media/i2c/s5c73m3/s5c73m3-core.c b/drivers/media/i2c/s5c73m3/s5c73m3-core.c
index e7f555c..a445930 100644
--- a/drivers/media/i2c/s5c73m3/s5c73m3-core.c
+++ b/drivers/media/i2c/s5c73m3/s5c73m3-core.c
@@ -15,7 +15,7 @@
* GNU General Public License for more details.
*/
-#include <linux/sizes.h>
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/gpio.h>
@@ -23,7 +23,9 @@
#include <linux/init.h>
#include <linux/media.h>
#include <linux/module.h>
+#include <linux/of_gpio.h>
#include <linux/regulator/consumer.h>
+#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/videodev2.h>
@@ -33,6 +35,7 @@
#include <media/v4l2-subdev.h>
#include <media/v4l2-mediabus.h>
#include <media/s5c73m3.h>
+#include <media/v4l2-of.h>
#include "s5c73m3.h"
@@ -46,6 +49,8 @@ static int update_fw;
module_param(update_fw, int, 0644);
#define S5C73M3_EMBEDDED_DATA_MAXLEN SZ_4K
+#define S5C73M3_MIPI_DATA_LANES 4
+#define S5C73M3_CLK_NAME "cis_extclk"
static const char * const s5c73m3_supply_names[S5C73M3_MAX_SUPPLIES] = {
"vdd-int", /* Digital Core supply (1.2V), CAM_ISP_CORE_1.2V */
@@ -1355,9 +1360,20 @@ static int __s5c73m3_power_on(struct s5c73m3 *state)
for (i = 0; i < S5C73M3_MAX_SUPPLIES; i++) {
ret = regulator_enable(state->supplies[i].consumer);
if (ret)
- goto err;
+ goto err_reg_dis;
}
+ ret = clk_set_rate(state->clock, state->mclk_frequency);
+ if (ret < 0)
+ goto err_reg_dis;
+
+ ret = clk_prepare_enable(state->clock);
+ if (ret < 0)
+ goto err_reg_dis;
+
+ v4l2_dbg(1, s5c73m3_dbg, &state->oif_sd, "clock frequency: %ld\n",
+ clk_get_rate(state->clock));
+
s5c73m3_gpio_deassert(state, STBY);
usleep_range(100, 200);
@@ -1365,7 +1381,8 @@ static int __s5c73m3_power_on(struct s5c73m3 *state)
usleep_range(50, 100);
return 0;
-err:
+
+err_reg_dis:
for (--i; i >= 0; i--)
regulator_disable(state->supplies[i].consumer);
return ret;
@@ -1380,6 +1397,9 @@ static int __s5c73m3_power_off(struct s5c73m3 *state)
if (s5c73m3_gpio_assert(state, STBY))
usleep_range(100, 200);
+
+ clk_disable_unprepare(state->clock);
+
state->streaming = 0;
state->isp_ready = 0;
@@ -1388,6 +1408,7 @@ static int __s5c73m3_power_off(struct s5c73m3 *state)
if (ret)
goto err;
}
+
return 0;
err:
for (++i; i < S5C73M3_MAX_SUPPLIES; i++) {
@@ -1396,6 +1417,8 @@ err:
v4l2_err(&state->oif_sd, "Failed to reenable %s: %d\n",
state->supplies[i].supply, r);
}
+
+ clk_prepare_enable(state->clock);
return ret;
}
@@ -1451,17 +1474,6 @@ static int s5c73m3_oif_registered(struct v4l2_subdev *sd)
S5C73M3_JPEG_PAD, &state->oif_sd.entity, OIF_JPEG_PAD,
MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
- mutex_lock(&state->lock);
- ret = __s5c73m3_power_on(state);
- if (ret == 0)
- s5c73m3_get_fw_version(state);
-
- __s5c73m3_power_off(state);
- mutex_unlock(&state->lock);
-
- v4l2_dbg(1, s5c73m3_dbg, sd, "%s: Booting %s (%d)\n",
- __func__, ret ? "failed" : "succeeded", ret);
-
return ret;
}
@@ -1519,41 +1531,112 @@ static const struct v4l2_subdev_ops oif_subdev_ops = {
.video = &s5c73m3_oif_video_ops,
};
-static int s5c73m3_configure_gpios(struct s5c73m3 *state,
- const struct s5c73m3_platform_data *pdata)
+static int s5c73m3_configure_gpios(struct s5c73m3 *state)
+{
+ static const char * const gpio_names[] = {
+ "S5C73M3_STBY", "S5C73M3_RST"
+ };
+ struct i2c_client *c = state->i2c_client;
+ struct s5c73m3_gpio *g = state->gpio;
+ int ret, i;
+
+ for (i = 0; i < GPIO_NUM; ++i) {
+ unsigned int flags = GPIOF_DIR_OUT;
+ if (g[i].level)
+ flags |= GPIOF_INIT_HIGH;
+ ret = devm_gpio_request_one(&c->dev, g[i].gpio, flags,
+ gpio_names[i]);
+ if (ret) {
+ v4l2_err(c, "failed to request gpio %s\n",
+ gpio_names[i]);
+ return ret;
+ }
+ }
+ return 0;
+}
+
+static int s5c73m3_parse_gpios(struct s5c73m3 *state)
+{
+ static const char * const prop_names[] = {
+ "standby-gpios", "xshutdown-gpios",
+ };
+ struct device *dev = &state->i2c_client->dev;
+ struct device_node *node = dev->of_node;
+ int ret, i;
+
+ for (i = 0; i < GPIO_NUM; ++i) {
+ enum of_gpio_flags of_flags;
+
+ ret = of_get_named_gpio_flags(node, prop_names[i],
+ 0, &of_flags);
+ if (ret < 0) {
+ dev_err(dev, "failed to parse %s DT property\n",
+ prop_names[i]);
+ return -EINVAL;
+ }
+ state->gpio[i].gpio = ret;
+ state->gpio[i].level = !(of_flags & OF_GPIO_ACTIVE_LOW);
+ }
+ return 0;
+}
+
+static int s5c73m3_get_platform_data(struct s5c73m3 *state)
{
struct device *dev = &state->i2c_client->dev;
- const struct s5c73m3_gpio *gpio;
- unsigned long flags;
+ const struct s5c73m3_platform_data *pdata = dev->platform_data;
+ struct device_node *node = dev->of_node;
+ struct device_node *node_ep;
+ struct v4l2_of_endpoint ep;
int ret;
- state->gpio[STBY].gpio = -EINVAL;
- state->gpio[RST].gpio = -EINVAL;
+ if (!node) {
+ if (!pdata) {
+ dev_err(dev, "Platform data not specified\n");
+ return -EINVAL;
+ }
- gpio = &pdata->gpio_stby;
- if (gpio_is_valid(gpio->gpio)) {
- flags = (gpio->level ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW)
- | GPIOF_EXPORT;
- ret = devm_gpio_request_one(dev, gpio->gpio, flags,
- "S5C73M3_STBY");
- if (ret < 0)
- return ret;
+ state->mclk_frequency = pdata->mclk_frequency;
+ state->gpio[STBY] = pdata->gpio_stby;
+ state->gpio[RST] = pdata->gpio_reset;
+ return 0;
+ }
+
+ state->clock = devm_clk_get(dev, S5C73M3_CLK_NAME);
+ if (IS_ERR(state->clock))
+ return PTR_ERR(state->clock);
- state->gpio[STBY] = *gpio;
+ if (of_property_read_u32(node, "clock-frequency",
+ &state->mclk_frequency)) {
+ state->mclk_frequency = S5C73M3_DEFAULT_MCLK_FREQ;
+ dev_info(dev, "using default %u Hz clock frequency\n",
+ state->mclk_frequency);
}
- gpio = &pdata->gpio_reset;
- if (gpio_is_valid(gpio->gpio)) {
- flags = (gpio->level ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW)
- | GPIOF_EXPORT;
- ret = devm_gpio_request_one(dev, gpio->gpio, flags,
- "S5C73M3_RST");
- if (ret < 0)
- return ret;
+ ret = s5c73m3_parse_gpios(state);
+ if (ret < 0)
+ return -EINVAL;
- state->gpio[RST] = *gpio;
+ node_ep = v4l2_of_get_next_endpoint(node, NULL);
+ if (!node_ep) {
+ dev_warn(dev, "no endpoint defined for node: %s\n",
+ node->full_name);
+ return 0;
}
+ v4l2_of_parse_endpoint(node_ep, &ep);
+ of_node_put(node_ep);
+
+ if (ep.bus_type != V4L2_MBUS_CSI2) {
+ dev_err(dev, "unsupported bus type\n");
+ return -EINVAL;
+ }
+ /*
+ * Number of MIPI CSI-2 data lanes is currently not configurable,
+ * always a default value of 4 lanes is used.
+ */
+ if (ep.bus.mipi_csi2.num_data_lanes != S5C73M3_MIPI_DATA_LANES)
+ dev_info(dev, "falling back to 4 MIPI CSI-2 data lanes\n");
+
return 0;
}
@@ -1561,21 +1644,20 @@ static int s5c73m3_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
- const struct s5c73m3_platform_data *pdata = client->dev.platform_data;
struct v4l2_subdev *sd;
struct v4l2_subdev *oif_sd;
struct s5c73m3 *state;
int ret, i;
- if (pdata == NULL) {
- dev_err(&client->dev, "Platform data not specified\n");
- return -EINVAL;
- }
-
state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
if (!state)
return -ENOMEM;
+ state->i2c_client = client;
+ ret = s5c73m3_get_platform_data(state);
+ if (ret < 0)
+ return ret;
+
mutex_init(&state->lock);
sd = &state->sensor_sd;
oif_sd = &state->oif_sd;
@@ -1613,11 +1695,7 @@ static int s5c73m3_probe(struct i2c_client *client,
if (ret < 0)
return ret;
- state->mclk_frequency = pdata->mclk_frequency;
- state->bus_type = pdata->bus_type;
- state->i2c_client = client;
-
- ret = s5c73m3_configure_gpios(state, pdata);
+ ret = s5c73m3_configure_gpios(state);
if (ret)
goto out_err;
@@ -1651,9 +1729,29 @@ static int s5c73m3_probe(struct i2c_client *client,
if (ret < 0)
goto out_err;
+ oif_sd->dev = dev;
+
+ ret = __s5c73m3_power_on(state);
+ if (ret < 0)
+ goto out_err1;
+
+ ret = s5c73m3_get_fw_version(state);
+ __s5c73m3_power_off(state);
+
+ if (ret < 0) {
+ dev_err(dev, "Device detection failed: %d\n", ret);
+ goto out_err1;
+ }
+
+ ret = v4l2_async_register_subdev(oif_sd);
+ if (ret < 0)
+ goto out_err1;
+
v4l2_info(sd, "%s: completed successfully\n", __func__);
return 0;
+out_err1:
+ s5c73m3_unregister_spi_driver(state);
out_err:
media_entity_cleanup(&sd->entity);
return ret;
@@ -1665,7 +1763,7 @@ static int s5c73m3_remove(struct i2c_client *client)
struct s5c73m3 *state = oif_sd_to_s5c73m3(oif_sd);
struct v4l2_subdev *sensor_sd = &state->sensor_sd;
- v4l2_device_unregister_subdev(oif_sd);
+ v4l2_async_unregister_subdev(oif_sd);
v4l2_ctrl_handler_free(oif_sd->ctrl_handler);
media_entity_cleanup(&oif_sd->entity);
@@ -1684,8 +1782,17 @@ static const struct i2c_device_id s5c73m3_id[] = {
};
MODULE_DEVICE_TABLE(i2c, s5c73m3_id);
+#ifdef CONFIG_OF
+static const struct of_device_id s5c73m3_of_match[] = {
+ { .compatible = "samsung,s5c73m3" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, s5c73m3_of_match);
+#endif
+
static struct i2c_driver s5c73m3_i2c_driver = {
.driver = {
+ .of_match_table = of_match_ptr(s5c73m3_of_match),
.name = DRIVER_NAME,
},
.probe = s5c73m3_probe,
diff --git a/drivers/media/i2c/s5c73m3/s5c73m3-spi.c b/drivers/media/i2c/s5c73m3/s5c73m3-spi.c
index 8079e26..f60b265 100644
--- a/drivers/media/i2c/s5c73m3/s5c73m3-spi.c
+++ b/drivers/media/i2c/s5c73m3/s5c73m3-spi.c
@@ -27,6 +27,11 @@
#define S5C73M3_SPI_DRV_NAME "S5C73M3-SPI"
+static const struct of_device_id s5c73m3_spi_ids[] = {
+ { .compatible = "samsung,s5c73m3" },
+ { }
+};
+
enum spi_direction {
SPI_DIR_RX,
SPI_DIR_TX
@@ -146,6 +151,7 @@ int s5c73m3_register_spi_driver(struct s5c73m3 *state)
spidrv->driver.name = S5C73M3_SPI_DRV_NAME;
spidrv->driver.bus = &spi_bus_type;
spidrv->driver.owner = THIS_MODULE;
+ spidrv->driver.of_match_table = s5c73m3_spi_ids;
return spi_register_driver(spidrv);
}
diff --git a/drivers/media/i2c/s5c73m3/s5c73m3.h b/drivers/media/i2c/s5c73m3/s5c73m3.h
index 9dfa516..9656b67 100644
--- a/drivers/media/i2c/s5c73m3/s5c73m3.h
+++ b/drivers/media/i2c/s5c73m3/s5c73m3.h
@@ -17,6 +17,7 @@
#ifndef S5C73M3_H_
#define S5C73M3_H_
+#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/regulator/consumer.h>
#include <media/v4l2-common.h>
@@ -321,6 +322,7 @@ enum s5c73m3_oif_pads {
#define S5C73M3_MAX_SUPPLIES 6
+#define S5C73M3_DEFAULT_MCLK_FREQ 24000000U
struct s5c73m3_ctrls {
struct v4l2_ctrl_handler handler;
@@ -391,6 +393,8 @@ struct s5c73m3 {
struct regulator_bulk_data supplies[S5C73M3_MAX_SUPPLIES];
struct s5c73m3_gpio gpio[GPIO_NUM];
+ struct clk *clock;
+
/* External master clock frequency */
u32 mclk_frequency;
/* Video bus type - MIPI-CSI2/parallel */
--
1.7.9.5
More information about the linux-arm-kernel
mailing list