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media: ov5675: add device-tree support
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Until now, this driver only supported ACPI. This adds support for
Device Tree too.

This is heavily inspired by device tree support addition to OV8856
driver. The differentiation between ACPI and DT mode is done through an
is_acpi_node check.

Cc: Quentin Schulz <foss+kernel@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
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@QSchulz @intel-lab-lkp
QSchulz authored and intel-lab-lkp committed May 3, 2022
1 parent 016f734 commit 1623110
Showing 1 changed file with 121 additions and 13 deletions.
134 changes: 121 additions & 13 deletions drivers/media/i2c/ov5675.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3,10 +3,13 @@

#include <asm/unaligned.h>
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
Expand All @@ -17,7 +20,7 @@

#define OV5675_LINK_FREQ_450MHZ 450000000ULL
#define OV5675_SCLK 90000000LL
#define OV5675_MCLK 19200000
#define OV5675_XVCLK_19_2 19200000
#define OV5675_DATA_LANES 2
#define OV5675_RGB_DEPTH 10

Expand Down Expand Up @@ -76,6 +79,14 @@

#define to_ov5675(_sd) container_of(_sd, struct ov5675, sd)

static const char * const ov5675_supply_names[] = {
"avdd", /* Analog power */
"dovdd", /* Digital I/O power */
"dvdd", /* Digital core power */
};

#define OV5675_NUM_SUPPLIES ARRAY_SIZE(ov5675_supply_names)

enum {
OV5675_LINK_FREQ_900MBPS,
};
Expand Down Expand Up @@ -484,6 +495,9 @@ struct ov5675 {
struct v4l2_subdev sd;
struct media_pad pad;
struct v4l2_ctrl_handler ctrl_handler;
struct clk *xvclk;
struct gpio_desc *reset_gpio;
struct regulator_bulk_data supplies[OV5675_NUM_SUPPLIES];

/* V4L2 Controls */
struct v4l2_ctrl *link_freq;
Expand Down Expand Up @@ -944,6 +958,52 @@ static int ov5675_set_stream(struct v4l2_subdev *sd, int enable)
return ret;
}

static void __ov5675_power_off(struct ov5675 *ov5675)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);

if (is_acpi_node(dev_fwnode(&client->dev)))
return;

gpiod_set_value_cansleep(ov5675->reset_gpio, 1);
usleep_range(1000, 1200);

regulator_bulk_disable(OV5675_NUM_SUPPLIES, ov5675->supplies);
clk_disable_unprepare(ov5675->xvclk);
}

static int __ov5675_power_on(struct ov5675 *ov5675)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
int ret;

if (is_acpi_node(dev_fwnode(&client->dev)))
return 0;

ret = clk_prepare_enable(ov5675->xvclk);
if (ret < 0) {
dev_err(&client->dev, "failed to enable xvclk: %d\n", ret);
return ret;
}

gpiod_set_value_cansleep(ov5675->reset_gpio, 1);

/* Reset pulse should be at least 2ms */
usleep_range(2000, 2200);

ret = regulator_bulk_enable(OV5675_NUM_SUPPLIES, ov5675->supplies);
if (ret) {
clk_disable_unprepare(ov5675->xvclk);
return ret;
}

gpiod_set_value_cansleep(ov5675->reset_gpio, 0);

usleep_range(1000, 1200);

return 0;
}

static int __maybe_unused ov5675_suspend(struct device *dev)
{
struct v4l2_subdev *sd = dev_get_drvdata(dev);
Expand All @@ -953,6 +1013,7 @@ static int __maybe_unused ov5675_suspend(struct device *dev)
if (ov5675->streaming)
ov5675_stop_streaming(ov5675);

__ov5675_power_off(ov5675);
mutex_unlock(&ov5675->mutex);

return 0;
Expand All @@ -965,6 +1026,8 @@ static int __maybe_unused ov5675_resume(struct device *dev)
int ret;

mutex_lock(&ov5675->mutex);

__ov5675_power_on(ov5675);
if (ov5675->streaming) {
ret = ov5675_start_streaming(ov5675);
if (ret) {
Expand Down Expand Up @@ -1106,32 +1169,60 @@ static const struct v4l2_subdev_internal_ops ov5675_internal_ops = {
.open = ov5675_open,
};

static int ov5675_check_hwcfg(struct device *dev)
static int ov5675_get_hwcfg(struct ov5675 *ov5675, struct device *dev)
{
struct fwnode_handle *ep;
struct fwnode_handle *fwnode = dev_fwnode(dev);
struct v4l2_fwnode_endpoint bus_cfg = {
.bus_type = V4L2_MBUS_CSI2_DPHY
};
u32 mclk;
u32 xvclk_rate;
int ret;
unsigned int i, j;

if (!fwnode)
return -ENXIO;

ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
ret = fwnode_property_read_u32(fwnode, "clock-frequency", &xvclk_rate);

if (ret) {
dev_err(dev, "can't get clock frequency");
return ret;
}

if (mclk != OV5675_MCLK) {
dev_err(dev, "external clock %d is not supported", mclk);
if (!is_acpi_node(fwnode)) {
ov5675->xvclk = devm_clk_get(dev, "xvclk");
if (IS_ERR(ov5675->xvclk)) {
ret = PTR_ERR(ov5675->xvclk);
dev_err(dev, "failed to get xvclk: %d\n", ret);
return ret;
}

clk_set_rate(ov5675->xvclk, xvclk_rate);
xvclk_rate = clk_get_rate(ov5675->xvclk);
}

if (xvclk_rate != OV5675_XVCLK_19_2) {
dev_err(dev, "external clock rate %u is unsupported", xvclk_rate);
return -EINVAL;
}

ov5675->reset_gpio = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(ov5675->reset_gpio)) {
ret = PTR_ERR(ov5675->reset_gpio);
dev_err(dev, "failed to get reset-gpios: %d\n", ret);
return ret;
}

for (i = 0; i < OV5675_NUM_SUPPLIES; i++)
ov5675->supplies[i].supply = ov5675_supply_names[i];

ret = devm_regulator_bulk_get(dev, OV5675_NUM_SUPPLIES,
ov5675->supplies);
if (ret)
return ret;

ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
if (!ep)
return -ENXIO;
Expand Down Expand Up @@ -1186,6 +1277,8 @@ static int ov5675_remove(struct i2c_client *client)
pm_runtime_disable(&client->dev);
mutex_destroy(&ov5675->mutex);

__ov5675_power_off(ov5675);

return 0;
}

Expand All @@ -1195,25 +1288,31 @@ static int ov5675_probe(struct i2c_client *client)
bool full_power;
int ret;

ret = ov5675_check_hwcfg(&client->dev);
ov5675 = devm_kzalloc(&client->dev, sizeof(*ov5675), GFP_KERNEL);
if (!ov5675)
return -ENOMEM;

ret = ov5675_get_hwcfg(ov5675, &client->dev);
if (ret) {
dev_err(&client->dev, "failed to check HW configuration: %d",
dev_err(&client->dev, "failed to get HW configuration: %d",
ret);
return ret;
}

ov5675 = devm_kzalloc(&client->dev, sizeof(*ov5675), GFP_KERNEL);
if (!ov5675)
return -ENOMEM;

v4l2_i2c_subdev_init(&ov5675->sd, client, &ov5675_subdev_ops);

ret = __ov5675_power_on(ov5675);
if (ret) {
dev_err(&client->dev, "failed to power on: %d\n", ret);
return ret;
}

full_power = acpi_dev_state_d0(&client->dev);
if (full_power) {
ret = ov5675_identify_module(ov5675);
if (ret) {
dev_err(&client->dev, "failed to find sensor: %d", ret);
return ret;
goto probe_power_off;
}
}

Expand Down Expand Up @@ -1262,6 +1361,8 @@ static int ov5675_probe(struct i2c_client *client)
probe_error_v4l2_ctrl_handler_free:
v4l2_ctrl_handler_free(ov5675->sd.ctrl_handler);
mutex_destroy(&ov5675->mutex);
probe_power_off:
__ov5675_power_off(ov5675);

return ret;
}
Expand All @@ -1279,11 +1380,18 @@ static const struct acpi_device_id ov5675_acpi_ids[] = {
MODULE_DEVICE_TABLE(acpi, ov5675_acpi_ids);
#endif

static const struct of_device_id ov5675_of_match[] = {
{ .compatible = "ovti,ov5675", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ov5675_of_match);

static struct i2c_driver ov5675_i2c_driver = {
.driver = {
.name = "ov5675",
.pm = &ov5675_pm_ops,
.acpi_match_table = ACPI_PTR(ov5675_acpi_ids),
.of_match_table = of_match_ptr(ov5675_of_match),
},
.probe_new = ov5675_probe,
.remove = ov5675_remove,
Expand Down

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