* [PATCH v7 2/4] media: i2c: imx258: add support for binding via device tree
2021-01-27 17:46 [PATCH v7 1/4] dt-bindings: media: imx258: add bindings for IMX258 sensor Krzysztof Kozlowski
@ 2021-01-27 17:46 ` Krzysztof Kozlowski
2021-01-27 17:46 ` [PATCH v7 3/4] media: i2c: imx258: simplify getting state container Krzysztof Kozlowski
2021-01-27 17:46 ` [PATCH v7 4/4] media: i2c: imx258: get clock from device properties and enable it via runtime PM Krzysztof Kozlowski
2 siblings, 0 replies; 4+ messages in thread
From: Krzysztof Kozlowski @ 2021-01-27 17:46 UTC (permalink / raw)
To: Sakari Ailus, Mauro Carvalho Chehab, Rob Herring,
Krzysztof Kozlowski, linux-media, devicetree, linux-arm-kernel,
linux-kernel
The IMX258 can be used also on embedded designs using device tree so
allow the sensor to bind to a device tree node.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
Changes since v1:
1. None
---
drivers/media/i2c/imx258.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index df62c69a48c0..ba7f29622974 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -1291,11 +1291,18 @@ static const struct acpi_device_id imx258_acpi_ids[] = {
MODULE_DEVICE_TABLE(acpi, imx258_acpi_ids);
#endif
+static const struct of_device_id imx258_dt_ids[] = {
+ { .compatible = "sony,imx258" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx258_dt_ids);
+
static struct i2c_driver imx258_i2c_driver = {
.driver = {
.name = "imx258",
.pm = &imx258_pm_ops,
.acpi_match_table = ACPI_PTR(imx258_acpi_ids),
+ .of_match_table = imx258_dt_ids,
},
.probe_new = imx258_probe,
.remove = imx258_remove,
--
2.25.1
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* [PATCH v7 3/4] media: i2c: imx258: simplify getting state container
2021-01-27 17:46 [PATCH v7 1/4] dt-bindings: media: imx258: add bindings for IMX258 sensor Krzysztof Kozlowski
2021-01-27 17:46 ` [PATCH v7 2/4] media: i2c: imx258: add support for binding via device tree Krzysztof Kozlowski
@ 2021-01-27 17:46 ` Krzysztof Kozlowski
2021-01-27 17:46 ` [PATCH v7 4/4] media: i2c: imx258: get clock from device properties and enable it via runtime PM Krzysztof Kozlowski
2 siblings, 0 replies; 4+ messages in thread
From: Krzysztof Kozlowski @ 2021-01-27 17:46 UTC (permalink / raw)
To: Sakari Ailus, Mauro Carvalho Chehab, Rob Herring,
Krzysztof Kozlowski, linux-media, devicetree, linux-arm-kernel,
linux-kernel
The pointer to 'struct v4l2_subdev' is stored in drvdata via
v4l2_i2c_subdev_init() so there is no point of a dance like:
struct i2c_client *client = to_i2c_client(struct device *dev)
struct v4l2_subdev *sd = i2c_get_clientdata(client);
This allows to remove local variable 'client' and few pointer
dereferences.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
Changes since v3:
1. None
Changes since v2:
1. New patch
---
drivers/media/i2c/imx258.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index ba7f29622974..505981e02cff 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -1018,8 +1018,7 @@ static int imx258_set_stream(struct v4l2_subdev *sd, int enable)
static int __maybe_unused imx258_suspend(struct device *dev)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
struct imx258 *imx258 = to_imx258(sd);
if (imx258->streaming)
@@ -1030,8 +1029,7 @@ static int __maybe_unused imx258_suspend(struct device *dev)
static int __maybe_unused imx258_resume(struct device *dev)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
struct imx258 *imx258 = to_imx258(sd);
int ret;
--
2.25.1
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* [PATCH v7 4/4] media: i2c: imx258: get clock from device properties and enable it via runtime PM
2021-01-27 17:46 [PATCH v7 1/4] dt-bindings: media: imx258: add bindings for IMX258 sensor Krzysztof Kozlowski
2021-01-27 17:46 ` [PATCH v7 2/4] media: i2c: imx258: add support for binding via device tree Krzysztof Kozlowski
2021-01-27 17:46 ` [PATCH v7 3/4] media: i2c: imx258: simplify getting state container Krzysztof Kozlowski
@ 2021-01-27 17:46 ` Krzysztof Kozlowski
2 siblings, 0 replies; 4+ messages in thread
From: Krzysztof Kozlowski @ 2021-01-27 17:46 UTC (permalink / raw)
To: Sakari Ailus, Mauro Carvalho Chehab, Rob Herring,
Krzysztof Kozlowski, linux-media, devicetree, linux-arm-kernel,
linux-kernel
The IMX258 sensor driver checked in device properties for a
clock-frequency property which actually does not mean that the clock is
really running such frequency or is it even enabled.
Get the provided clock and check it frequency. If none is provided,
fall back to old property.
Enable the clock when accessing the IMX258 registers and when streaming
starts with runtime PM.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
Changes since v6:
1. None
Changes since v5:
1. Move clk_get_rate() out of else block.
Changes since v4:
1. Add missing imx258_power_off.
Changes since v3:
1. None
Changes since v2:
1. Do not try to set drvdata, wrap lines.
2. Use dev_dbg.
Changes since v1:
1. Use runtime PM for clock toggling
---
drivers/media/i2c/imx258.c | 69 +++++++++++++++++++++++++++++++++-----
1 file changed, 61 insertions(+), 8 deletions(-)
diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index 505981e02cff..61d74b794582 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -2,6 +2,7 @@
// Copyright (C) 2018 Intel Corporation
#include <linux/acpi.h>
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
@@ -68,6 +69,9 @@
#define REG_CONFIG_MIRROR_FLIP 0x03
#define REG_CONFIG_FLIP_TEST_PATTERN 0x02
+/* Input clock frequency in Hz */
+#define IMX258_INPUT_CLOCK_FREQ 19200000
+
struct imx258_reg {
u16 address;
u8 val;
@@ -610,6 +614,8 @@ struct imx258 {
/* Streaming on/off */
bool streaming;
+
+ struct clk *clk;
};
static inline struct imx258 *to_imx258(struct v4l2_subdev *_sd)
@@ -972,6 +978,29 @@ static int imx258_stop_streaming(struct imx258 *imx258)
return 0;
}
+static int imx258_power_on(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct imx258 *imx258 = to_imx258(sd);
+ int ret;
+
+ ret = clk_prepare_enable(imx258->clk);
+ if (ret)
+ dev_err(dev, "failed to enable clock\n");
+
+ return ret;
+}
+
+static int imx258_power_off(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct imx258 *imx258 = to_imx258(sd);
+
+ clk_disable_unprepare(imx258->clk);
+
+ return 0;
+}
+
static int imx258_set_stream(struct v4l2_subdev *sd, int enable)
{
struct imx258 *imx258 = to_imx258(sd);
@@ -1199,9 +1228,26 @@ static int imx258_probe(struct i2c_client *client)
int ret;
u32 val = 0;
- device_property_read_u32(&client->dev, "clock-frequency", &val);
- if (val != 19200000)
+ imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL);
+ if (!imx258)
+ return -ENOMEM;
+
+ imx258->clk = devm_clk_get_optional(&client->dev, NULL);
+ if (!imx258->clk) {
+ dev_dbg(&client->dev,
+ "no clock provided, using clock-frequency property\n");
+
+ device_property_read_u32(&client->dev, "clock-frequency", &val);
+ if (val != IMX258_INPUT_CLOCK_FREQ)
+ return -EINVAL;
+ } else if (IS_ERR(imx258->clk)) {
+ return dev_err_probe(&client->dev, PTR_ERR(imx258->clk),
+ "error getting clock\n");
+ }
+ if (clk_get_rate(imx258->clk) != IMX258_INPUT_CLOCK_FREQ) {
+ dev_err(&client->dev, "input clock frequency not supported\n");
return -EINVAL;
+ }
/*
* Check that the device is mounted upside down. The driver only
@@ -1211,24 +1257,25 @@ static int imx258_probe(struct i2c_client *client)
if (ret || val != 180)
return -EINVAL;
- imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL);
- if (!imx258)
- return -ENOMEM;
-
/* Initialize subdev */
v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops);
+ /* Will be powered off via pm_runtime_idle */
+ ret = imx258_power_on(&client->dev);
+ if (ret)
+ return ret;
+
/* Check module identity */
ret = imx258_identify_module(imx258);
if (ret)
- return ret;
+ goto error_identify;
/* Set default mode to max resolution */
imx258->cur_mode = &supported_modes[0];
ret = imx258_init_controls(imx258);
if (ret)
- return ret;
+ goto error_identify;
/* Initialize subdev */
imx258->sd.internal_ops = &imx258_internal_ops;
@@ -1258,6 +1305,9 @@ static int imx258_probe(struct i2c_client *client)
error_handler_free:
imx258_free_controls(imx258);
+error_identify:
+ imx258_power_off(&client->dev);
+
return ret;
}
@@ -1271,6 +1321,8 @@ static int imx258_remove(struct i2c_client *client)
imx258_free_controls(imx258);
pm_runtime_disable(&client->dev);
+ if (!pm_runtime_status_suspended(&client->dev))
+ imx258_power_off(&client->dev);
pm_runtime_set_suspended(&client->dev);
return 0;
@@ -1278,6 +1330,7 @@ static int imx258_remove(struct i2c_client *client)
static const struct dev_pm_ops imx258_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(imx258_suspend, imx258_resume)
+ SET_RUNTIME_PM_OPS(imx258_power_off, imx258_power_on, NULL)
};
#ifdef CONFIG_ACPI
--
2.25.1
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