[PATCH v2 0/2] media: ov7670: Implement mbus configuration

[PATCH v2 0/2] media: ov7670: Implement mbus configuration

[Jacopo Mondi]

Hello,
   this series adds mbus configuration properties to ov7670 sensor driver.

I have sent v1 a few days ago and forgot to cc device tree people. Doing it
now with bindings description and implementation split in 2 separate patches.

I have fixed Sakari's comment on v1, and I'm sending v2 out with support for
"pll-bypass" custom property as it was in v1. If we decide it is not worth
to make an OF property out of it, I will drop it in v3. Technically it is not
even an mbus configuration option, so I'm fine dropping it eventually.

Thanks
  j

v1->v2:
- Split bindings description and implementation
- Addressed Sakari's comments on v1
- Check for return values of register writes in set_fmt()
- TODO: decide if "pll-bypass" should be an OF property.

Jacopo Mondi (2):
  v4l2: i2c: ov7670: Implement OF mbus configuration
  media: dt-bindings: Add OF properties to ov7670

 .../devicetree/bindings/media/i2c/ov7670.txt       |  14 +++
 drivers/media/i2c/ov7670.c                         | 124 ++++++++++++++++++---
 2 files changed, 124 insertions(+), 14 deletions(-)

--
2.7.4

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[PATCH v2 1/2] v4l2: i2c: ov7670: Implement OF mbus configuration

[Jacopo Mondi]

ov7670 driver supports two optional properties supplied through platform
data, but currently does not support any standard video interface
property.

Add support through OF parsing for 2 generic properties (vsync and hsync
polarities) and for two custom properties already supported by platform
data.

While at there, check return value of register writes in set_fmt
function and rationalize spacings.

Signal polarities and pixel clock blanking verified through scope and
image capture.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 drivers/media/i2c/ov7670.c | 124 ++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 110 insertions(+), 14 deletions(-)

diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
index 950a0ac..d40a601 100644
--- a/drivers/media/i2c/ov7670.c
+++ b/drivers/media/i2c/ov7670.c
@@ -21,6 +21,7 @@
 #include <linux/gpio/consumer.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ctrls.h>
+#include <media/v4l2-fwnode.h>
 #include <media/v4l2-mediabus.h>
 #include <media/v4l2-image-sizes.h>
 #include <media/i2c/ov7670.h>
@@ -237,6 +238,7 @@ struct ov7670_info {
 	struct clk *clk;
 	struct gpio_desc *resetb_gpio;
 	struct gpio_desc *pwdn_gpio;
+	unsigned int mbus_config;	/* Media bus configuration flags */
 	int min_width;			/* Filter out smaller sizes */
 	int min_height;			/* Filter out smaller sizes */
 	int clock_speed;		/* External clock speed (MHz) */
@@ -995,7 +997,7 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
 	struct v4l2_mbus_framefmt *mbus_fmt;
 #endif
-	unsigned char com7;
+	unsigned char com7, com10 = 0;
 	int ret;
 
 	if (format->pad)
@@ -1015,7 +1017,6 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
 	}
 
 	ret = ov7670_try_fmt_internal(sd, &format->format, &ovfmt, &wsize);
-
 	if (ret)
 		return ret;
 	/*
@@ -1026,16 +1027,41 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
 	 */
 	com7 = ovfmt->regs[0].value;
 	com7 |= wsize->com7_bit;
-	ov7670_write(sd, REG_COM7, com7);
+	ret = ov7670_write(sd, REG_COM7, com7);
+	if (ret)
+		return ret;
+
+	/*
+	 * Configure the media bus through COM10 register
+	 */
+	if (info->mbus_config & V4L2_MBUS_VSYNC_ACTIVE_LOW)
+		com10 |= COM10_VS_NEG;
+	if (info->mbus_config & V4L2_MBUS_HSYNC_ACTIVE_LOW)
+		com10 |= COM10_HREF_REV;
+	if (info->pclk_hb_disable)
+		com10 |= COM10_PCLK_HB;
+	ret = ov7670_write(sd, REG_COM10, com10);
+	if (ret)
+		return ret;
+
 	/*
 	 * Now write the rest of the array.  Also store start/stops
 	 */
-	ov7670_write_array(sd, ovfmt->regs + 1);
-	ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
-			wsize->vstop);
-	ret = 0;
-	if (wsize->regs)
+	ret = ov7670_write_array(sd, ovfmt->regs + 1);
+	if (ret)
+		return ret;
+
+	ret = ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
+			    wsize->vstop);
+	if (ret)
+		return ret;
+
+	if (wsize->regs) {
 		ret = ov7670_write_array(sd, wsize->regs);
+		if (ret)
+			return ret;
+	}
+
 	info->fmt = ovfmt;
 
 	/*
@@ -1048,8 +1074,10 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
 	 * to write it unconditionally, and that will make the frame
 	 * rate persistent too.
 	 */
-	if (ret == 0)
-		ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
+	ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
@@ -1658,6 +1686,71 @@ static int ov7670_init_gpio(struct i2c_client *client, struct ov7670_info *info)
 	return 0;
 }
 
+/*
+ * ov7670_parse_dt() - Parse device tree to collect mbus configuration
+ *			properties
+ */
+static int ov7670_parse_dt(struct device *dev,
+			   struct ov7670_info *info)
+{
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+	struct v4l2_fwnode_endpoint bus_cfg;
+	struct fwnode_handle *ep;
+	u32 propval;
+	int ret;
+
+	if (!fwnode)
+		return -EINVAL;
+
+	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
+	if (!ep)
+		return -EINVAL;
+
+	ret = v4l2_fwnode_endpoint_parse(ep, &bus_cfg);
+	if (ret) {
+		fwnode_handle_put(fwnode);
+		return ret;
+	}
+
+	/* Any CSI-2 property set? */
+	if (bus_cfg.bus_type != V4L2_MBUS_PARALLEL) {
+		fwnode_handle_put(fwnode);
+		return -EINVAL;
+	}
+	info->mbus_config = bus_cfg.bus.parallel.flags;
+	fwnode_handle_put(fwnode);
+
+	/* Parse custom OF properties. */
+	info->pclk_hb_disable = false;
+	info->pll_bypass = false;
+
+	ret = fwnode_property_read_u32(ep, "ov7670,pclk-hb-disable", &propval);
+	if (ret < 0 && ret != -EINVAL) {
+		dev_err(dev,
+			"Unable to parse property \"ov7670,pclk-hb-disable\"\n");
+		fwnode_handle_put(ep);
+		return ret;
+
+	} else if (ret == 0 && propval) {
+		info->pclk_hb_disable = true;
+	}
+
+	ret = fwnode_property_read_u32(ep, "ov7670,pll-bypass", &propval);
+	if (ret < 0 && ret != -EINVAL) {
+		dev_err(dev,
+			"Unable to parse property \"ov7670,pll-bypass\"\n");
+		fwnode_handle_put(ep);
+		return ret;
+
+	} else if (ret == 0 && propval) {
+		info->pll_bypass = true;
+	}
+
+	fwnode_handle_put(ep);
+
+	return 0;
+}
+
 static int ov7670_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
@@ -1678,7 +1771,13 @@ static int ov7670_probe(struct i2c_client *client,
 #endif
 
 	info->clock_speed = 30; /* default: a guess */
-	if (client->dev.platform_data) {
+
+	if (dev_fwnode(&client->dev)) {
+		ret = ov7670_parse_dt(&client->dev, info);
+		if (ret)
+			return ret;
+
+	} else if (client->dev.platform_data) {
 		struct ov7670_config *config = client->dev.platform_data;
 
 		/*
@@ -1745,9 +1844,6 @@ static int ov7670_probe(struct i2c_client *client,
 	tpf.denominator = 30;
 	info->devtype->set_framerate(sd, &tpf);
 
-	if (info->pclk_hb_disable)
-		ov7670_write(sd, REG_COM10, COM10_PCLK_HB);
-
 	v4l2_ctrl_handler_init(&info->hdl, 10);
 	v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
 			V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
-- 
2.7.4

[PATCH v2 2/2] media: dt-bindings: Add OF properties to ov7670

[Jacopo Mondi]

Describe newly introduced OF properties for ov7670 image sensor.
The driver supports two standard properties to configure synchronism
signals polarities and two custom properties already supported as
platform data options by the driver.
---
 Documentation/devicetree/bindings/media/i2c/ov7670.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/i2c/ov7670.txt b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
index 826b656..57ded18 100644
--- a/Documentation/devicetree/bindings/media/i2c/ov7670.txt
+++ b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
@@ -9,11 +9,22 @@ Required Properties:
 - clocks: reference to the xclk input clock.
 - clock-names: should be "xclk".
 
+The following properties, as defined by video interfaces OF bindings
+"Documentation/devicetree/bindings/media/video-interfaces.txt" are supported:
+
+- hsync-active: active state of the HSYNC signal, 0/1 for LOW/HIGH respectively.
+- vsync-active: active state of the VSYNC signal, 0/1 for LOW/HIGH respectively.
+
+Default is high active state for both vsync and hsync signals.
+
 Optional Properties:
 - reset-gpios: reference to the GPIO connected to the resetb pin, if any.
   Active is low.
 - powerdown-gpios: reference to the GPIO connected to the pwdn pin, if any.
   Active is high.
+- ov7670,pll-bypass: set to 1 to bypass PLL for pixel clock generation.
+- ov7670,pclk-hb-disable: set to 1 to suppress pixel clock output signal during
+  horizontal blankings.
 
 The device node must contain one 'port' child node for its digital output
 video port, in accordance with the video interface bindings defined in
@@ -34,6 +45,9 @@ Example:
 			assigned-clocks = <&pck0>;
 			assigned-clock-rates = <25000000>;
 
+			vsync-active = <0>;
+			ov7670,pclk-hb-disable = <1>;
+
 			port {
 				ov7670_0: endpoint {
 					remote-endpoint = <&isi_0>;
-- 
2.7.4

Re: [PATCH v2 2/2] media: dt-bindings: Add OF properties to ov7670

[Rob Herring]

On Thu, Jan 04, 2018 at 10:52:33AM +0100, Jacopo Mondi wrote:
> Describe newly introduced OF properties for ov7670 image sensor.
> The driver supports two standard properties to configure synchronism
> signals polarities and two custom properties already supported as
> platform data options by the driver.

Missing S-o-b.

> ---
>  Documentation/devicetree/bindings/media/i2c/ov7670.txt | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/ov7670.txt b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
> index 826b656..57ded18 100644
> --- a/Documentation/devicetree/bindings/media/i2c/ov7670.txt
> +++ b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
> @@ -9,11 +9,22 @@ Required Properties:
>  - clocks: reference to the xclk input clock.
>  - clock-names: should be "xclk".
>  
> +The following properties, as defined by video interfaces OF bindings
> +"Documentation/devicetree/bindings/media/video-interfaces.txt" are supported:
> +
> +- hsync-active: active state of the HSYNC signal, 0/1 for LOW/HIGH respectively.
> +- vsync-active: active state of the VSYNC signal, 0/1 for LOW/HIGH respectively.

Don't these go in the endpoint? Not sure offhand.

> +
> +Default is high active state for both vsync and hsync signals.
> +
>  Optional Properties:
>  - reset-gpios: reference to the GPIO connected to the resetb pin, if any.
>    Active is low.
>  - powerdown-gpios: reference to the GPIO connected to the pwdn pin, if any.
>    Active is high.
> +- ov7670,pll-bypass: set to 1 to bypass PLL for pixel clock generation.

Boolean instead?

> +- ov7670,pclk-hb-disable: set to 1 to suppress pixel clock output signal during
> +  horizontal blankings.

ditto

>  
>  The device node must contain one 'port' child node for its digital output
>  video port, in accordance with the video interface bindings defined in
> @@ -34,6 +45,9 @@ Example:
>  			assigned-clocks = <&pck0>;
>  			assigned-clock-rates = <25000000>;
>  
> +			vsync-active = <0>;
> +			ov7670,pclk-hb-disable = <1>;
> +
>  			port {
>  				ov7670_0: endpoint {
>  					remote-endpoint = <&isi_0>;
> -- 
> 2.7.4
> 
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Re: [PATCH v2 2/2] media: dt-bindings: Add OF properties to ov7670

[jacopo mondi]

Hi Rob,
   thanks for comments

On Mon, Jan 08, 2018 at 09:35:55PM -0600, Rob Herring wrote:
> On Thu, Jan 04, 2018 at 10:52:33AM +0100, Jacopo Mondi wrote:
> > Describe newly introduced OF properties for ov7670 image sensor.
> > The driver supports two standard properties to configure synchronism
> > signals polarities and two custom properties already supported as
> > platform data options by the driver.
>
> Missing S-o-b.
>

Ups, that was trivial, sorry about that

> > ---
> >  Documentation/devicetree/bindings/media/i2c/ov7670.txt | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ov7670.txt b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
> > index 826b656..57ded18 100644
> > --- a/Documentation/devicetree/bindings/media/i2c/ov7670.txt
> > +++ b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
> > @@ -9,11 +9,22 @@ Required Properties:
> >  - clocks: reference to the xclk input clock.
> >  - clock-names: should be "xclk".
> >
> > +The following properties, as defined by video interfaces OF bindings
> > +"Documentation/devicetree/bindings/media/video-interfaces.txt" are supported:
> > +
> > +- hsync-active: active state of the HSYNC signal, 0/1 for LOW/HIGH respectively.
> > +- vsync-active: active state of the VSYNC signal, 0/1 for LOW/HIGH respectively.
>
> Don't these go in the endpoint? Not sure offhand.
>

Yes they do. I will list them as "Optional endpoint properties", and

> > +
> > +Default is high active state for both vsync and hsync signals.
> > +
> >  Optional Properties:
> >  - reset-gpios: reference to the GPIO connected to the resetb pin, if any.
> >    Active is low.
> >  - powerdown-gpios: reference to the GPIO connected to the pwdn pin, if any.
> >    Active is high.
> > +- ov7670,pll-bypass: set to 1 to bypass PLL for pixel clock generation.
>
> Boolean instead?
>

Do we have booleans? I had a look at device tree specs and grep for
"true"/"false" in arch/arm*/boot/dts, and didn't find that much.
Seems like they're actually strings, am I wrong?

Thanks
   j

> > +- ov7670,pclk-hb-disable: set to 1 to suppress pixel clock output signal during
> > +  horizontal blankings.
>
> ditto
>
> >
> >  The device node must contain one 'port' child node for its digital output
> >  video port, in accordance with the video interface bindings defined in
> > @@ -34,6 +45,9 @@ Example:
> >  			assigned-clocks = <&pck0>;
> >  			assigned-clock-rates = <25000000>;
> >
> > +			vsync-active = <0>;
> > +			ov7670,pclk-hb-disable = <1>;
> > +
> >  			port {
> >  				ov7670_0: endpoint {
> >  					remote-endpoint = <&isi_0>;
> > --
> > 2.7.4
> >

Re: [PATCH v2 2/2] media: dt-bindings: Add OF properties to ov7670

[Rob Herring]

On Tue, Jan 9, 2018 at 2:01 AM, jacopo mondi <jacopo-AW8dsiIh9cEdnm+yROfE0A@public.gmane.org> wrote:
> Hi Rob,
>    thanks for comments
>
> On Mon, Jan 08, 2018 at 09:35:55PM -0600, Rob Herring wrote:
>> On Thu, Jan 04, 2018 at 10:52:33AM +0100, Jacopo Mondi wrote:
>> > Describe newly introduced OF properties for ov7670 image sensor.
>> > The driver supports two standard properties to configure synchronism
>> > signals polarities and two custom properties already supported as
>> > platform data options by the driver.
>>
>> Missing S-o-b.
>>
>
> Ups, that was trivial, sorry about that
>
>> > ---
>> >  Documentation/devicetree/bindings/media/i2c/ov7670.txt | 14 ++++++++++++++
>> >  1 file changed, 14 insertions(+)
>> >
>> > diff --git a/Documentation/devicetree/bindings/media/i2c/ov7670.txt b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
>> > index 826b656..57ded18 100644
>> > --- a/Documentation/devicetree/bindings/media/i2c/ov7670.txt
>> > +++ b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
>> > @@ -9,11 +9,22 @@ Required Properties:
>> >  - clocks: reference to the xclk input clock.
>> >  - clock-names: should be "xclk".
>> >
>> > +The following properties, as defined by video interfaces OF bindings
>> > +"Documentation/devicetree/bindings/media/video-interfaces.txt" are supported:
>> > +
>> > +- hsync-active: active state of the HSYNC signal, 0/1 for LOW/HIGH respectively.
>> > +- vsync-active: active state of the VSYNC signal, 0/1 for LOW/HIGH respectively.
>>
>> Don't these go in the endpoint? Not sure offhand.
>>
>
> Yes they do. I will list them as "Optional endpoint properties", and
>
>> > +
>> > +Default is high active state for both vsync and hsync signals.
>> > +
>> >  Optional Properties:
>> >  - reset-gpios: reference to the GPIO connected to the resetb pin, if any.
>> >    Active is low.
>> >  - powerdown-gpios: reference to the GPIO connected to the pwdn pin, if any.
>> >    Active is high.
>> > +- ov7670,pll-bypass: set to 1 to bypass PLL for pixel clock generation.
>>
>> Boolean instead?
>>
>
> Do we have booleans? I had a look at device tree specs and grep for
> "true"/"false" in arch/arm*/boot/dts, and didn't find that much.
> Seems like they're actually strings, am I wrong?

Properties with no value are boolean. Present is true, absent is
false. "foo = <0>" is also treated as true, but not recommended.

Rob
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Re: [PATCH v2 2/2] media: dt-bindings: Add OF properties to ov7670

[Sakari Ailus]

Hi Jacopo,

On Thu, Jan 04, 2018 at 10:52:33AM +0100, Jacopo Mondi wrote:
> Describe newly introduced OF properties for ov7670 image sensor.
> The driver supports two standard properties to configure synchronism
> signals polarities and two custom properties already supported as
> platform data options by the driver.
> ---
>  Documentation/devicetree/bindings/media/i2c/ov7670.txt | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/ov7670.txt b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
> index 826b656..57ded18 100644
> --- a/Documentation/devicetree/bindings/media/i2c/ov7670.txt
> +++ b/Documentation/devicetree/bindings/media/i2c/ov7670.txt
> @@ -9,11 +9,22 @@ Required Properties:
>  - clocks: reference to the xclk input clock.
>  - clock-names: should be "xclk".
>  
> +The following properties, as defined by video interfaces OF bindings
> +"Documentation/devicetree/bindings/media/video-interfaces.txt" are supported:
> +
> +- hsync-active: active state of the HSYNC signal, 0/1 for LOW/HIGH respectively.
> +- vsync-active: active state of the VSYNC signal, 0/1 for LOW/HIGH respectively.

Shouldn't these be mandatory?

If you make them optional, the V4L2 fwnode functions will give you Bt.656
as nothing tells that the signals are there --- which is probably not what
you want. The sensor also supports that, though, if you wish to add support
for it later on.

> +
> +Default is high active state for both vsync and hsync signals.
> +
>  Optional Properties:
>  - reset-gpios: reference to the GPIO connected to the resetb pin, if any.
>    Active is low.
>  - powerdown-gpios: reference to the GPIO connected to the pwdn pin, if any.
>    Active is high.
> +- ov7670,pll-bypass: set to 1 to bypass PLL for pixel clock generation.
> +- ov7670,pclk-hb-disable: set to 1 to suppress pixel clock output signal during
> +  horizontal blankings.
>  
>  The device node must contain one 'port' child node for its digital output
>  video port, in accordance with the video interface bindings defined in
> @@ -34,6 +45,9 @@ Example:
>  			assigned-clocks = <&pck0>;
>  			assigned-clock-rates = <25000000>;
>  
> +			vsync-active = <0>;
> +			ov7670,pclk-hb-disable = <1>;
> +
>  			port {
>  				ov7670_0: endpoint {
>  					remote-endpoint = <&isi_0>;
> -- 
> 2.7.4
> 

-- 
Sakari Ailus
e-mail: sakari.ailus@iki.fi

Re: [PATCH v2 0/2] media: ov7670: Implement mbus configuration

[Sakari Ailus]

Hi Jacopo,

On Thu, Jan 04, 2018 at 10:52:31AM +0100, Jacopo Mondi wrote:
> Hello,
>    this series adds mbus configuration properties to ov7670 sensor driver.
> 
> I have sent v1 a few days ago and forgot to cc device tree people. Doing it
> now with bindings description and implementation split in 2 separate patches.
> 
> I have fixed Sakari's comment on v1, and I'm sending v2 out with support for
> "pll-bypass" custom property as it was in v1. If we decide it is not worth
> to make an OF property out of it, I will drop it in v3. Technically it is not
> even an mbus configuration option, so I'm fine dropping it eventually.
> 
> Thanks
>   j
> 
> v1->v2:
> - Split bindings description and implementation
> - Addressed Sakari's comments on v1
> - Check for return values of register writes in set_fmt()
> - TODO: decide if "pll-bypass" should be an OF property.

The register lists in the sensor driver likely assume certain external clock
frequency, and the pll-bypass bit can be used to avoid dividing this
frequency by four.

As the driver should be aware of the actual clock frequency as well as the
desired clock frequency, it should be possible for the driver to determine
whether to divide the external clock frequency by four or not.

> 
> Jacopo Mondi (2):
>   v4l2: i2c: ov7670: Implement OF mbus configuration
>   media: dt-bindings: Add OF properties to ov7670
> 
>  .../devicetree/bindings/media/i2c/ov7670.txt       |  14 +++
>  drivers/media/i2c/ov7670.c                         | 124 ++++++++++++++++++---
>  2 files changed, 124 insertions(+), 14 deletions(-)
> 
> --
> 2.7.4
> 

-- 
Sakari Ailus
e-mail: sakari.ailus@iki.fi