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Date: Wed, 29 May 2013 05:31:54 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Prabhakar Lad <prabhakar.csengg@...il.com>
Cc: Hans Verkuil <hans.verkuil@...co.com>,
Mauro Carvalho Chehab <mchehab@...hat.com>,
LMML <linux-media@...r.kernel.org>,
DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
LKML <linux-kernel@...r.kernel.org>,
Guennadi Liakhovetski <g.liakhovetski@....de>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Sakari Ailus <sakari.ailus@....fi>,
Grant Likely <grant.likely@...retlab.ca>,
Sascha Hauer <s.hauer@...gutronix.de>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>, Arnd Bergmann <arnd@...db.de>,
devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH] media: i2c: mt9p031: add OF support
Hi Prabhakar,
Thanks for the patch.
On Sunday 26 May 2013 18:38:54 Prabhakar Lad wrote:
> From: Lad, Prabhakar <prabhakar.csengg@...il.com>
>
> add OF support for the mt9p031 sensor driver.
> Alongside this patch sorts the header inclusion alphabetically.
>
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> Cc: Hans Verkuil <hans.verkuil@...co.com>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
> Cc: Guennadi Liakhovetski <g.liakhovetski@....de>
> Cc: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Cc: Sakari Ailus <sakari.ailus@....fi>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Sascha Hauer <s.hauer@...gutronix.de>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Rob Landley <rob@...dley.net>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: devicetree-discuss@...ts.ozlabs.org
> Cc: davinci-linux-open-source@...ux.davincidsp.com
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
And added to my tree with three small changes (please see below).
> ---
> Changes for NON RFC v1:
> 1: added missing call for of_node_put().
>
> Changes for RFC v4 (https://patchwork.kernel.org/patch/2556251/):
> 1: Renamed "gpio-reset" property to "reset-gpios".
> 2: Dropped assigning the driver data from the of node.
>
> Changes for RFC v3(https://patchwork.kernel.org/patch/2515921/):
> 1: Dropped check if gpio-reset is valid.
> 2: Fixed some code nits.
> 3: Included a reference to the V4L2 DT bindings documentation.
>
> Changes for RFC v2 (https://patchwork.kernel.org/patch/2510201/):
> 1: Used '-' instead of '_' for device properties.
> 2: Specified gpio reset pin as phandle in device node.
> 3: Handle platform data properly even if kernel is compiled with
> devicetree support.
> 4: Used dev_* for messages in drivers instead of pr_*.
> 5: Changed compatible property to "aptina,mt9p031" and "aptina,mt9p031m".
> 6: Sorted the header inclusion alphabetically and fixed some minor code
> nits.
>
> RFC v1: https://patchwork.kernel.org/patch/2498791/
>
> .../devicetree/bindings/media/i2c/mt9p031.txt | 40
> ++++++++++++++++++ drivers/media/i2c/mt9p031.c |
> 43 +++++++++++++++++++- 2 files changed, 81 insertions(+), 2 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/media/i2c/mt9p031.txt
>
> diff --git a/Documentation/devicetree/bindings/media/i2c/mt9p031.txt
> b/Documentation/devicetree/bindings/media/i2c/mt9p031.txt new file mode
> 100644
> index 0000000..59d613c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/mt9p031.txt
> @@ -0,0 +1,40 @@
> +* Aptina 1/2.5-Inch 5Mp CMOS Digital Image Sensor
> +
> +The Aptina MT9P031 is a 1/2.5-inch CMOS active pixel digital image sensor
> with +an active array size of 2592H x 1944V. It is programmable through a
> simple +two-wire serial interface.
> +
> +Required Properties :
> +- compatible : value should be either one among the following
> + (a) "aptina,mt9p031" for mt9p031 sensor
> + (b) "aptina,mt9p031m" for mt9p031m sensor
> +
> +- input-clock-frequency : Input clock frequency.
> +
> +- pixel-clock-frequency : Pixel clock frequency.
> +
> +Optional Properties :
> +- reset-gpios: Chip reset GPIO
There's usually no space before a colon in English.
> +For further reading of port node refer
> Documentation/devicetree/bindings/media/video-interfaces.txt.
> +
> +Example:
> +
> + i2c0@...2000 {
> + ...
> + ...
> + mt9p031@5d {
> + compatible = "aptina,mt9p031";
> + reg = <0x5d>;
> + reset-gpios = <&gpio3 30 0>;
> +
> + port {
> + mt9p031_1: endpoint {
> + input-clock-frequency = <6000000>;
> + pixel-clock-frequency = <96000000>;
> + };
> + };
> + };
> + ...
> + };
> diff --git a/drivers/media/i2c/mt9p031.c b/drivers/media/i2c/mt9p031.c
> index bf49899..bb1f993 100644
> --- a/drivers/media/i2c/mt9p031.c
> +++ b/drivers/media/i2c/mt9p031.c
> @@ -16,9 +16,10 @@
> #include <linux/delay.h>
> #include <linux/device.h>
> #include <linux/gpio.h>
> -#include <linux/module.h>
> #include <linux/i2c.h>
> #include <linux/log2.h>
> +#include <linux/module.h>
> +#include <linux/of_gpio.h>
> #include <linux/pm.h>
> #include <linux/regulator/consumer.h>
> #include <linux/slab.h>
> @@ -28,6 +29,7 @@
> #include <media/v4l2-chip-ident.h>
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-device.h>
> +#include <media/v4l2-of.h>
> #include <media/v4l2-subdev.h>
>
> #include "aptina-pll.h"
> @@ -928,10 +930,37 @@ static const struct v4l2_subdev_internal_ops
> mt9p031_subdev_internal_ops = { * Driver initialization and probing
> */
>
> +static struct mt9p031_platform_data *
> +mt9p031_get_pdata(struct i2c_client *client)
> +{
> + struct mt9p031_platform_data *pdata = NULL;
No need to initialize pdata to NULL here.
> + struct device_node *np;
> +
> + if (!IS_ENABLED(CONFIG_OF) || !client->dev.of_node)
> + return client->dev.platform_data;
> +
> + np = v4l2_of_get_next_endpoint(client->dev.of_node, NULL);
> + if (!np)
> + return NULL;
> +
> + pdata = devm_kzalloc(&client->dev, sizeof(struct mt9p031_platform_data),
> + GFP_KERNEL);
The preferred way to use sizeof in the kernel is sizeof(*var) instead of
sizeof(type). I've thus replaced the above line with
pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + goto done;
> +
> + pdata->reset = of_get_named_gpio(client->dev.of_node, "reset-gpios", 0);
> + of_property_read_u32(np, "input-clock-frequency", &pdata->ext_freq);
> + of_property_read_u32(np, "pixel-clock-frequency", &pdata->target_freq);
> +
> +done:
> + of_node_put(np);
> + return pdata;
> +}
> +
> static int mt9p031_probe(struct i2c_client *client,
> const struct i2c_device_id *did)
> {
> - struct mt9p031_platform_data *pdata = client->dev.platform_data;
> + struct mt9p031_platform_data *pdata = mt9p031_get_pdata(client);
> struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
> struct mt9p031 *mt9p031;
> unsigned int i;
> @@ -1070,8 +1099,18 @@ static const struct i2c_device_id mt9p031_id[] = {
> };
> MODULE_DEVICE_TABLE(i2c, mt9p031_id);
>
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id mt9p031_of_match[] = {
> + { .compatible = "aptina,mt9p031", },
> + { .compatible = "aptina,mt9p031m", },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, mt9p031_of_match);
> +#endif
> +
> static struct i2c_driver mt9p031_i2c_driver = {
> .driver = {
> + .of_match_table = of_match_ptr(mt9p031_of_match),
> .name = "mt9p031",
> },
> .probe = mt9p031_probe,
--
Regards,
Laurent Pinchart
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