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Date:	Thu, 23 Oct 2014 02:44:14 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
Cc:	linux-media@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	wsa@...-dreams.de, lars@...afoo.de
Subject: Re: [PATCH 2/2] adv7604: Add support for i2c_new_secondary_device

Hi Jean-Michel,

Thank you for the patch.

On Wednesday 22 October 2014 17:30:48 Jean-Michel Hautbois wrote:
> The ADV7604 has thirteen 256-byte maps that can be accessed via the main
> I²C ports. Each map has it own I²C address and acts
> as a standard slave device on the I²C bus.
> 
> If nothing is defined, it uses default addresses.
> The main purpose is using two adv76xx on the same i2c bus.
> 
> Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
> ---
>  .../devicetree/bindings/media/i2c/adv7604.txt      | 16 +++++-
>  drivers/media/i2c/adv7604.c                        | 59 ++++++++++++-------
>  2 files changed, 53 insertions(+), 22 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/adv7604.txt
> b/Documentation/devicetree/bindings/media/i2c/adv7604.txt index
> 5c8b3e6..8486b5c 100644
> --- a/Documentation/devicetree/bindings/media/i2c/adv7604.txt
> +++ b/Documentation/devicetree/bindings/media/i2c/adv7604.txt
> @@ -12,7 +12,10 @@ Required Properties:
>      - "adi,adv7611" for the ADV7611
>      - "adi,adv7604" for the ADV7604

Given that I'll have comment on the independent patch that adds support for 
the adv7604, you should rebase this series to remote that dependency if you 
want to get it merged now, otherwise it will get delayed.

> 
> -  - reg: I2C slave address
> +  - reg: I2C slave addresses
> +    The ADV7604 has thirteen 256-byte maps that can be accessed via the
> main
> +    I²C ports. Each map has it own I²C address and acts
> +    as a standard slave device on the I²C bus.
> 
>    - hpd-gpios: References to the GPIOs that control the HDMI hot-plug
>      detection pins, one per HDMI input. The active flag indicates the GPIO
> @@ -33,6 +36,12 @@ The digital output port node must contain at least one
> endpoint. Optional Properties:
> 
>    - reset-gpios: Reference to the GPIO connected to the device's reset pin.
> +  - reg-names : Names of maps with programmable addresses.
> +		It can contain any map needing another address than default one.
> +		Possible maps names are :
> +ADV7604 : "main", "avlink", "cec", "infoframe", "esdp", "dpp", "afe",
> "rep",
> +		"edid", "hdmi", "test", "cp", "vdp"

If you rebase the series in order to avoid depending on the adv7604 DT support 
patch this line should be moved to "adv7604: Add DT parsing support".

> +ADV7611 : "main", "cec", "infoframe", "afe", "rep", "edid", "hdmi", "cp"
> 
>  Optional Endpoint Properties:
> 
> @@ -51,7 +60,10 @@ Example:
> 
>  	hdmi_receiver@4c {
>  		compatible = "adi,adv7611";
> -		reg = <0x4c>;
> +		/* edid page will be accessible @ 0x66 on i2c bus */
> +		/* other maps keep their default addresses */
> +		reg = <0x4c 0x66>;
> +		reg-names = "main", "edid";
> 
>  		reset-gpios = <&ioexp 0 GPIO_ACTIVE_LOW>;
>  		hpd-gpios = <&ioexp 2 GPIO_ACTIVE_HIGH>;
> diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
> index 421035f..e4e30a2 100644
> --- a/drivers/media/i2c/adv7604.c
> +++ b/drivers/media/i2c/adv7604.c
> @@ -326,6 +326,27 @@ static const struct adv7604_video_standards
> adv7604_prim_mode_hdmi_gr[] = { { },
>  };
> 
> +struct adv7604_register {
> +	const char *name;
> +	u8 default_addr;
> +};
> +
> +static const struct adv7604_register adv7604_secondary_names[] = {
> +	[ADV7604_PAGE_IO] = { "main", 0x4c },
> +	[ADV7604_PAGE_AVLINK] = { "avlink", 0x42 },
> +	[ADV7604_PAGE_CEC] = { "cec", 0x40 },
> +	[ADV7604_PAGE_INFOFRAME] = { "infoframe", 0x3e },
> +	[ADV7604_PAGE_ESDP] = { "esdp", 0x38 },
> +	[ADV7604_PAGE_DPP] = { "dpp", 0x3c },
> +	[ADV7604_PAGE_AFE] = { "afe", 0x26 },
> +	[ADV7604_PAGE_REP] = { "rep", 0x32 },
> +	[ADV7604_PAGE_EDID] = { "edid", 0x36 },
> +	[ADV7604_PAGE_HDMI] = { "hdmi", 0x34 },
> +	[ADV7604_PAGE_TEST] = { "test", 0x30 },
> +	[ADV7604_PAGE_CP] = { "cp", 0x22 },
> +	[ADV7604_PAGE_VDP] = { "vdp", 0x24 },
> +};
> +
>  /* -----------------------------------------------------------------------
> */
> 
>  static inline struct adv7604_state *to_state(struct v4l2_subdev *sd)
> @@ -2528,13 +2549,26 @@ static void adv7604_unregister_clients(struct
> adv7604_state *state) }
> 
>  static struct i2c_client *adv7604_dummy_client(struct v4l2_subdev *sd,
> -							u8 addr, u8 io_reg)
> +						unsigned int i)
>  {
>  	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +	struct adv7604_platform_data *pdata = client->dev.platform_data;
> +	unsigned int io_reg = 0xf2 + i;
> +	unsigned int default_addr = io_read(sd, io_reg) >> 1;

The variable isn't used.

> +	struct i2c_client *new_client;
> +
> +	if (pdata && pdata->i2c_addresses[i])
> +		new_client = i2c_new_dummy(client->adapter,
> +					pdata->i2c_addresses[i]);
> +	else
> +		new_client = i2c_new_secondary_device(client,
> +			adv7604_secondary_names[i].name,
> +			adv7604_secondary_names[i].default_addr);
> +
> +	if (new_client)
> +		io_write(sd, io_reg, new_client->addr << 1);
> 
> -	if (addr)
> -		io_write(sd, io_reg, addr << 1);
> -	return i2c_new_dummy(client->adapter, io_read(sd, io_reg) >> 1);
> +	return new_client;
>  }
> 
>  static const struct adv7604_reg_seq adv7604_recommended_settings_afe[] = {
> @@ -2718,20 +2752,6 @@ static int adv7604_parse_dt(struct adv7604_state
> *state) /* Disable the interrupt for now as no DT-based board uses it. */
> state->pdata.int1_config = ADV7604_INT1_CONFIG_DISABLED;
> 
> -	/* Use the default I2C addresses. */
> -	state->pdata.i2c_addresses[ADV7604_PAGE_AVLINK] = 0x42;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_CEC] = 0x40;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_INFOFRAME] = 0x3e;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_ESDP] = 0x38;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_DPP] = 0x3c;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_AFE] = 0x26;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_REP] = 0x32;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_EDID] = 0x36;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_HDMI] = 0x34;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_TEST] = 0x30;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_CP] = 0x22;
> -	state->pdata.i2c_addresses[ADV7604_PAGE_VDP] = 0x24;
> -
>  	/* Hardcode the remaining platform data fields. */
>  	state->pdata.disable_pwrdnb = 0;
>  	state->pdata.disable_cable_det_rst = 0;
> @@ -2892,8 +2912,7 @@ static int adv7604_probe(struct i2c_client *client,
>  			continue;
> 
>  		state->i2c_clients[i] =
> -			adv7604_dummy_client(sd, state->pdata.i2c_addresses[i],
> -					     0xf2 + i);
> +			adv7604_dummy_client(sd, i);
>  		if (state->i2c_clients[i] == NULL) {
>  			err = -ENOMEM;
>  			v4l2_err(sd, "failed to create i2c client %u\n", i);

-- 
Regards,

Laurent Pinchart

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