Re: [PATCH v3 5/5] drm: adv7511: Add support for i2c_new_secondary_device

[Laurent Pinchart]

Hi Kieran,

Thank you for the patch.

On Tuesday, 13 February 2018 00:07:53 EET Kieran Bingham wrote:
> From: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> 
> The ADV7511 has four 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.
> 
> Allow a device tree node to override the default addresses so that
> address conflicts with other devices on the same bus may be resolved at
> the board description level.
> 
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> ---
> v2:
>  - Update missing edid-i2c address setting
>  - Split out DT bindings
>  - Rename and move the I2C default addresses to their own section
> 
>  drivers/gpu/drm/bridge/adv7511/adv7511.h     |  6 ++++
>  drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 42 ++++++++++++++++--------
>  2 files changed, 33 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511.h
> b/drivers/gpu/drm/bridge/adv7511/adv7511.h index d034b2cb5eee..04e6759ee45b
> 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511.h
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511.h
> @@ -93,6 +93,11 @@
>  #define ADV7511_REG_CHIP_ID_HIGH		0xf5
>  #define ADV7511_REG_CHIP_ID_LOW			0xf6
> 
> +/* Hardware defined default addresses for i2c register maps */

s/i2c/I2C/ ? That's really because I had to find something :-)

Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

> +#define ADV7511_CEC_I2C_ADDR_DEFAULT		0x3c
> +#define ADV7511_EDID_I2C_ADDR_DEFAULT		0x3f
> +#define ADV7511_PACKET_I2C_ADDR_DEFAULT		0x38
> +
>  #define ADV7511_CSC_ENABLE			BIT(7)
>  #define ADV7511_CSC_UPDATE_MODE			BIT(5)
> 
> @@ -322,6 +327,7 @@ struct adv7511 {
>  	struct i2c_client *i2c_main;
>  	struct i2c_client *i2c_edid;
>  	struct i2c_client *i2c_cec;
> +	struct i2c_client *i2c_packet;
> 
>  	struct regmap *regmap;
>  	struct regmap *regmap_cec;
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c index
> efa29db5fc2b..5e61b928c9c0 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> @@ -586,7 +586,7 @@ static int adv7511_get_modes(struct adv7511 *adv7511,
>  	/* Reading the EDID only works if the device is powered */
>  	if (!adv7511->powered) {
>  		unsigned int edid_i2c_addr =
> -					(adv7511->i2c_main->addr << 1) + 4;
> +					(adv7511->i2c_edid->addr << 1);
> 
>  		__adv7511_power_on(adv7511);
> 
> @@ -969,10 +969,10 @@ static int adv7511_init_cec_regmap(struct adv7511
> *adv) {
>  	int ret;
> 
> -	adv->i2c_cec = i2c_new_dummy(adv->i2c_main->adapter,
> -				     adv->i2c_main->addr - 1);
> +	adv->i2c_cec = i2c_new_secondary_device(adv->i2c_main, "cec",
> +					ADV7511_CEC_I2C_ADDR_DEFAULT);
>  	if (!adv->i2c_cec)
> -		return -ENOMEM;
> +		return -EINVAL;
>  	i2c_set_clientdata(adv->i2c_cec, adv);
> 
>  	adv->regmap_cec = devm_regmap_init_i2c(adv->i2c_cec,
> @@ -1082,8 +1082,6 @@ static int adv7511_probe(struct i2c_client *i2c, const
> struct i2c_device_id *id) struct adv7511_link_config link_config;
>  	struct adv7511 *adv7511;
>  	struct device *dev = &i2c->dev;
> -	unsigned int main_i2c_addr = i2c->addr << 1;
> -	unsigned int edid_i2c_addr = main_i2c_addr + 4;
>  	unsigned int val;
>  	int ret;
> 
> @@ -1153,24 +1151,35 @@ static int adv7511_probe(struct i2c_client *i2c,
> const struct i2c_device_id *id) if (ret)
>  		goto uninit_regulators;
> 
> -	regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR, edid_i2c_addr);
> -	regmap_write(adv7511->regmap, ADV7511_REG_PACKET_I2C_ADDR,
> -		     main_i2c_addr - 0xa);
> -	regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR,
> -		     main_i2c_addr - 2);
> -
>  	adv7511_packet_disable(adv7511, 0xffff);
> 
> -	adv7511->i2c_edid = i2c_new_dummy(i2c->adapter, edid_i2c_addr >> 1);
> +	adv7511->i2c_edid = i2c_new_secondary_device(i2c, "edid",
> +					ADV7511_EDID_I2C_ADDR_DEFAULT);
>  	if (!adv7511->i2c_edid) {
> -		ret = -ENOMEM;
> +		ret = -EINVAL;
>  		goto uninit_regulators;
>  	}
> 
> +	regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR,
> +		     adv7511->i2c_edid->addr << 1);
> +
>  	ret = adv7511_init_cec_regmap(adv7511);
>  	if (ret)
>  		goto err_i2c_unregister_edid;
> 
> +	regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR,
> +		     adv7511->i2c_cec->addr << 1);
> +
> +	adv7511->i2c_packet = i2c_new_secondary_device(i2c, "packet",
> +					ADV7511_PACKET_I2C_ADDR_DEFAULT);
> +	if (!adv7511->i2c_packet) {
> +		ret = -EINVAL;
> +		goto err_unregister_cec;
> +	}
> +
> +	regmap_write(adv7511->regmap, ADV7511_REG_PACKET_I2C_ADDR,
> +		     adv7511->i2c_packet->addr << 1);
> +
>  	INIT_WORK(&adv7511->hpd_work, adv7511_hpd_work);
> 
>  	if (i2c->irq) {
> @@ -1181,7 +1190,7 @@ static int adv7511_probe(struct i2c_client *i2c, const
> struct i2c_device_id *id) IRQF_ONESHOT, dev_name(dev),
>  						adv7511);
>  		if (ret)
> -			goto err_unregister_cec;
> +			goto err_unregister_packet;
>  	}
> 
>  	adv7511_power_off(adv7511);
> @@ -1203,6 +1212,8 @@ static int adv7511_probe(struct i2c_client *i2c, const
> struct i2c_device_id *id) adv7511_audio_init(dev, adv7511);
>  	return 0;
> 
> +err_unregister_packet:
> +	i2c_unregister_device(adv7511->i2c_packet);
>  err_unregister_cec:
>  	i2c_unregister_device(adv7511->i2c_cec);
>  	if (adv7511->cec_clk)
> @@ -1234,6 +1245,7 @@ static int adv7511_remove(struct i2c_client *i2c)
>  	cec_unregister_adapter(adv7511->cec_adap);
> 
>  	i2c_unregister_device(adv7511->i2c_edid);
> +	i2c_unregister_device(adv7511->i2c_packet);
> 
>  	return 0;
>  }

-- 
Regards,

Laurent Pinchart