Re: [PATCH v4 5/5] drm: adv7511: Add support for i2c_new_secondary_device

[Archit Taneja <architt@xxxxxxxxxxxxxx>]

On Tuesday 13 February 2018 11:18 PM, 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.

Queued to drm-misc-next

> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> v2:
>   - Update missing edid-i2c address setting
>   - Split out DT bindings
>   - Rename and move the I2C default addresses to their own section
>
> v3:
>   - No change
>
> v4:
>   - Change registration order of packet/cec to fix error path and
>     simplify code change.
>   - Collect Laurent's RB tag
>
>   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..73d8ccb97742 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 */
> +#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)
>   
> @@ -321,6 +326,7 @@ enum adv7511_type {
>   struct adv7511 {
>   	struct i2c_client *i2c_main;
>   	struct i2c_client *i2c_edid;
> +	struct i2c_client *i2c_packet;
>   	struct i2c_client *i2c_cec;
>   
>   	struct regmap *regmap;
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> index efa29db5fc2b..802bc433f54a 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;
>   
> @@ -1153,23 +1151,34 @@ 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);
> +
> +	adv7511->i2c_packet = i2c_new_secondary_device(i2c, "packet",
> +					ADV7511_PACKET_I2C_ADDR_DEFAULT);
> +	if (!adv7511->i2c_packet) {
> +		ret = -EINVAL;
> +		goto err_i2c_unregister_edid;
> +	}
> +
> +	regmap_write(adv7511->regmap, ADV7511_REG_PACKET_I2C_ADDR,
> +		     adv7511->i2c_packet->addr << 1);
> +
>   	ret = adv7511_init_cec_regmap(adv7511);
>   	if (ret)
> -		goto err_i2c_unregister_edid;
> +		goto err_i2c_unregister_packet;
> +
> +	regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR,
> +		     adv7511->i2c_cec->addr << 1);
>   
>   	INIT_WORK(&adv7511->hpd_work, adv7511_hpd_work);
>   
> @@ -1207,6 +1216,8 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
>   	i2c_unregister_device(adv7511->i2c_cec);
>   	if (adv7511->cec_clk)
>   		clk_disable_unprepare(adv7511->cec_clk);
> +err_i2c_unregister_packet:
> +	i2c_unregister_device(adv7511->i2c_packet);
>   err_i2c_unregister_edid:
>   	i2c_unregister_device(adv7511->i2c_edid);
>   uninit_regulators:
> @@ -1233,6 +1244,7 @@ static int adv7511_remove(struct i2c_client *i2c)
>   
>   	cec_unregister_adapter(adv7511->cec_adap);
>   
> +	i2c_unregister_device(adv7511->i2c_packet);
>   	i2c_unregister_device(adv7511->i2c_edid);
>   
>   	return 0;