Re: [PATCH] drm/bridge: adv7511: add support for the 2nd chip

[Archit Taneja <architt@codeaurora.org>]

Hi,

On 9/2/2016 2:13 AM, Sergei Shtylyov wrote:
> The Renesas Wheat board has 2 ADV7513 chips on the same I2C bus, however
> the ADV751x driver only supports 1 chip as  it tries to assign the packet/
> EDID/CEC  memory I2C devices  to the fixed I2C addresses. Assign these I2C
> addresses at the fixed offsets (derived from the programming guide) from
> the  main register map address  instead...
>
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
>
> ---
> The patch is against David Airlie's 'linux.git' repo's 'drm-next' branch.
>
>   drivers/gpu/drm/bridge/adv7511/adv7511_drv.c |   12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)
>
> Index: linux/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> ===================================================================
> --- linux.orig/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> +++ linux/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> @@ -922,15 +922,13 @@ static int adv7511_parse_dt(struct devic
>   	return 0;
>   }
>
> -static const int edid_i2c_addr = 0x7e;
> -static const int packet_i2c_addr = 0x70;
> -static const int cec_i2c_addr = 0x78;
> -
>   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;
>
> @@ -991,8 +989,10 @@ static int adv7511_probe(struct i2c_clie
>
>   	regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR, edid_i2c_addr);
>   	regmap_write(adv7511->regmap, ADV7511_REG_PACKET_I2C_ADDR,
> -		     packet_i2c_addr);
> -	regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR, cec_i2c_addr);
> +		     main_i2c_addr - 0xa);
> +	regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR,
> +		     main_i2c_addr - 2);

The adv7533.c part of the driver uses cec_i2c_addr to create a another
dummy i2c device for CEC. Could you update this patch to derive the
cec address from the main i2c address for the ADV7533 part too?

Thanks,
Archit

> +
>   	adv7511_packet_disable(adv7511, 0xffff);
>
>   	adv7511->i2c_main = i2c;
>
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