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Subject: Re: [PATCH v3 5/5] drm: adv7511: Add support for
 i2c_new_secondary_device
To:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc:     linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
        Kieran Bingham <kieran.bingham@ideasonboard.com>,
        Jean-Michel Hautbois <jean-michel.hautbois@vodalys.com>,
        Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
        Archit Taneja <architt@codeaurora.org>,
        Andrzej Hajda <a.hajda@samsung.com>,
        David Airlie <airlied@linux.ie>,
        Hans Verkuil <hverkuil@xs4all.nl>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Bhumika Goyal <bhumirks@gmail.com>,
        Inki Dae <inki.dae@samsung.com>
References: <1518473273-6333-1-git-send-email-kbingham@kernel.org>
 <1518473273-6333-6-git-send-email-kbingham@kernel.org>
 <3664373.zGkbJUDGbo@avalon>
From:   Kieran Bingham <kieran.bingham@ideasonboard.com>
Organization: Ideas on Board
Message-ID: <9db9aec6-5ab3-4a67-d705-19d91667d5dc@ideasonboard.com>
Date:   Tue, 13 Feb 2018 14:23:41 +0000
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Hi Laurent,

Thanks for the review,

On 13/02/18 12:23, Laurent Pinchart wrote:
> 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@ideasonboard.com>
>>
>> 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@ideasonboard.com>
>> ---
>> 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 :-)

The I²C comes from JMH's original patch, but is much harder to grep for, so
normalising to I2C throughout.


> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com
Collected, Thanks,
--
Kieran

> 
>> +#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;
>>  }
>