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Date: Wed, 25 Apr 2018 12:46:17 +0530
From: Archit Taneja <architt@...eaurora.org>
To: Kieran Bingham <kbingham@...nel.org>, linux-kernel@...r.kernel.org,
linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-renesas-soc@...r.kernel.org
Cc: Kieran Bingham <kieran.bingham@...asonboard.com>,
Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
Lars-Peter Clausen <lars@...afoo.de>,
Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Subject: Re: [PATCH v4 5/5] drm: adv7511: Add support for
i2c_new_secondary_device
On Tuesday 13 February 2018 11:18 PM, Kieran Bingham wrote:
> From: Kieran Bingham <kieran.bingham+renesas@...asonboard.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.
Queued to drm-misc-next
>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> ---
> 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;
>
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