Re: [PATCH 2/2] drm: adv7511: Add support for i2c_new_secondary_device
From: Archit Taneja
Date: Sun Jan 28 2018 - 23:11:52 EST
Hi,
On 01/22/2018 06:20 PM, Kieran Bingham wrote:
The ADV7511 has four 256-byte maps that can be accessed via the main IÂC
ports. Each map has it own IÂC address and acts as a standard slave
device on the IÂC 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@xxxxxxxxxxxxxxxx>
---
.../bindings/display/bridge/adi,adv7511.txt | 10 +++++-
drivers/gpu/drm/bridge/adv7511/adv7511.h | 4 +++
drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 36 ++++++++++++++--------
3 files changed, 37 insertions(+), 13 deletions(-)
diff --git a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
index 0047b1394c70..f6bb9f6d3f48 100644
--- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
+++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
@@ -70,6 +70,9 @@ Optional properties:
rather than generate its own timings for HDMI output.
- clocks: from common clock binding: reference to the CEC clock.
- clock-names: from common clock binding: must be "cec".
+- reg-names : Names of maps with programmable addresses.
+ It can contain any map needing a non-default address.
+ Possible maps names are : "main", "edid", "cec", "packet"
Required nodes:
@@ -88,7 +91,12 @@ Example
adv7511w: hdmi@39 {
compatible = "adi,adv7511w";
- reg = <39>;
+ /*
+ * The EDID page will be accessible on address 0x66 on the i2c
+ * bus. All other maps continue to use their default addresses.
+ */
+ reg = <0x39 0x66>;
+ reg-names = "main", "edid";
interrupt-parent = <&gpio3>;
interrupts = <29 IRQ_TYPE_EDGE_FALLING>;
clocks = <&cec_clock>;
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511.h b/drivers/gpu/drm/bridge/adv7511/adv7511.h
index d034b2cb5eee..7d81ce3808e0 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511.h
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511.h
@@ -53,8 +53,10 @@
#define ADV7511_REG_POWER 0x41
#define ADV7511_REG_STATUS 0x42
#define ADV7511_REG_EDID_I2C_ADDR 0x43
+#define ADV7511_REG_EDID_I2C_ADDR_DEFAULT 0x3f
#define ADV7511_REG_PACKET_ENABLE1 0x44
#define ADV7511_REG_PACKET_I2C_ADDR 0x45
+#define ADV7511_REG_PACKET_I2C_ADDR_DEFAULT 0x38
#define ADV7511_REG_DSD_ENABLE 0x46
#define ADV7511_REG_VIDEO_INPUT_CFG2 0x48
#define ADV7511_REG_INFOFRAME_UPDATE 0x4a
@@ -89,6 +91,7 @@
#define ADV7511_REG_TMDS_CLOCK_INV 0xde
#define ADV7511_REG_ARC_CTRL 0xdf
#define ADV7511_REG_CEC_I2C_ADDR 0xe1
+#define ADV7511_REG_CEC_I2C_ADDR_DEFAULT 0x3c
Minor comment: The defines above make look like new register
defines. It would be nice to remove the "REG_" from them, and
place them somewhere after the register definitions.
#define ADV7511_REG_CEC_CTRL 0xe2
#define ADV7511_REG_CHIP_ID_HIGH 0xf5
#define ADV7511_REG_CHIP_ID_LOW 0xf6
@@ -322,6 +325,7 @@ 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..7ec33837752b 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -969,8 +969,8 @@ 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);
This patch avoids deriving the CEC/EDID map addresses from the main map. I think this would break
what the original patch tried to do:
d25a4cbba4b9da7c2d674b2f8ecf84af1b24988e
"drm/bridge: adv7511: add support for the 2nd chip"
Maybe the default macros can be a function of the main address?
+ adv->i2c_cec = i2c_new_secondary_device(adv->i2c_main, "cec",
+ ADV7511_REG_CEC_I2C_ADDR_DEFAULT);
Also, I'm a bit unclear on the default address values. For example, previously, the CEC
address was calculated as "adv->i2c_main->addr - 1", which is 0x38. The new CEC_I2C_ADDR_DEFAULT
define sets it to 0x3c.
Thanks,
Archit
if (!adv->i2c_cec)
return -ENOMEM;
i2c_set_clientdata(adv->i2c_cec, adv);
@@ -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_REG_EDID_I2C_ADDR_DEFAULT);
if (!adv7511->i2c_edid) {
ret = -ENOMEM;
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_REG_PACKET_I2C_ADDR_DEFAULT);
+ if (!adv7511->i2c_packet) {
+ ret = -ENOMEM;
+ 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;
}
--
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