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Date: Wed, 01 Sep 2021 16:14:07 +0000
From: Yassine Oudjana <y.oudjana@...tonmail.com>
To: MyungJoo Ham <myungjoo.ham@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>,
Rob Herring <robh+dt@...nel.org>
Cc: Yassine Oudjana <y.oudjana@...tonmail.com>,
Michael Auchter <michael.auchter@...com>,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH v4 2/3] extcon: usbc-tusb320: Add support for TUSB320L
TUSB320L is a newer chip with additional features, and it has additional steps
in its mode changing sequence:
- Disable CC state machine,
- Write to mode register,
- Wait for 5 ms,
- Re-enable CC state machine.
It also has an additional register that a revision number can be read from.
Add support for the mode changing sequence, and read the revision number during
probe and print it as info.
Signed-off-by: Yassine Oudjana <y.oudjana@...tonmail.com>
---
Changes since v3:
- Remove extra blank line.
Changes since v2:
- Use a separate mode setting function for each of TUSB320 and TUSB320L.
Changes since v1:
- Split first patch into two patches, one adding support for mode setting and reset on TUSB320,
and the other adding support for TUSB320L.
drivers/extcon/extcon-usbc-tusb320.c | 73 +++++++++++++++++++++++++++-
1 file changed, 71 insertions(+), 2 deletions(-)
diff --git a/drivers/extcon/extcon-usbc-tusb320.c b/drivers/extcon/extcon-usbc-tusb320.c
index 1ed1dfe54206..d21398a0379c 100644
--- a/drivers/extcon/extcon-usbc-tusb320.c
+++ b/drivers/extcon/extcon-usbc-tusb320.c
@@ -21,10 +21,13 @@
#define TUSB320_REG9_INTERRUPT_STATUS BIT(4)
#define TUSB320_REGA 0xa
+#define TUSB320L_REGA_DISABLE_TERM BIT(0)
#define TUSB320_REGA_I2C_SOFT_RESET BIT(3)
#define TUSB320_REGA_MODE_SELECT_SHIFT 4
#define TUSB320_REGA_MODE_SELECT_MASK 0x3
+#define TUSB320L_REGA0_REVISION 0xa0
+
enum tusb320_attached_state {
TUSB320_ATTACHED_STATE_NONE,
TUSB320_ATTACHED_STATE_DFP,
@@ -39,9 +42,15 @@ enum tusb320_mode {
TUSB320_MODE_DRP,
};
+enum tusb320_type {
+ TYPE_TUSB320,
+ TYPE_TUSB320L,
+};
+
struct tusb320_priv {
struct device *dev;
struct regmap *regmap;
+ enum tusb320_type type;
struct extcon_dev *edev;
enum tusb320_attached_state state;
@@ -99,12 +108,53 @@ static int tusb320_set_mode(struct tusb320_priv *priv, enum tusb320_mode mode)
return 0;
}
+static int tusb320l_set_mode(struct tusb320_priv *priv, enum tusb320_mode mode)
+{
+ int ret;
+
+ /* Disable CC state machine */
+ ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
+ TUSB320L_REGA_DISABLE_TERM, 1);
+ if (ret) {
+ dev_err(priv->dev,
+ "failed to disable CC state machine: %d\n", ret);
+ return ret;
+ }
+
+ /* Write mode */
+ ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
+ TUSB320_REGA_MODE_SELECT_MASK << TUSB320_REGA_MODE_SELECT_SHIFT,
+ mode << TUSB320_REGA_MODE_SELECT_SHIFT);
+ if (ret) {
+ dev_err(priv->dev, "failed to write mode: %d\n", ret);
+ goto err;
+ }
+
+ msleep(5);
+err:
+ /* Re-enable CC state machine */
+ ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
+ TUSB320L_REGA_DISABLE_TERM, 0);
+ if (ret)
+ dev_err(priv->dev,
+ "failed to re-enable CC state machine: %d\n", ret);
+
+ return ret;
+}
+
static int tusb320_reset(struct tusb320_priv *priv)
{
int ret;
/* Set mode to default (follow PORT pin) */
- ret = tusb320_set_mode(priv, TUSB320_MODE_PORT);
+ switch (priv->type) {
+ case TYPE_TUSB320:
+ ret = tusb320_set_mode(priv, TUSB320_MODE_PORT);
+ break;
+ case TYPE_TUSB320L:
+ ret = tusb320l_set_mode(priv, TUSB320_MODE_PORT);
+ break;
+ }
if (ret && ret != -EBUSY) {
dev_err(priv->dev,
"failed to set mode to PORT: %d\n", ret);
@@ -176,6 +226,8 @@ static int tusb320_extcon_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tusb320_priv *priv;
+ const void *match_data;
+ unsigned int revision;
int ret;
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
@@ -191,12 +243,28 @@ static int tusb320_extcon_probe(struct i2c_client *client,
if (ret)
return ret;
+ match_data = device_get_match_data(&client->dev);
+ if (!match_data)
+ return -EINVAL;
+
+ priv->type = (enum tusb320_type)match_data;
+
priv->edev = devm_extcon_dev_allocate(priv->dev, tusb320_extcon_cable);
if (IS_ERR(priv->edev)) {
dev_err(priv->dev, "failed to allocate extcon device\n");
return PTR_ERR(priv->edev);
}
+ if (priv->type == TYPE_TUSB320L) {
+ ret = regmap_read(priv->regmap, TUSB320L_REGA0_REVISION, &revision);
+
+ if (ret)
+ dev_warn(priv->dev,
+ "failed to read revision register: %d\n", ret);
+ else
+ dev_info(priv->dev, "chip revision %d\n", revision);
+ }
+
ret = devm_extcon_dev_register(priv->dev, priv->edev);
if (ret < 0) {
dev_err(priv->dev, "failed to register extcon device\n");
@@ -231,7 +299,8 @@ static int tusb320_extcon_probe(struct i2c_client *client,
}
static const struct of_device_id tusb320_extcon_dt_match[] = {
- { .compatible = "ti,tusb320", },
+ { .compatible = "ti,tusb320", .data = (void *)TYPE_TUSB320, },
+ { .compatible = "ti,tusb320l", .data = (void *)TYPE_TUSB320L, },
{ }
};
MODULE_DEVICE_TABLE(of, tusb320_extcon_dt_match);
--
2.33.0
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