summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorHans de Goede <hdegoede@redhat.com>2017-08-30 11:48:07 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-08-31 18:23:12 +0200
commit097578ec200858cfa2dd905b08ab8d5576a656e6 (patch)
tree68230104d482671fa071b74cb91a355a3a523670
parent9a8fc4dd36041e017f3ee87a380686c80822b233 (diff)
staging: typec: fusb302: Get max snk mv/ma/mw from device-properties
This is board specific info so it should come from board config, such as devicetree. I've chosen to prefix these with "fcs," treating them as fusb302 driver specific for now. We may want to revisit this and replace these with properties which are part of a (to be written) generic type-c controller devicetree binding. Since this commit adds new dt-properties it also adds devicetree-bindings documentation (which so far was absent for the fusb302 driver). Cc: Rob Herring <robh+dt@kernel.org> Cc: Frank Rowand <frowand.list@gmail.com> Cc: devicetree@vger.kernel.org Cc: "Yueyao (Nathan) Zhu" <yueyao@google.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--Documentation/devicetree/bindings/usb/fcs,fusb302.txt29
-rw-r--r--drivers/staging/typec/fusb302/TODO4
-rw-r--r--drivers/staging/typec/fusb302/fusb302.c18
3 files changed, 50 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/usb/fcs,fusb302.txt b/Documentation/devicetree/bindings/usb/fcs,fusb302.txt
new file mode 100644
index 000000000000..472facfa5a71
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/fcs,fusb302.txt
@@ -0,0 +1,29 @@
+Fairchild FUSB302 Type-C Port controllers
+
+Required properties :
+- compatible : "fcs,fusb302"
+- reg : I2C slave address
+- interrupts : Interrupt specifier
+
+Optional properties :
+- fcs,max-sink-microvolt : Maximum voltage to negotiate when configured as sink
+- fcs,max-sink-microamp : Maximum current to negotiate when configured as sink
+- fcs,max-sink-microwatt : Maximum power to negotiate when configured as sink
+ If this is less then max-sink-microvolt *
+ max-sink-microamp then the configured current will
+ be clamped.
+- fcs,operating-sink-microwatt :
+ Minimum amount of power accepted from a sink
+ when negotiating
+
+Example:
+
+fusb302: typec-portc@54 {
+ compatible = "fcs,fusb302";
+ reg = <0x54>;
+ interrupt-parent = <&nmi_intc>;
+ interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+ fcs,max-sink-microvolt = <12000000>;
+ fcs,max-sink-microamp = <3000000>;
+ fcs,max-sink-microwatt = <36000000>;
+};
diff --git a/drivers/staging/typec/fusb302/TODO b/drivers/staging/typec/fusb302/TODO
index 4933a1d92c32..19b466eb585d 100644
--- a/drivers/staging/typec/fusb302/TODO
+++ b/drivers/staging/typec/fusb302/TODO
@@ -4,3 +4,7 @@ fusb302:
- Find a non-hacky way to coordinate between PM and I2C access
- Documentation? The FUSB302 datasheet provides information on the chip to help
understand the code. But it may still be helpful to have a documentation.
+- We may want to replace the "fcs,max-snk-microvolt", "fcs,max-snk-microamp",
+ "fcs,max-snk-microwatt" and "fcs,operating-snk-microwatt" device(tree)
+ properties with properties which are part of a generic type-c controller
+ devicetree binding.
diff --git a/drivers/staging/typec/fusb302/fusb302.c b/drivers/staging/typec/fusb302/fusb302.c
index 6baed06a3c0d..1c1751c994db 100644
--- a/drivers/staging/typec/fusb302/fusb302.c
+++ b/drivers/staging/typec/fusb302/fusb302.c
@@ -90,6 +90,7 @@ struct fusb302_chip {
struct i2c_client *i2c_client;
struct tcpm_port *tcpm_port;
struct tcpc_dev tcpc_dev;
+ struct tcpc_config tcpc_config;
struct regulator *vbus;
@@ -1198,7 +1199,6 @@ static const struct tcpc_config fusb302_tcpc_config = {
static void init_tcpc_dev(struct tcpc_dev *fusb302_tcpc_dev)
{
- fusb302_tcpc_dev->config = &fusb302_tcpc_config;
fusb302_tcpc_dev->init = tcpm_init;
fusb302_tcpc_dev->get_vbus = tcpm_get_vbus;
fusb302_tcpc_dev->set_cc = tcpm_set_cc;
@@ -1684,7 +1684,9 @@ static int fusb302_probe(struct i2c_client *client,
{
struct fusb302_chip *chip;
struct i2c_adapter *adapter;
+ struct device *dev = &client->dev;
int ret = 0;
+ u32 v;
adapter = to_i2c_adapter(client->dev.parent);
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
@@ -1699,8 +1701,22 @@ static int fusb302_probe(struct i2c_client *client,
chip->i2c_client = client;
i2c_set_clientdata(client, chip);
chip->dev = &client->dev;
+ chip->tcpc_config = fusb302_tcpc_config;
+ chip->tcpc_dev.config = &chip->tcpc_config;
mutex_init(&chip->lock);
+ if (!device_property_read_u32(dev, "fcs,max-sink-microvolt", &v))
+ chip->tcpc_config.max_snk_mv = v / 1000;
+
+ if (!device_property_read_u32(dev, "fcs,max-sink-microamp", &v))
+ chip->tcpc_config.max_snk_ma = v / 1000;
+
+ if (!device_property_read_u32(dev, "fcs,max-sink-microwatt", &v))
+ chip->tcpc_config.max_snk_mw = v / 1000;
+
+ if (!device_property_read_u32(dev, "fcs,operating-sink-microwatt", &v))
+ chip->tcpc_config.operating_snk_mw = v / 1000;
+
ret = fusb302_debugfs_init(chip);
if (ret < 0)
return ret;