linux-kernel - [PATCH v2] usb: typec: get the vbus source and charge values from the devicetree

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Date:   Sun,  9 Sep 2018 12:05:31 -0600
From:   "Angus Ainslie (Purism)" <angus@...ea.ca>
To:     groeck7@...il.com
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Angus Ainslie (Purism)" <angus@...ea.ca>
Subject: [PATCH v2] usb: typec: get the vbus source and charge values from the devicetree

If the board is being powered by USB disabling the source and sink
can remove power from the board. Allow the source and sink to be
initallized based on devicetree values.

Changed since V1:

use devicetree values instead of hardcoded initialization.

Signed-off-by: Angus Ainslie (Purism) <angus@...ea.ca>
---
 .../bindings/connector/usb-connector.txt           |  4 ++++
 drivers/usb/typec/tcpm.c                           | 14 +++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt
index 8855bfcfd778..afe851a713c3 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.txt
+++ b/Documentation/devicetree/bindings/connector/usb-connector.txt
@@ -22,6 +22,10 @@ Optional properties for usb-c-connector:
   or Try.SRC, should be "sink" for Try.SNK or "source" for Try.SRC.
 - data-role: should be one of "host", "device", "dual"(DRD) if typec
   connector supports USB data.
+- init-vbus-source: set the initalization value for vbus-source to true.
+  If this property is not present the initial value will be false.
+- init-vbus-charge: set the initalization value for vbus-charge to true.
+  If this property is not present the initial value will be false.
 
 Required properties for usb-c-connector with power delivery support:
 - source-pdos: An array of u32 with each entry providing supported power
diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
index ca7bedb46f7f..7f5d4f209e07 100644
--- a/drivers/usb/typec/tcpm.c
+++ b/drivers/usb/typec/tcpm.c
@@ -2462,9 +2462,7 @@ static int tcpm_init_vbus(struct tcpm_port *port)
 {
 	int ret;
 
-	ret = port->tcpc->set_vbus(port->tcpc, false, false);
-	port->vbus_source = false;
-	port->vbus_charge = false;
+	ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source, port->vbus_charge);
 	return ret;
 }
 
@@ -4266,6 +4264,16 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
 		return -EINVAL;
 	port->port_type = port->typec_caps.type;
 
+	if (fwnode_property_present(fwnode, "init-vbus-source"))
+		port->vbus_source = true;
+	else
+		port->vbus_source = false;
+
+	if (fwnode_property_present(fwnode, "init-vbus-charge"))
+	        port->vbus_charge = true;
+	else
+	        port->vbus_charge = false;
+
 	if (port->port_type == TYPEC_PORT_SNK)
 		goto sink;
 
-- 
2.17.1