[PATCH 0/2] usb: typec: tcpm: Handle Accessory Modes

[PATCH 0/2] usb: typec: tcpm: Handle Accessory Modes

[Dmitry Baryshkov]

In addition to Alternative Modes (see [1]), some of the TCPM-backed
boards (e.g. Qualcomm SM8150-HDK) can support USB-C Accessory Modes
(e.g. the Analog Audio). Add bindings and driver support for parsing
this kind of information.

Note, while it might make sense to put accessory-mode-audio and -debug
handling to typec_get_fw_cap(), I decided against it. Several existing
drivers use this function, while providing AccMode caps based on some
internal logic.

[1] https://lore.kernel.org/linux-usb/20231120224919.2293730-1-dmitry.baryshkov@linaro.org/

Dmitry Baryshkov (2):
  dt-bindings: connector: usb: add accessory mode description
  usb: typec: tcpm: Parse Accessory Mode information

 .../devicetree/bindings/connector/usb-connector.yaml | 12 ++++++++++++
 drivers/usb/typec/tcpm/tcpm.c                        |  7 +++++++
 2 files changed, 19 insertions(+)

-- 
2.42.0

[PATCH 1/2] dt-bindings: connector: usb: add accessory mode description

[Dmitry Baryshkov]

Add description of the USB-C Accessory Modes supported on the particular
USB-C connector. This is required for devices like Qualcomm SM8150-HDK,
which have no other way to express accessory modes supported by the
hardware platform.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 .../devicetree/bindings/connector/usb-connector.yaml | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
index c1aaac861d9d..b4f96ef85fb0 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
+++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
@@ -171,6 +171,18 @@ properties:
       offer the power, Capability Mismatch is set. Required for power sink and
       power dual role.
 
+  accessory-mode-audio:
+    type: boolean
+    description: Whether the device supports Audio Adapter Accessory Mode. This
+      is only necessary if there are no other means to discover supported
+      alternative modes (e.g. through the UCSI firmware interface).
+
+  accessory-mode-debug:
+    type: boolean
+    description: Whether the device supports Debug Accessory Mode. This
+      is only necessary if there are no other means to discover supported
+      alternative modes (e.g. through the UCSI firmware interface).
+
   altmodes:
     type: object
     description: List of Alternative Modes supported by the schematics on the
-- 
2.42.0

[PATCH 2/2] usb: typec: tcpm: Parse Accessory Mode information

[Dmitry Baryshkov]

Some of the boards supported by the TCPM drivers can support USB-C
Accessory Modes (Analog Audio, Debug). Parse information about supported
modes from the device tree.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/usb/typec/tcpm/tcpm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 6e843c511b85..6297f803de53 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -6114,6 +6114,7 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
 {
 	const char *opmode_str;
 	int ret;
+	int mode;
 	u32 mw, frs_current;
 
 	if (!fwnode)
@@ -6132,6 +6133,12 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
 	if (ret < 0)
 		return ret;
 
+	if (fwnode_property_read_bool(fwnode, "accessory-mode-audio"))
+		port->typec_caps.accessory[mode++] = TYPEC_ACCESSORY_AUDIO;
+
+	if (fwnode_property_read_bool(fwnode, "accessory-mode-debug"))
+		port->typec_caps.accessory[mode++] = TYPEC_ACCESSORY_DEBUG;
+
 	port->port_type = port->typec_caps.type;
 	port->pd_supported = !fwnode_property_read_bool(fwnode, "pd-disable");
 
-- 
2.42.0

Re: [PATCH 2/2] usb: typec: tcpm: Parse Accessory Mode information

[Sergei Shtylyov]

On 11/21/23 2:11 AM, Dmitry Baryshkov wrote:

> Some of the boards supported by the TCPM drivers can support USB-C
> Accessory Modes (Analog Audio, Debug). Parse information about supported
> modes from the device tree.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 6e843c511b85..6297f803de53 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -6114,6 +6114,7 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
>  {
>  	const char *opmode_str;
>  	int ret;
> +	int mode;
>  	u32 mw, frs_current;
>  
>  	if (!fwnode)
> @@ -6132,6 +6133,12 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
>  	if (ret < 0)
>  		return ret;
>  
> +	if (fwnode_property_read_bool(fwnode, "accessory-mode-audio"))
> +		port->typec_caps.accessory[mode++] = TYPEC_ACCESSORY_AUDIO;
> +
> +	if (fwnode_property_read_bool(fwnode, "accessory-mode-debug"))
> +		port->typec_caps.accessory[mode++] = TYPEC_ACCESSORY_DEBUG;
> +

   Hm, I don't see where that mode variable is initialized?

[...]

MBR, Sergey