On 12/22/23 09:20, Krzysztof Kozlowski wrote:
On 21/12/2023 15:05, Michal Simek wrote:
Debug Communication Channel (DCC) provides the way how to pass data between
target CPU and host via JTAG interface. Every CPU has own interface for
communication via dbgdtrtx_el0 and dbgdtrrx_el0 registers.
Signed-off-by: Michal Simek <michal.simek@xxxxxxx>
---
This communication interface is used for flash programming on Xilinx
SOCs from U-Boot.
https://source.denx.de/u-boot/u-boot/-/blob/master/drivers/serial/arm_dcc.c
---
.../devicetree/bindings/serial/arm,dcc.yaml | 30 +++++++++++++++++++
1 file changed, 30 insertions(+)
create mode 100644 Documentation/devicetree/bindings/serial/arm,dcc.yaml
diff --git a/Documentation/devicetree/bindings/serial/arm,dcc.yaml b/Documentation/devicetree/bindings/serial/arm,dcc.yaml
new file mode 100644
index 000000000000..fd0589356617
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/arm,dcc.yaml
@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/arm,dcc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM DCC (Data communication channel) serial emulation
+
+maintainers:
+ - Michal Simek <michal.simek@xxxxxxx>
+
+description: |
+ ARM DCC (Data communication channel) serial emulation interface available
+ via JTAG can be also used as one of serial line tightly coupled with every
+ ARM CPU available in the system.
+
+properties:
+ compatible:
+ const: arm,dcc
+
+required:
+ - compatible
no allOf: with $ref to serial.yaml? Does it differ somehow?
Valid one could be only nodename format and maybe label.
Others are not relevant. But if that's fine I can also add it.
Thanks,
Michal
