On AM62x SoC, MCANs on MCU domain do not have hardware interrupt
routed to A53 Linux, instead they will use software interrupt by
timer polling.
To enable timer polling method, interrupts should be
optional so remove interrupts property from required section and
add an example for MCAN node with timer polling enabled.
Reviewed-by: Tony Lindgren <tony@xxxxxxxxxxx>
Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Signed-off-by: Judith Mendez <jm@xxxxxx>
---
Changelog:
v6-v9:
1. No changes
v5:
1. Remove poll-interval
2. Remove oneOf that selects interrupts/interrupt-names or poll-interval
v3:
1. Update binding poll-interval description
2. Add oneOf to select interrupts/interrupt-names or poll-interval
v2:
1. Add poll-interval property to enable timer polling method
2. Add example using poll-interval property
---
.../bindings/net/can/bosch,m_can.yaml | 20 +++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml b/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
index 67879aab623b..bb518c831f7b 100644
--- a/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
+++ b/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
@@ -122,8 +122,6 @@ required:
- compatible
- reg
- reg-names
- - interrupts
- - interrupt-names
- clocks
- clock-names
- bosch,mram-cfg
@@ -132,6 +130,7 @@ additionalProperties: false
examples:
- |
+ // Example with interrupts
#include <dt-bindings/clock/imx6sx-clock.h>
can@20e8000 {
compatible = "bosch,m_can";
@@ -149,4 +148,21 @@ examples:
};
};
+ - |
+ // Example with timer polling
+ #include <dt-bindings/clock/imx6sx-clock.h>
+ can@20e8000 {
+ compatible = "bosch,m_can";
+ reg = <0x020e8000 0x4000>, <0x02298000 0x4000>;
+ reg-names = "m_can", "message_ram";
+ clocks = <&clks IMX6SX_CLK_CANFD>,
+ <&clks IMX6SX_CLK_CANFD>;
+ clock-names = "hclk", "cclk";
+ bosch,mram-cfg = <0x0 0 0 32 0 0 0 1>;
+
+ can-transceiver {
+ max-bitrate = <5000000>;
+ };
+ };
+
...
--
2.34.1
