linux-kernel - [PATCH v2 2/4] dt-bindings: net: can: Add poll-interval for MCAN

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Message-ID: <20230424195402.516-3-jm@ti.com>
Date:   Mon, 24 Apr 2023 14:54:00 -0500
From:   Judith Mendez <jm@...com>
To:     Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, <linux-can@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Schuyler Patton <spatton@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>,
        Oliver Hartkopp <socketcan@...tkopp.net>
Subject: [PATCH v2 2/4] dt-bindings: net: can: Add poll-interval for MCAN

On AM62x SoC, MCANs on MCU domain do not have hardware interrupt
routed to A53 Linux, instead they will use software interrupt by
hrtimer. To enable timer method, interrupts should be optional so
remove interrupts property from required section and introduce
poll-interval property.

Signed-off-by: Judith Mendez <jm@...com>
---
Changelog:
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         | 26 ++++++++++++++++---
 1 file changed, 23 insertions(+), 3 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..1c64c7a0c3df 100644
--- a/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
+++ b/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
@@ -40,6 +40,10 @@ properties:
       - const: int1
     minItems: 1
 
+  poll-interval:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: Poll interval time in milliseconds.
+
   clocks:
     items:
       - description: peripheral clock
@@ -122,15 +126,13 @@ required:
   - compatible
   - reg
   - reg-names
-  - interrupts
-  - interrupt-names
   - clocks
   - clock-names
   - bosch,mram-cfg
 
 additionalProperties: false
 
-examples:
+example with interrupts:
   - |
     #include <dt-bindings/clock/imx6sx-clock.h>
     can@...8000 {
@@ -149,4 +151,22 @@ examples:
       };
     };
 
+example with timer polling:
+  - |
+    #include <dt-bindings/clock/imx6sx-clock.h>
+    can@...8000 {
+      compatible = "bosch,m_can";
+      reg = <0x020e8000 0x4000>, <0x02298000 0x4000>;
+      reg-names = "m_can", "message_ram";
+      poll-interval;
+      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>;
+      };
+    };
+
 ...
-- 
2.17.1