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From:   Pranavi Somisetty <pranavi.somisetty@amd.com>
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Subject: [PATCH net-next v3 1/2] dt-bindings: net: cdns,macb: Add rx-watermark property
Date:   Tue, 30 May 2023 03:51:37 -0600
Message-ID: <20230530095138.1302-2-pranavi.somisetty@amd.com>
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watermark value is the minimum amount of packet data
required to activate the forwarding process. The watermark
implementation and maximum size is dependent on the device
where Cadence MACB/GEM is used.

Signed-off-by: Pranavi Somisetty <pranavi.somisetty@amd.com>
---
Changes v2:
None (patch added in v2)

Changes v3:
1. Fixed DT schema error: "scalar properties shouldn't have array keywords".
2. Modified description of rx-watermark to include units of the watermark value.
3. Modified the DT property name corresponding to rx_watermark in
pbuf_rxcutthru to "cdns,rx-watermark".
4. Modified commit description to remove references to Xilinx platforms,
since the changes aren't platform specific.
--- 
 Documentation/devicetree/bindings/net/cdns,macb.yaml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/cdns,macb.yaml b/Documentation/devicetree/bindings/net/cdns,macb.yaml
index bef5e0f895be..2c733c061dce 100644
--- a/Documentation/devicetree/bindings/net/cdns,macb.yaml
+++ b/Documentation/devicetree/bindings/net/cdns,macb.yaml
@@ -109,6 +109,14 @@ properties:
   power-domains:
     maxItems: 1
 
+  cdns,rx-watermark:
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Set watermark value for pbuf_rxcutthru reg and enable
+      rx partial store and forward. Watermark value here
+      corresponds to number of SRAM locations. The width of SRAM is
+      system dependent and can be 4,8 or 16 bytes.
+
   '#address-cells':
     const: 1
 
@@ -166,6 +174,7 @@ examples:
             compatible = "cdns,macb";
             reg = <0xfffc4000 0x4000>;
             interrupts = <21>;
+            cdns,rx-watermark = /bits/ 16 <0x44>;
             phy-mode = "rmii";
             local-mac-address = [3a 0e 03 04 05 06];
             clock-names = "pclk", "hclk", "tx_clk";
-- 
2.36.1