linux-kernel - [PATCH net-next v3 1/2] dt-bindings: net: cdns,macb: Add rx-watermark property

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Message-ID: <20230530095138.1302-2-pranavi.somisetty@amd.com>
Date:   Tue, 30 May 2023 03:51:37 -0600
From:   Pranavi Somisetty <pranavi.somisetty@....com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <nicolas.ferre@...rochip.com>,
        <claudiu.beznea@...rochip.com>
CC:     <git@....com>, <michal.simek@....com>, <harini.katakam@....com>,
        <radhey.shyam.pandey@....com>, <pranavi.somisetty@....com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: [PATCH net-next v3 1/2] dt-bindings: net: cdns,macb: Add rx-watermark property

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@....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