netdev - [PATCH RFC v2 02/11] dt-bindings: net: dwmac-meson: Document the "timing-adjustment" clock

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Date:   Wed, 29 Apr 2020 22:16:35 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     robh+dt@...nel.org, andrew@...n.ch, f.fainelli@...il.com,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org
Cc:     jianxin.pan@...ogic.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH RFC v2 02/11] dt-bindings: net: dwmac-meson: Document the "timing-adjustment" clock

The PRG_ETHERNET registers can add an RX delay in RGMII mode. This
requires an internal re-timing circuit whose input clock is called
"timing adjustment clock". Document this clock input so the clock can be
enabled as needed.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 .../devicetree/bindings/net/amlogic,meson-dwmac.yaml   | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
index 8d851f59d9f2..2bc0e8b0d25b 100644
--- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
@@ -40,18 +40,22 @@ allOf:
     then:
       properties:
         clocks:
+          minItems: 3
+          maxItems: 4
           items:
             - description: GMAC main clock
             - description: First parent clock of the internal mux
             - description: Second parent clock of the internal mux
+            - description: The clock which drives the timing adjustment logic
 
         clock-names:
           minItems: 3
-          maxItems: 3
+          maxItems: 4
           items:
             - const: stmmaceth
             - const: clkin0
             - const: clkin1
+            - const: timing-adjustment
 
         amlogic,tx-delay-ns:
           $ref: /schemas/types.yaml#definitions/uint32
@@ -120,7 +124,7 @@ examples:
          reg = <0xc9410000 0x10000>, <0xc8834540 0x8>;
          interrupts = <8>;
          interrupt-names = "macirq";
-         clocks = <&clk_eth>, <&clkc_fclk_div2>, <&clk_mpll2>;
-         clock-names = "stmmaceth", "clkin0", "clkin1";
+         clocks = <&clk_eth>, <&clk_fclk_div2>, <&clk_mpll2>, <&clk_fclk_div2>;
+         clock-names = "stmmaceth", "clkin0", "clkin1", "timing-adjustment";
          phy-mode = "rgmii";
     };
-- 
2.26.2