[PATCH net-next 05/16] dt-bindings: net: dwmac: Elaborate snps,clk-csr description

[Serge Semin <Sergey.Semin@baikalelectronics.ru>]

The property is utilized to set the CSR-MDC clock selector in the STMMAC
driver. The specified value is used instead of auto-detecting the
CSR/application clocks divider based on the reference clock rate. Let's
add a more detailed description to clarify the property purpose and
permitted values. In the later case the constraints are specified based on
the DW *MAC CR registers permitted values.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
---
 Documentation/devicetree/bindings/net/snps,dwmac.yaml | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
index 224f8f70db85..edef405766e4 100644
--- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
@@ -427,7 +427,15 @@ properties:
   snps,clk-csr:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
-      Frequency division factor for MDC clock.
+      CSR-MDC clock selector. It sets up a divider of the CSR/application
+      clock to create an MDC signal with desired frequency. Note the
+      property value doesn't specify the divider itself by encodes the
+      corresponding divider value specific to the IP-core.
+      DW GMAC 0 - 42, 1 - 62, 2 - 16, 3 - 26, 4 - 102, 5 - 124, 8 - 4,
+              9 - 6, 10 - 8, 11 - 10, 12 - 12, 13 - 14, 14 - 16, 15 - 18.
+      DW xGMAC 0 - 62, 1 - 102, 2 - 122, 3 - 142, 4 - 162, 5 - 202.
+    minimum: 0
+    maximum: 15
 
   mdio:
     $ref: mdio.yaml#
-- 
2.39.2