Merge branch 'meson8b'

Martin Blumenstingl says:

====================
Meson8m2 support for dwmac-meson8b

The Meson8m2 SoC is an updated version of the Meson8 SoC. Some of the
peripherals are shared with Meson8b (for example the watchdog registers
and the internal temperature sensor calibration procedure).
Meson8m2 also seems to include the same Gigabit MAC register layout as
Meson8b.

The registers in the Amlogic dwmac "glue" seem identical between Meson8b
and Meson8m2. Manual testing seems to confirm this.

To be extra-safe a new compatible string is added because there's no
(public) documentation on the Meson8m2 SoC. This will allow us to
implement any SoC-specific variations later on (if needed).
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/meson-dwmac.txt

@@ -9,6 +9,7 @@ Required properties on all platforms:
 - compatible:	Depending on the platform this should be one of:
 			- "amlogic,meson6-dwmac"
 			- "amlogic,meson8b-dwmac"
+			- "amlogic,meson8m2-dwmac"
 			- "amlogic,meson-gxbb-dwmac"
 		Additionally "snps,dwmac" and any applicable more
 		detailed version number described in net/stmmac.txt
@@ -19,13 +20,13 @@ Required properties on all platforms:
 	configuration (for example the PRG_ETHERNET register range
 	on Meson8b and newer)
 
-Required properties on Meson8b and newer:
+Required properties on Meson8b, Meson8m2, GXBB and newer:
 - clock-names:	Should contain the following:
 		- "stmmaceth" - see stmmac.txt
 		- "clkin0" - first parent clock of the internal mux
 		- "clkin1" - second parent clock of the internal mux
 
-Optional properties on Meson8b and newer:
+Optional properties on Meson8b, Meson8m2, GXBB and newer:
 - amlogic,tx-delay-ns:	The internal RGMII TX clock delay (provided
 			by this driver) in nanoseconds. Allowed values
 			are: 0ns, 2ns, 4ns, 6ns.

drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

 /*
- * Amlogic Meson8b and GXBB DWMAC glue layer
+ * Amlogic Meson8b, Meson8m2 and GXBB DWMAC glue layer
  *
  * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
  *
@@ -318,6 +318,7 @@ static int meson8b_dwmac_probe(struct platform_device *pdev)
 
 static const struct of_device_id meson8b_dwmac_match[] = {
 	{ .compatible = "amlogic,meson8b-dwmac" },
+	{ .compatible = "amlogic,meson8m2-dwmac" },
 	{ .compatible = "amlogic,meson-gxbb-dwmac" },
 	{ }
 };
@@ -335,5 +336,5 @@ static struct platform_driver meson8b_dwmac_driver = {
 module_platform_driver(meson8b_dwmac_driver);
 
 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
-MODULE_DESCRIPTION("Amlogic Meson8b and GXBB DWMAC glue layer");
+MODULE_DESCRIPTION("Amlogic Meson8b, Meson8m2 and GXBB DWMAC glue layer");
 MODULE_LICENSE("GPL v2");