dt-bindings: sdhci-of-at91: new compatible string and update properties

There is a new compatible string for the SAM9X60 sdhci device. It involves
an update of the properties about the clocks stuff.
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20191128074522.69706-1-ludovic.desroches@microchip.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/sdhci-atmel.txt

@@ -5,11 +5,16 @@ Documentation/devicetree/bindings/mmc/mmc.txt and the properties used by the
 sdhci-of-at91 driver.
 
 Required properties:
-- compatible:		Must be "atmel,sama5d2-sdhci".
+- compatible:		Must be "atmel,sama5d2-sdhci" or "microchip,sam9x60-sdhci".
 - clocks:		Phandlers to the clocks.
-- clock-names:		Must be "hclock", "multclk", "baseclk";
+- clock-names:		Must be "hclock", "multclk", "baseclk" for
+			"atmel,sama5d2-sdhci".
+			Must be "hclock", "multclk" for "microchip,sam9x60-sdhci".
 
 Optional properties:
+- assigned-clocks:	The same with "multclk".
+- assigned-clock-rates	The rate of "multclk" in order to not rely on the
+			gck configuration set by previous components.
 - microchip,sdcal-inverted: when present, polarity on the SDCAL SoC pin is
   inverted. The default polarity for this signal is described in the datasheet.
   For instance on SAMA5D2, the pin is usually tied to the GND with a resistor
@@ -17,10 +22,12 @@ Optional properties:
 
 Example:
 
-sdmmc0: sdio-host@a0000000 {
+mmc0: sdio-host@a0000000 {
 	compatible = "atmel,sama5d2-sdhci";
 	reg = <0xa0000000 0x300>;
 	interrupts = <31 IRQ_TYPE_LEVEL_HIGH 0>;
 	clocks = <&sdmmc0_hclk>, <&sdmmc0_gclk>, <&main>;
 	clock-names = "hclock", "multclk", "baseclk";
+	assigned-clocks = <&sdmmc0_gclk>;
+	assigned-clock-rates = <480000000>;
 };