soc: bcm: brcmstb: pm: Add support for newer rev B3.0 controllers

Update the Device Tree binding document and add a matching entry for the
MEMC DDR controller revision B3.0 which is found on chips like 7278A0
and newer.

Signed-off-by: Doug Berger <opendmb@gmail.com>
[florian: tweak commit message, make it apply to upstream kernel]
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt

@@ -190,6 +190,7 @@ Power-Down (SRPD), among other things.
 Required properties:
 - compatible     : should contain one of these
 	"brcm,brcmstb-memc-ddr-rev-b.2.2"
+	"brcm,brcmstb-memc-ddr-rev-b.3.0"
 	"brcm,brcmstb-memc-ddr"
 - reg            : the MEMC DDR register range
 

drivers/soc/bcm/brcmstb/pm/pm-arm.c

@@ -631,6 +631,10 @@ static const struct of_device_id brcmstb_memc_of_match[] = {
 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.2",
 		.data = &ddr_seq_b22,
 	},
+	{
+		.compatible = "brcm,brcmstb-memc-ddr-rev-b.3.0",
+		.data = &ddr_seq_b22,
+	},
 	{
 		.compatible = "brcm,brcmstb-memc-ddr",
 		.data = &ddr_seq,