ARM: rmobile: Drop PRR syscon driver

The PRR syscon driver is available too late for Multi DTB build
of U-Boot. Replace it with simple check whether a platform is
Gen3 or not and produce an address of the PRR.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>

arch/arm/mach-rmobile/cpu_info-rcar.c

@@ -11,7 +11,14 @@
 #define R8A7796_REV_1_0		0x5200
 #define R8A7796_REV_1_1		0x5210
 
-static u32 rmobile_get_prr(void);
+static u32 rmobile_get_prr(void)
+{
+#ifdef CONFIG_RCAR_GEN3
+	return readl(0xFFF00044);
+#else
+	return readl(0xFF000044);
+#endif
+}
 
 u32 rmobile_get_cpu_type(void)
 {
@@ -37,55 +44,3 @@ u32 rmobile_get_cpu_rev_fraction(void)
 	else
 		return prr & 0x0000000F;
 }
-
-#if !CONFIG_IS_ENABLED(DM) || !CONFIG_IS_ENABLED(SYSCON)
-static u32 rmobile_get_prr(void)
-{
-	/*
-	 * On RCar/RMobile Gen2 and older systems, the PRR is always
-	 * located at the address below. On newer systems, the PRR
-	 * may be located at different address, but that information
-	 * is obtained from DT. This code will be removed when all
-	 * of the older systems get converted to DM and OF control.
-	 */
-	return readl(0xFF000044);
-}
-#else
-
-#include <dm.h>
-#include <syscon.h>
-#include <regmap.h>
-
-struct renesas_prr_priv {
-	fdt_addr_t	regs;
-};
-
-enum {
-	PRR_RCAR,
-};
-
-static u32 rmobile_get_prr(void)
-{
-	struct regmap *map;
-
-	map = syscon_get_regmap_by_driver_data(PRR_RCAR);
-	if (!map) {
-		printf("PRR regmap failed!\n");
-		hang();
-	}
-
-	return readl(map->ranges[0].start);
-}
-
-static const struct udevice_id renesas_prr_ids[] = {
-	{ .compatible = "renesas,prr", .data = PRR_RCAR },
-	{ }
-};
-
-U_BOOT_DRIVER(renesas_prr) = {
-	.name	= "renesas_prr",
-	.id	= UCLASS_SYSCON,
-	.of_match = renesas_prr_ids,
-	.flags	= DM_FLAG_PRE_RELOC,
-};
-#endif