[RFC 10/37] soc: renesas: rcar-rst: Enable watchdog as reset trigger for Gen2

This patch allows for platform specific quirks as some of the SoC need
further customization for the watchdog to work properly, like for R-Car
Gen2 and for RZ/G.

Signed-off-by: Fabrizio Castro <redacted>
Signed-off-by: Ramesh Shanmugasundaram <redacted>
---
  drivers/soc/renesas/rcar-rst.c | 21 ++++++++++++++++++++-
  1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/renesas/rcar-rst.c b/drivers/soc/renesas/rcar-rst.c
index f7a0d54..5f52aea 100644
--- a/drivers/soc/renesas/rcar-rst.c
+++ b/drivers/soc/renesas/rcar-rst.c

@@ -13,8 +13,18 @@
  #include <linux/of_address.h>
  #include <linux/soc/renesas/rcar-rst.h>
  
+#define WDTRSTCR_RESET		0xA55A0002
+#define WDTRSTCR		0x0054
+
+static int gen2_configuration(void __iomem *base)
+{
+	iowrite32(WDTRSTCR_RESET, base + WDTRSTCR);
+	return 0;
+}
+
  struct rst_config {
-	unsigned int modemr;	/* Mode Monitoring Register Offset */
+	unsigned int modemr;		/* Mode Monitoring Register Offset */
+	int (*configure)(void *base);	/* Platform specific configuration */
  };
  
  static const struct rst_config rcar_rst_gen1 __initconst = {

@@ -23,6 +33,7 @@ static const struct rst_config rcar_rst_gen1 __initconst = {
  
  static const struct rst_config rcar_rst_gen2 __initconst = {
  	.modemr = 0x60,
+	.configure = gen2_configuration,