[PATCH v3 12/12] rtc: rzn1: Add support for Renesas RZ/T2H and RZ/N2H SoCs

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>

Add support for the RTC block found on the Renesas RZ/T2H (R9A09G077)
and RZ/N2H (R9A09G087) SoCs by matching the new
"renesas,r9a09g077-rtc" compatible string.

These SoCs integrate a closely related variant of the RZ/N1 RTC IP.
Unlike the RZ/N1 implementation, the RZ/T2H and RZ/N2H variants lack
the RTCA0SUBU register. However, this register is not accessed when
operating in SCMP mode using the existing rzn1_rtc_ops_scmp
configuration, allowing the current driver infrastructure to be reused
without modification.

The RZ/T2H RTC variant also supports a 1 Hz output signal on the
RTCAT1HZ pin, controlled by the RTCA0CTL1[RTCA01HZE] bit. This bit is
marked as reserved in the RZ/N1 hardware manual, making RZ/T2H a
distinct RTC variant despite its overall compatibility with the RZ/N1
implementation.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
Reviewed-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
v2->v3:
- No changes.

v1->v2:
- Updated commit message to drop reference about RTCA0TCR register.
- Added Reviewed-by tag.
---
 drivers/rtc/rtc-rzn1.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c
index 2c3c82f8c693..2a6ac98a206c 100644
--- a/drivers/rtc/rtc-rzn1.c
+++ b/drivers/rtc/rtc-rzn1.c
@@ -507,6 +507,7 @@ static int rzn1_rtc_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id rzn1_rtc_of_match[] = {
+	{ .compatible	= "renesas,r9a09g077-rtc" },
 	{ .compatible	= "renesas,rzn1-rtc" },
 	{},
 };
-- 
2.54.0