[RFC PATCH 0/4] rtc: rzn1: support XTAL clk and SCMP method

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

So far, the code and the binding for the RZ/N1D RTC assumed an input
clock of 32768Hz, so it was not explicitly described. It makes sense to
do this, though. For one reason, clocks with other frequencies might be
used which this RTC supports via the SCMP counting method. Also, the
upcoming R-Car Gen5 have only the SCMP method described, so we need to
use it there.

This series is for collecting comments about the approach. I am aware
that the DTS changes no to go in separately from the code changes. And
the last patch will be updated and resent once I have tested these
patches on hardware. That might take a while but I'd like the
preparational patches to go in earlier. They are benefitial for N1D,
after all.

The series has been tested on a Renesas RZ/N1D board with hacked
devicetree values.

Looking forward to comments.


Wolfram Sang (4):
  dt-bindings: rtc: rzn1: add optional second clock
  ARM: dts: renesas: r9a06g032: add second clock input to RTC
  rtc: rzn1: support input frequencies other than 32768Hz
  WIP rtc: rzn1: add driver support for R-Car Gen5

 .../bindings/rtc/renesas,rzn1-rtc.yaml        |  8 ++-
 .../dts/renesas/r9a06g032-rzn1d400-db.dts     |  4 ++
 arch/arm/boot/dts/renesas/r9a06g032.dtsi      |  4 +-
 drivers/rtc/rtc-rzn1.c                        | 67 ++++++++++++++++---
 4 files changed, 70 insertions(+), 13 deletions(-)

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2.47.2