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. This RTC supports that via the SCMP counting method. The other reason is, upcoming SoCs may have only the SCMP method described, so we need to use it there later. This series lets the driver handle the optional "xtal" clock and switch to the SCMP method if suitable. It has been tested on a Renesas RZ/N1D board with hacked devicetree values. A branch with updated DTs can be found here: git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/n1d/enablement Looking forward to comments! Changes since v2: * don't modify the rtc_ops struct, but have two distinct ones which can now be const again (Thanks Miquel, I like it better, too) * added tag from Miquel (Thanks again) Wolfram Sang (3): dt-bindings: rtc: rzn1: add optional second clock rtc: rzn1: Disable controller before initialization rtc: rzn1: support input frequencies other than 32768Hz .../bindings/rtc/renesas,rzn1-rtc.yaml | 8 ++- drivers/rtc/rtc-rzn1.c | 66 +++++++++++++++---- 2 files changed, 61 insertions(+), 13 deletions(-) -- 2.47.2
