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, the upcoming R-Car Gen5 has 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/rtc Looking forward to comments! Changes since RFC: * add binding tag from Krzysztof (Thanks!) * new patch to disable controller before initially modifying CTL0 * cosmetic changes 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 | 59 +++++++++++++++---- 2 files changed, 53 insertions(+), 14 deletions(-) -- 2.47.2
