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[0/5] RTC: update APM X-Gene RTC driver by adding the pre-scaler support

Message ID 20240412080238.134191-1-wefu@redhat.com
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Series RTC: update APM X-Gene RTC driver by adding the pre-scaler support | expand

Message

Wei Fu April 12, 2024, 8:01 a.m. UTC 
From: Wei Fu <wefu@redhat.com>

This patch add Counter Prescaler support in APM X-Gene RTC driver by
getting prescaler (Optional) property value from dtb. 

This hardware support can only be found in DW_apb_rtc after v2.06a.

And adds the optional property "prescaler" in bindings for APM X-Gene RTC.
Because the clock source on some platform to RTC is NOT 1HZ,
so we need to prescale the clock to make the input clock become 1HZ,
like (32K/prescaler) = 1HZ on the XuanTie TH1520 AP sub-system RTC.

This patch also add "snps,dw-apb-rtc" into the "compatible".

Since XuanTie TH1520 is using the same RTC, so this patch enables 
APM X-Gene RTC driver for XuanTie TH1520, and add a device node in 
the XuanTie TH1520 Soc dts: th1520.dtsi.

Wei Fu (5):
  drivers/rtc/rtc-xgene: Add prescaler support in APM X-Gene RTC driver
  dt-bindings: rtc: Add optional property "prescaler" in APM X-Gene RTC
    Document
  drivers/rtc/rtc-xgene: Add "snps,dw-apb-rtc" into the "compatible"
  Kconfig: Enable APM X-Gene RTC for XuanTie TH1520
  riscv: dts: thead: Add XuanTie TH1520 RTC device node

 .../devicetree/bindings/rtc/xgene-rtc.txt     | 16 ++++++++++
 arch/riscv/boot/dts/thead/th1520.dtsi         | 11 +++++++
 drivers/rtc/Kconfig                           | 12 ++++++-
 drivers/rtc/rtc-xgene.c                       | 32 +++++++++++++++++++
 4 files changed, 70 insertions(+), 1 deletion(-)