From: Michal Simek Date: Wed, 23 Oct 2024 06:09:23 +0000 (+0200) Subject: arm64: zynqmp: Configure SoC RTC on SOM X-Git-Url: http://git.dujemihanovic.xyz/html/static/%7B%7B%20%24.Site.BaseURL%20%7D%7Dposts/index.xml?a=commitdiff_plain;h=4de127a44a45a8135756d4a7f26919393b91bb32;p=u-boot.git arm64: zynqmp: Configure SoC RTC on SOM Use RTC available in HW on Kria SOM without using emulation that's why configure it properly and disable emulated one. Power on reset value of RTC Calibration register without battery backup is not matching with crystal frequency which leads to RTC time drift. That's why write CALIB_WRITE register with crystal frequency (0x7FFF). There is also an option to write zero so that Linux will set default value (0x7FFF) in driver probe but calibration 0 is not permited by DT schema. Co-developed-by: Srinivas Goud Signed-off-by: Srinivas Goud Signed-off-by: Michal Simek Link: https://lore.kernel.org/r/9b684faeec85381b9b8fe796aaebc2ee79f17b8e.1729663761.git.michal.simek@amd.com --- diff --git a/arch/arm/dts/zynqmp-sm-k26-revA.dts b/arch/arm/dts/zynqmp-sm-k26-revA.dts index 8056f6b176..8c43ade940 100644 --- a/arch/arm/dts/zynqmp-sm-k26-revA.dts +++ b/arch/arm/dts/zynqmp-sm-k26-revA.dts @@ -387,6 +387,7 @@ &rtc { status = "okay"; + calibration = <0x7fff>; }; &lpd_dma_chan1 { diff --git a/configs/xilinx_zynqmp_kria_defconfig b/configs/xilinx_zynqmp_kria_defconfig index dd4df0b2da..0dddf69c5d 100644 --- a/configs/xilinx_zynqmp_kria_defconfig +++ b/configs/xilinx_zynqmp_kria_defconfig @@ -187,7 +187,6 @@ CONFIG_DM_PWM=y CONFIG_PWM_CADENCE_TTC=y CONFIG_RESET_ZYNQMP=y CONFIG_DM_RTC=y -CONFIG_RTC_EMULATION=y CONFIG_RTC_ZYNQMP=y CONFIG_SCSI=y CONFIG_ARM_DCC=y