From 4de127a44a45a8135756d4a7f26919393b91bb32 Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Wed, 23 Oct 2024 08:09:23 +0200 Subject: [PATCH] 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 --- arch/arm/dts/zynqmp-sm-k26-revA.dts | 1 + configs/xilinx_zynqmp_kria_defconfig | 1 - 2 files changed, 1 insertion(+), 1 deletion(-) 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 -- 2.39.5