[PATCH 1/3] board: ti: common: add rtc setup to common folder

[Vignesh Raghavendra]

On 08/11/23 04:51, Bryan Brattlof wrote:
> All of the starter kit boards for the am62xxx extended family utilize
> the same 32k crystal oscillator for a more accurate clock for the RTC
> instance. Add the setup the clock mux and debounce configuration to the
> common board directory so the entire am62xxx extended family can utilize
> it.
> 
> Signed-off-by: Bryan Brattlof <bb at ti.com>
> ---
>  board/ti/common/Kconfig |  8 +++++++
>  board/ti/common/rtc.c   | 47 +++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 55 insertions(+)
>  create mode 100644 board/ti/common/rtc.c
> 
> diff --git a/board/ti/common/Kconfig b/board/ti/common/Kconfig
> index 49edd98014ab7..56a65c0a402bb 100644
> --- a/board/ti/common/Kconfig
> +++ b/board/ti/common/Kconfig
> @@ -1,3 +1,11 @@
> +config BOARD_HAS_32K_RTC_CRYSTAL
> +	bool "Enable the 32k crystial for RTC"
> +	help
> +	   Some of Texas Instrument's Starter-Kit boards have
> +	   an onboard 32k crystal. Select this option if you wish Uboot
> +	   to enable this crystal for Linux
> +	default n
> +
>  config TI_I2C_BOARD_DETECT
>  	bool "Support for Board detection for TI platforms"
>  	help
> diff --git a/board/ti/common/rtc.c b/board/ti/common/rtc.c
> new file mode 100644
> index 0000000000000..e117a927765c5
> --- /dev/null
> +++ b/board/ti/common/rtc.c
> @@ -0,0 +1,47 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * RTC setup for TI Platforms
> + *
> + * Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/
> + */
> +#include <asm/arch/hardware.h>
> +#include <asm/io.h>
> +#include <log.h>
> +
> +#define WKUP_CTRLMMR_DBOUNCE_CFG1 0x04504084
> +#define WKUP_CTRLMMR_DBOUNCE_CFG2 0x04504088
> +#define WKUP_CTRLMMR_DBOUNCE_CFG3 0x0450408c
> +#define WKUP_CTRLMMR_DBOUNCE_CFG4 0x04504090
> +#define WKUP_CTRLMMR_DBOUNCE_CFG5 0x04504094
> +#define WKUP_CTRLMMR_DBOUNCE_CFG6 0x04504098
> +
> +void board_rtc_init(void)
> +{
> +	u32 val;
> +
> +	/* We have 32k crystal, so lets enable it */
> +	val = readl(MCU_CTRL_LFXOSC_CTRL);
> +	val &= ~(MCU_CTRL_LFXOSC_32K_DISABLE_VAL);
> +	writel(val, MCU_CTRL_LFXOSC_CTRL);
> +
> +	/* Add any TRIM needed for the crystal here.. */
> +	/* Make sure to mux up to take the SoC 32k from the crystal */
> +	writel(MCU_CTRL_DEVICE_CLKOUT_LFOSC_SELECT_VAL,
> +	       MCU_CTRL_DEVICE_CLKOUT_32K_CTRL);
> +
> +	/* Setup debounce conf registers - arbitrary values.
> +	 * Times are approx
> +	 */
> +	/* 1.9ms debounce @ 32k */
> +	writel(WKUP_CTRLMMR_DBOUNCE_CFG1, 0x1);
> +	/* 5ms debounce @ 32k */
> +	writel(WKUP_CTRLMMR_DBOUNCE_CFG2, 0x5);
> +	/* 20ms debounce @ 32k */
> +	writel(WKUP_CTRLMMR_DBOUNCE_CFG3, 0x14);
> +	/* 46ms debounce @ 32k */
> +	writel(WKUP_CTRLMMR_DBOUNCE_CFG4, 0x18);
> +	/* 100ms debounce @ 32k */
> +	writel(WKUP_CTRLMMR_DBOUNCE_CFG5, 0x1c);
> +	/* 156ms debounce @ 32k */
> +	writel(WKUP_CTRLMMR_DBOUNCE_CFG6, 0x1f);
> +}


Pad Debounce settings has nothing to do with RTC. This doesn't belong to
board_rtc_init()

-- 
Regards
Vignesh