[PATCH] board: freescale: p1_p2_rdb_pc: Delete watchdog max6370 node in load_default mode

[Pali Rohár]

PING? (This change applies also for Turris 1.x boards; which use same CPLD firmware code)

On Monday 01 August 2022 15:35:43 Pali Rohár wrote:
> CPLD in load_default mode ignores watchdog reset signal. It does not reset
> board when watchdog triggers reset signal.
> 
> Detect load_default mode by GPIO7 - LOAD_DEFAULT_N and delete watchdog
> max6370 node from device to prevent registering driver for non-working
> watchdog.
> 
> Signed-off-by: Pali Rohár <pali at kernel.org>
> ---
>  board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c | 28 +++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c b/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
> index a71952dcf399..06cab729e4ab 100644
> --- a/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
> +++ b/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
> @@ -368,6 +368,24 @@ int board_eth_init(struct bd_info *bis)
>  }
>  #endif
>  
> +#if defined(CONFIG_OF_BOARD_SETUP) || defined(CONFIG_OF_BOARD_FIXUP)
> +static void fix_max6370_watchdog(void *blob)
> +{
> +	int off = fdt_node_offset_by_compatible(blob, -1, "maxim,max6370");
> +	ccsr_gpio_t *pgpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
> +	u32 gpioval = in_be32(&pgpio->gpdat);
> +
> +	/*
> +	 * Delete watchdog max6370 node in load_default mode (detected by
> +	 * GPIO7 - LOAD_DEFAULT_N) because CPLD in load_default mode ignores
> +	 * watchdog reset signal. CPLD in load_default mode does not reset
> +	 * board when watchdog triggers reset signal.
> +	 */
> +	if (!(gpioval & BIT(31-7)) && off >= 0)
> +		fdt_del_node(blob, off);
> +}
> +#endif
> +
>  #ifdef CONFIG_OF_BOARD_SETUP
>  int ft_board_setup(void *blob, struct bd_info *bd)
>  {
> @@ -393,6 +411,8 @@ int ft_board_setup(void *blob, struct bd_info *bd)
>  			sizeof("okay"), 0);
>  #endif
>  
> +	fix_max6370_watchdog(blob);
> +
>  #if defined(CONFIG_HAS_FSL_DR_USB)
>  	fsl_fdt_fixup_dr_usb(blob, bd);
>  #endif
> @@ -444,3 +464,11 @@ int ft_board_setup(void *blob, struct bd_info *bd)
>  	return 0;
>  }
>  #endif
> +
> +#ifdef CONFIG_OF_BOARD_FIXUP
> +int board_fix_fdt(void *blob)
> +{
> +	fix_max6370_watchdog(blob);
> +	return 0;
> +}
> +#endif
> -- 
> 2.20.1
>