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

[Peng Fan]

Hi Pali,

On 8/18/2022 5:05 AM, Pali Rohár wrote:
> PING? (This change applies also for Turris 1.x boards; which use same CPLD firmware code)
> 

Since your patches not show in my patchwork, I missed to pick up your 
patches. BTW, is this a fix to need flow into 2022.10? or could wait next?

Thanks,
Peng.

> 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
>>