Re: [PATCH v23 02/13] power: reset: reboot-mode: Support up to 3 magic values per mode

[Shivendra Pratap <shivendra.pratap@oss.qualcomm.com>]

On 22-07-2026 15:20, Pavan Kondeti wrote:
> On Tue, Jul 14, 2026 at 10:46:30PM +0530, Shivendra Pratap wrote:
>> ARM PSCI vendor-specific resets, require a 32-bit reset_type and a 64-bit
>> cookie as arguments. This cannot be implemented via the reboot-mode
>> framework, which supports a single 32-bit argument as magic value.
>>
>> Extend the reboot-mode framework to support up to three 32-bit arguments
>> as magic, per reboot-mode.
>>
>> Signed-off-by: Shivendra Pratap <shivendra.pratap@oss.qualcomm.com>
>> ---
>>   drivers/power/reset/nvmem-reboot-mode.c  | 10 ++++----
>>   drivers/power/reset/qcom-pon.c           |  8 ++++---
>>   drivers/power/reset/reboot-mode.c        | 41 +++++++++++++++++++++-----------
>>   drivers/power/reset/syscon-reboot-mode.c |  8 ++++---
>>   include/linux/reboot-mode.h              |  4 +++-
>>   5 files changed, 46 insertions(+), 25 deletions(-)
>>
>> diff --git a/drivers/power/reset/nvmem-reboot-mode.c b/drivers/power/reset/nvmem-reboot-mode.c
>> index d260715fccf6..ac69b5f39fb4 100644
>> --- a/drivers/power/reset/nvmem-reboot-mode.c
>> +++ b/drivers/power/reset/nvmem-reboot-mode.c
>> @@ -17,14 +17,16 @@ struct nvmem_reboot_mode {
>>   	struct nvmem_cell *cell;
>>   };
>>   
>> -static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot,
>> -				    unsigned int magic)
>> +static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot, u32 *magic, int count)
>>   {
>>   	struct nvmem_reboot_mode *nvmem_rbm;
>>   	size_t buf_len;
>>   	void *buf;
>>   	int ret;
>>   
>> +	if (count != 1)
>> +		return -EINVAL;
>> +
> 
> The count can be different per mode. Because `struct mode_info` has
> `count` member. This single `count` check across all modes may not be
> useful.
> 
> Either drivers need to use count passed to them or drivers needs to
> receive `struct mode_info` in the callabck.

will add a once more write function in reboot-mode to handle the 
multi-count support. If a driver implements it, the multi-count write 
function will be called. And no change in existing drivers.
Does that address this concern?

thanks,
Shivendra