Re: [PATCH v23 09/13] mfd: psci-mfd: Add psci-reboot-mode child cell

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

On 15-07-2026 18:44, Bartosz Golaszewski wrote:
> On Tue, 14 Jul 2026 19:16:37 +0200, Shivendra Pratap
> <shivendra.pratap@oss.qualcomm.com> said:
>> The PSCI "reboot-mode" node does not define a compatible because it is a
>> configuration of boot-states provided by the underlying firmware. With
>> the new firmware-node based cells in mfd-core, this node can now be
>> exposed as a proper child cell.
>>
>> Add the psci-reboot-mode child cell to the psci-mfd driver with a
>> named_fwnode. Add psci-cpuidle-domain cell first to isolate it from
>> reboot-mode failures.
>>
>> Suggested-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
>> Signed-off-by: Shivendra Pratap <shivendra.pratap@oss.qualcomm.com>
>> ---
>>   drivers/mfd/psci-mfd.c      | 30 +++++++++++++++++++++++++++++-
>>   drivers/power/reset/Kconfig |  2 +-
>>   2 files changed, 30 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mfd/psci-mfd.c b/drivers/mfd/psci-mfd.c
>> index 7affd6bb09dd..8c6b78ac471b 100644
>> --- a/drivers/mfd/psci-mfd.c
>> +++ b/drivers/mfd/psci-mfd.c
>> @@ -7,6 +7,7 @@
>>   #include <linux/module.h>
>>   #include <linux/of.h>
>>   #include <linux/platform_device.h>
>> +#include <linux/property.h>
>>
>>   static const struct mfd_cell psci_cells[] = {
>>   	{
>> @@ -14,10 +15,37 @@ static const struct mfd_cell psci_cells[] = {
>>   	},
>>   };
>>
>> +static const struct mfd_cell psci_reboot_mode_cell[] = {
>> +	{
>> +		.name = "psci-reboot-mode",
>> +		.named_fwnode = "reboot-mode",
>> +	},
>> +};
>> +
>>   static int psci_mfd_probe(struct platform_device *pdev)
>>   {
>> -	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, psci_cells,
>> +	struct fwnode_handle *fwnode;
>> +	int ret;
>> +
>> +	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, psci_cells,
>>   				   ARRAY_SIZE(psci_cells), NULL, 0, NULL);
>> +	if (ret)
>> +		return ret;
>> +
>> +	fwnode = device_get_named_child_node(&pdev->dev, "reboot-mode");
>> +	if (!fwnode)
>> +		return 0;
>> +
>> +	fwnode_handle_put(fwnode);
>> +
>> +	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
>> +				   psci_reboot_mode_cell,
>> +				   ARRAY_SIZE(psci_reboot_mode_cell),
>> +				   NULL, 0, NULL);
>> +	if (ret)
>> +		dev_warn(&pdev->dev, "reboot-mode child cell failed to add: %d\n", ret);
> 
> Why do we have to look up the named node here anyway? Shouldn't MFD core handle
> that already in a generic way?

yes. MFD is handling this. Will remove this explicit check.

thanks,
Shivendra