[PATCH v2 4/4] PCI: mvebu: Add support for sending Set_Slot_Power_Limit message

[Rob Herring]

On Wed, Mar 02, 2022 at 03:57:33PM +0100, Pali Rohár wrote:
> If DT supplies the 'slot-power-limit-milliwatt' property, program
> the value in the Slot Power Limit in the Slot Capabilities register
> and program the Root Port to send a Set_Slot_Power_Limit Message
> when the Link transitions to DL_Up.
> 
> Signed-off-by: Pali Rohár <pali at kernel.org>
> ---
> Changes in v2:
> * Fix handling of slot power limit with scale x1.0 (0x00 value)
> * Use FIELD_PREP instead of _SHIFT macros
> * Changed commit message to Bjorn's suggestion
> * Changed comments in the code to match PCIe spec
> * Preserve user settings of PCI_EXP_SLTCTL_ASPL_DISABLE bit
> ---
>  drivers/pci/controller/pci-mvebu.c | 96 ++++++++++++++++++++++++++++--
>  1 file changed, 91 insertions(+), 5 deletions(-)

Reviewed-by: Rob Herring <robh at kernel.org>