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Introduce scmi-pinctrl driver support #3

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Introduce scmi-pinctrl driver support #3

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Commits on Dec 1, 2021

  1. scmi: Introduce pinctrl scmi protocol driver 

    Implementation of the SCMI client driver, which implements
PINCTRL_PROTOCOL. This protocol has id 18 and described in
DEN0056C document.
This protocol is the part of the feature that was designed
to separate pinctrl subsystem to SCP firmware. The idea is to
separate communication of the pin control subsystemd with the HW
to SCP firmware (or similar system, such as ATF), which provides
interface to give OS ability to control HW through SCMI protocol.
This is generic driver, which implements SCMI protocol, independent
from the platform type.

DEN0056C document:
https://developer.arm.com/documentation/den0056/latest

Signed-off-by: Oleksii Moisieiev <[email protected]>
    @oleksiimoisieiev
    oleksiimoisieiev committed Dec 1, 2021
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  2. pinctrl: Implementation of the generic scmi-pinctrl driver 

    scmi-pinctrl driver implements pinctrl driver interface and using
SCMI protocol to redirect messages from pinctrl subsystem SDK to
SCP firmware, which does the changes in HW.

This setup expects SCP firmware (or similar system, such as ATF)
to be installed on the platform, which implements pinctrl driver
for the specific platform.

SCMI-Pinctrl driver should be configured from the device-tree.
The following binding shows the configuration for Renesas H3ULCB
for r8a77951 as an example:
 Documentation/devicetree/bindings/renesas-scmi,pfc.yaml

Signed-off-by: Oleksii Moisieiev <[email protected]>
    @oleksiimoisieiev
    oleksiimoisieiev committed Dec 1, 2021
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