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d526f340f7
Add the power domain DM driver for i.MX8, that it depends on the DTB power domain trees to generate the power domain provider devices. Users need to add power domain trees with property "compatible = "nxp,imx8-pd";" When power on a PD device, the driver will power on its ancestor PD devices in power domain tree. When power off a PD device, the driver will check its child PD devices first. Only if all child PD devices are off, then power off the current PD device. Then the driver checks sibling PD devices. If sibling PD devices are off, then it will power off parent PD device. There is no counter maintained in this driver, but a state to hold current on/off state. So the request and free functions are empty. The power domain implementation in i.MX8 DTB set the "#power-domain-cells" to 0, so there is no ID binding with each PD device. We don't use "id" variable in struct power_domain. At the same time, we have to set of_xlate to empty to bypass standard of_xlate in uclass driver. Signed-off-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Anatolij Gustschin <agust@denx.de> Cc: Stefano Babic <sbabic@denx.de> |
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