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The upstream Linux kernel relies on the sunxi_sram driver to bind the
system-control nodes as syscon devices. Since U-Boot lacks this SRAM
driver, peripheral drivers may fail to resolve the syscon node unless an
explicit "syscon" compatible is added into the device tree.
To address this, add a bare UCLASS_SYSCON driver that matches all
Allwinner system-control and SRAM controller compatibles listed in the
Linux kernel to provide the necessary regmap access to the system
controller.
Signed-off-by: Junhui Liu <[email protected]>
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