The following linker failure can be seen for a certain heavily reduced
defconfig:
drivers/soc/sunxi/sunxi_sram.o: In function `sunxi_sram_probe':
drivers/soc/sunxi/sunxi_sram.c:353: undefined reference to 
`__devm_regmap_init_mmio_clk'
drivers/soc/sunxi/sunxi_sram.c:353:(.text+0x3c4): relocation truncated to fit: 
R_AARCH64_CALL26 against undefined symbol `__devm_regmap_init_mmio_clk'

It would seem that the sunxi sram driver implicitly depended on config
REGMAP_MMIO.

To solve, select config REGMAP_MMIO for ARCH_SUNXI. This seems a better
option than selecting from the respective driver config as this just
defaults to ARCH_SUNXI.

Fixes: 5828729bebbb ("soc: sunxi: export a regmap for EMAC clock reg on A64")
Signed-off-by: John Garry <john.ga...@huawei.com>

diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index 51bc479..c8a6ad3 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms
@@ -12,6 +12,7 @@ config ARCH_SUNXI
        select ARCH_HAS_RESET_CONTROLLER
        select GENERIC_IRQ_CHIP
        select PINCTRL
+       select REGMAP_MMIO
        select RESET_CONTROLLER
        help
          This enables support for Allwinner sunxi based SoCs like the A64.
-- 
1.9.1

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