arm64: dts: allwinner: h616: enable DVFS for all boards

With the DT bindings now describing the format of the CPU OPP tables, we
can include the OPP table in each board's .dts file, and specify the CPU
power supply.
This allows to enable DVFS, and get up to 50% of performance benefit in
the highest OPP, or up to 60% power savings in the lowest OPP, compared
to the fixed 1GHz @ 1.0V OPP we are running in by default at the moment.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

arm64: dts: allwinner: drop underscore in node names

Underscores should not be used in node names (dtc with W=2 warns about
them), so replace them with hyphens. Use also generic name for pwrseq
node, because generic naming is favored by Devicetree spec. All the
clocks affected by this change use clock-output-names, so resulting
clock name should not change. Functional impact checked with comparing
before/after DTBs with dtx_diff and fdtdump.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20240317184130.157695-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

arm64: dts: allwinner: Transpeed 8K618-T: add WiFi nodes

In contrast to other devices using Allwinner SoCs, the Transpeed 8K618-T
TV box uses a mainline supported WiFi chip: it's Broadcom 4335 compatible,
packaged by Murata.

Add the required DT nodes to let DT users know about the SDIO device.
There is an otherwise empty MMC device node, to receive the MAC address,
that firmware might want to write in there.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20240209115759.3582869-3-andre.przywara@arm.com
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

arm64: dts: allwinner: h618: add Transpeed 8K618-T TV box

This is a Chinese TV box, probably very similar if not identical to
various other cheap TV boxes with the same specs:
- Allwinner H618 SoC (4 * Arm Cortex-A53 cores, 1MB L2 cache)
- 2 or 4GiB DDR3L DRAM
- 32, 64, or 128 GiB eMMC flash
- AXP313a PMIC
- 100 Mbit/s Ethernet (using yet unsupported internal PHY)
- HDMI port
- 2 * USB 2.0 ports
- microSD card slot
- 3.5mm A/V port
- 7-segment display
- 5V barrel plug power supply

The PCB provides holes for soldering a UART header or cable, this is
connected to the debug UART0. UART1 is used for the Bluetooth chip,
although this isn't working yet.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20231214015312.17363-4-andre.przywara@arm.com
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>