[PATCH v5 0/4] tty/serial: meson_uart: add support for core clock handling
narmstrong at baylibre.com
Mon Jun 19 01:43:05 PDT 2017
On 06/14/2017 10:29 AM, Neil Armstrong wrote:
> This patchset is a re-spin of Helmut Klein's v3 patchset at  and the v4 patchset at .
> Initially, the original patchset was made to enable usage on the non-AO UARTS
> not enabled by the Bootloader (uart_B and uart_C), but the patchset needed
> an overall change to have clean and stable DT bindings.
> The Amlogic Meson UART Driver did not have stable DT bindings and mismatched
> clock handling on non-AO UARTs since these "EE" UARTs needs a clock gate to
> be ungated to works correctly.
> In the same way, the AO UARTs does not need gating and can be used as
> Early Consoles.
> In the same time, the UART Interfaces can take clock input for the baudrate
> generate from either the external Xtal or the internal Bus Clock (clk81).
> So new bindings was necessary to meet these requirements and the DT
> maintainers requirements.
> The "legacy" binding actually used in the driver is left until all the DT
> files are switched to the new bindings.
> The GX DT has been tested, but the last 4 Meson6/Meson8/b are only
> compile-tested, and testing is welcome.
> Thus only the first 3 patches can be merged until the Meson6/Meson8/b are
> formally tested.
> It must be noted that the meson6 cannot work today except using an early
> console since the UART driver could not probe without a clocks property.
> Changes since v4 at :
> - Droped meson8/meson8b DT patches
> - Fixes copy/paste error in patch 2
> - Refactored clock probing in patch 2
> - merged meson6 patches together to avoid breaking bisect
>  http://firstname.lastname@example.org
>  http://email@example.com
> Helmut Klein (3):
> dt-bindings: serial: Add bindings for the Amlogic Meson UARTs
> tty/serial: meson_uart: update to stable bindings
> ARM64: dts: meson-gx: use stable UART bindings with correct gate clock
> Neil Armstrong (1):
> ARM: dts: meson6: use stable UART bindings
> .../bindings/serial/amlogic,meson-uart.txt | 38 +++++++++
> arch/arm/boot/dts/meson.dtsi | 8 +-
> arch/arm/boot/dts/meson6.dtsi | 28 +++++++
> arch/arm64/boot/dts/amlogic/meson-gx.dtsi | 12 ++-
> arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 25 ++++++
> arch/arm64/boot/dts/amlogic/meson-gxl.dtsi | 25 ++++++
> drivers/tty/serial/meson_uart.c | 90 ++++++++++++++++++++--
> 7 files changed, 209 insertions(+), 17 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/serial/amlogic,meson-uart.txt
Patches 3 & 4 will need a respin to avoid breaking compatibility with old kernel
like the tty patch does by keeping the legacy compatible string.
I will re-send then in a separate thread and Kevin will handle them.
Patches 1 & 2 can be taken if they are OK for you.
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