Subject: Re: [PATCH V3 0/8] ARM: Add minimal Raspberry Pi 4 support

From: Florian Fainelli <[email-masked]>
Date: Sat, 28 Sep 2019 13:01:55 -0700

On 9/28/2019 5:07 AM, Stefan Wahren wrote:
> This series adds minimal support for the new Raspberry Pi 4, so we are able
> to login via debug UART.
> 
> Patch 1-2:   Fix some DT schema warnings
> Patch 3-4:   Prepare DTS for the new SoC BMC2711
> Patch 5-7:   Add Raspberry Pi 4 DTS support
> Patch 8:     Update MAINTAINERS
> 
> Unfortunately the Raspberry Pi Foundation didn't released a
> peripheral documentation for the new SoC yet. So we only have a preliminary
> datasheet [1] and reduced schematics [2].

Overall this looks good to me, just a few comments in specific patches,
if you can re-spin those patches we should try to get that in 5.5?

> 
> Known issues:
> Since Linux 5.3-rc1 DMA doesn't work properly on that platform.
> Nicolas Saenz Julienne investigates on that issue. As a temporary workaround
> i reverted the following patch to test this series:
> 
> 79a98672 "dma-mapping: remove dma_max_pfn"
> 7559d612 "mmc: core: let the dma map ops handle bouncing"
> 
> Changes in V3:
> - rebased series
> - add Reviewed-by
> - enable ARM_GIC for ARCH_BCM2835 on arm64 too
> - configure i2c pull-up in bcm2711.dtsi
> - move i2c2 to bcm2835-common.dtsi
> - add missing compatibles to DT schema as suggested by Rob
> - fix DT schema warnings in dtsi files
> - replace brcm pintrl with generic pinctrl as suggested by Linus
> - make dma_zone_size depend on CONFIG_ZONE_DMA as suggested by Matthias
> 
> Changes in V2:
> - use separate board file for BCM2711
> - enable ARM_GIC for ARCH_BCM2835
> - add Acked-by and Reviewed-by
> - fix arm-pmu and timer nodes for BCM2711 reported by Marc Zyngier
> - enable HDMI at board level
> - move HDMI and pixelvalve into bcm2835-common.dtsi as suggested by Eric Anholt
> - fix DWC2 probing warning by setting USB role to peripheral
> - fix order of node references in bcm2711.dtsi
> - disable I2C clock stretching quirk for BCM2711
> - mark PLLD_PER as critical clock
> - make PLLH clock unavailable on BCM2711
> - fix compile warning in clk-bcm2835 for arm64
> 
> Changes since RFC:
> - change BCM2838 -> BCM2711 as discussed in RFC
> - update MAINTAINERS accordingly
> - drop "spi: bcm2835: enable shared interrupt support" from series
> - squash all pinctrl-bcm2835 changes into one patch
> - introduce SoC specific clock registration as suggested by Florian
> - fix watchdog probing for Raspberry Pi 4
> - convert brcm,bcm2835.txt to json-schema
> - move VC4 node to bcm2835-common.dtsi
> - fallback to legacy pull config for Raspberry Pi 4
> - revert unintended change of mailbox in bcm283x.dtsi
> - add reference for arm64
> 
> [1] - https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711/rpi_DATA_2711_1p0_preliminary.pdf
> [2] - https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_4b_4p0_reduced.pdf
> 
> Stefan Wahren (8):
>   ARM: dts: bcm283x: Remove simple-bus from fixed clocks
>   ARM: dts: bcm283x: Remove brcm,bcm2835-pl011 compatible
>   ARM: dts: bcm283x: Move BCM2835/6/7 specific to bcm2835-common.dtsi
>   dt-bindings: arm: Convert BCM2835 board/soc bindings to json-schema
>   dt-bindings: arm: bcm2835: Add Raspberry Pi 4 to DT schema
>   ARM: bcm: Add support for BCM2711 SoC
>   ARM: dts: Add minimal Raspberry Pi 4 support
>   MAINTAINERS: Add BCM2711 to BCM2835 ARCH
> 
>  .../devicetree/bindings/arm/bcm/bcm2835.yaml       |  54 ++
>  .../devicetree/bindings/arm/bcm/brcm,bcm2835.txt   |  67 --
>  MAINTAINERS                                        |   3 +-
>  arch/arm/boot/dts/Makefile                         |   1 +
>  arch/arm/boot/dts/bcm2711-rpi-4-b.dts              | 121 +++
>  arch/arm/boot/dts/bcm2711.dtsi                     | 838 +++++++++++++++++++++
>  arch/arm/boot/dts/bcm2835-common.dtsi              | 194 +++++
>  arch/arm/boot/dts/bcm2835-rpi.dtsi                 |   4 -
>  arch/arm/boot/dts/bcm2835.dtsi                     |   1 +
>  arch/arm/boot/dts/bcm2836.dtsi                     |   1 +
>  arch/arm/boot/dts/bcm2837.dtsi                     |   1 +
>  arch/arm/boot/dts/bcm283x-rpi-usb-peripheral.dtsi  |   7 +
>  arch/arm/boot/dts/bcm283x.dtsi                     | 190 +----
>  arch/arm/mach-bcm/Kconfig                          |   3 +-
>  arch/arm/mach-bcm/Makefile                         |   3 +-
>  arch/arm/mach-bcm/bcm2711.c                        |  24 +
>  arch/arm64/Kconfig.platforms                       |   5 +-
>  17 files changed, 1257 insertions(+), 260 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/arm/bcm/bcm2835.yaml
>  delete mode 100644 Documentation/devicetree/bindings/arm/bcm/brcm,bcm2835.txt
>  create mode 100644 arch/arm/boot/dts/bcm2711-rpi-4-b.dts
>  create mode 100644 arch/arm/boot/dts/bcm2711.dtsi
>  create mode 100644 arch/arm/boot/dts/bcm2835-common.dtsi
>  create mode 100644 arch/arm/boot/dts/bcm283x-rpi-usb-peripheral.dtsi
>  create mode 100644 arch/arm/mach-bcm/bcm2711.c
> 
> --
> 2.7.4
> 

-- 
Florian

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