The BCM21664 and BCM23550 are nearly identical to each other in terms
of register layout. This was verified against a downstream kernel[1] -
Broadcom's kernel has "RDB" directories which includes headers with
the full register maps for the included hardware. Running:
diff --recursive arch/arm/mach-{hawaii,java}/include/mach/rdb
reveals that the differences are minuscule - some things related to
ISP and H264 decoding. Most of the other differences are related to
the different CPUs in the two chipsets - the BCM21664 has 2x Cortex-A9
cores, and the BCM23550 has 4x Cortex-A7 cores.
In mainline, most drivers are also re-used between the two.
To make development for both platforms easier, split out the common
nodes into a separate DTSI, bcm2166x-common.dtsi. This only leaves
the device-specific nodes - so, CPU and related things - in the SoC-
specific DTSIs (bcm21664.dtsi and bcm23550.dtsi).
The new DTSI is based off the bcm23550.dtsi, with its split into
busses. Since it's pretty much 99% identical, I kept the licensing
of the original file (BSD 3-clause). The license for the bcm21664.dtsi
file remains GPL 2.0 as it originally was.
make CHECK_DTBS=y on bcm21664-garnet.dtb and bcm23550-sparrow.dtb
seem to pass fine for me (thanks to Stanislav Jakubek for converting
the bindings to YAML format!).
[1] https://github.com/knuxdroid/android_kernel_samsung_baffinlite
Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
---
Changes in v2:
- Renamed bcm21664-common.dtsi to bcm2166x-common.dtsi
- Dropped model/compatible from SoC DTSIs
- Moved apps bus peripherals in SoC DTSIs under "&apps"
- Re-added SoC-specific compatibles into SoC DTSIs
- Fixed warning regarding address in GIC node name
- Link to v1: https://lore.kernel.org/lkml/20240605-bcm21664-common-v1-0-6386e9141eb6@gmail.com/
---
Artur Weber (2):
ARM: dts: broadcom: bcm21664: Move chosen node into Garnet DTS
ARM: dts: bcm-mobile: Split out nodes used by both BCM21664 and BCM23550
arch/arm/boot/dts/broadcom/bcm21664-garnet.dts | 4 +
arch/arm/boot/dts/broadcom/bcm21664.dtsi | 342 ++-----------------
.../{bcm23550.dtsi => bcm2166x-common.dtsi} | 111 +------
arch/arm/boot/dts/broadcom/bcm23550.dtsi | 370 ++-------------------
4 files changed, 77 insertions(+), 750 deletions(-)
---
base-commit: a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6
change-id: 20240528-bcm21664-common-14064864a4a7
Best regards,
--
Artur Weber <aweber.kernel@gmail.com>