linux-kernel - [PATCH 0/2] ARM: dts: bcm-mobile: Split out nodes used by both BCM21664 and BCM23550

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Date: Wed, 05 Jun 2024 08:40:11 +0200
From: Artur Weber <aweber.kernel@...il.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Florian Fainelli <florian.fainelli@...adcom.com>, 
 Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Stanislav Jakubek <stano.jakubek@...il.com>, 
 ~postmarketos/upstreaming@...ts.sr.ht, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Artur Weber <aweber.kernel@...il.com>
Subject: [PATCH 0/2] ARM: dts: bcm-mobile: Split out nodes used by both
 BCM21664 and BCM23550

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, bcm21664-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!). It's worth noting though that some
bcm23550 compatibles now go unused, since the bcm21664-common.dtsi
file uses bcm21664 compatibles.

[1] https://github.com/knuxdroid/android_kernel_samsung_baffinlite

Signed-off-by: Artur Weber <aweber.kernel@...il.com>
---
Artur Weber (2):
      ARM: dts: broadcom: bcm21664: Move chosen node into bcm21664-garnet DTS
      ARM: dts: bcm-mobile: Split out nodes used by both BCM21664 and BCM23550

 arch/arm/boot/dts/broadcom/bcm21664-common.dtsi | 334 ++++++++++++++++++++++
 arch/arm/boot/dts/broadcom/bcm21664-garnet.dts  |   4 +
 arch/arm/boot/dts/broadcom/bcm21664.dtsi        | 326 +---------------------
 arch/arm/boot/dts/broadcom/bcm23550.dtsi        | 354 +-----------------------
 4 files changed, 357 insertions(+), 661 deletions(-)
---
base-commit: a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6
change-id: 20240528-bcm21664-common-14064864a4a7

Best regards,
-- 
Artur Weber <aweber.kernel@...il.com>