[00/11] Add PRU-ICSS nodes on AM335x, AM437x & AM57xx SoCs

Hi Tony,

The following series adds the DT nodes for the Programmable Real-Time
Unit and Industrial Communication Subsystems (PRU-ICSS or simply PRUSS)
present on certain AM335x, AM437x and all AM57xx SoCs. For details, please
refer to the respective Technical Reference Manuals [1][2][3] or the cover
letter from the first foundation PRUSS platform driver [4]. The next-gen
ICSSG nodes were already mainlined for K3 AM65x and J721E SoCs.

The sub-system is represented through multiple platform device nodes
which are supported through a corresponding platform driver, like the
PRUSS platform driver, PRUSS irqchip driver and a PRU remoteproc driver
(upstreamed in 5.10, 5.11 kernels). This series adds the foundation PRUSS
nodes, that can in turn be referenced and used by PRU client/application
drivers. The client bindings and driver changes were posted previously
and need a refresh [5][6], but won't affect these nodes.

The PRU-ICSS is not supported on every device in the AM335x and AM437x
SoC family. It is only supported on AM3356+ and AM4376+ SoCs. All AM57xx
SoCs (but not DRA7xx SoCs) support PRU-ICSS. I have taken slightly different
approaches in the patches for each of the SoC families:
 - AM57xx PRU-ICSS target modules are already cleanly separated in
   am57-pruss.dtsi, so the nodes are directly added in enabled state.
 - AM437x PRUSS nodes are directly added and enabled in the am4372.dtsi,
   as all the existing AM437x board dts files use AM4376+ SoCs.
 - AM335x PRUSS nodes are also added in the common am33xx-l4.dtsi file,
   and the parent ti-sysc target-module is enabled only in the required
   board dts files. There are about 35 different AM335x board dts files,
   with many of them using AM3352. I couldn't identify exactly what SoC
   version is being used for some of them, so the PRU-ICSS nodes are
   enabled only on known TI boards.
 - MDIO nodes are currently disabled, they will be enabled after the PRU
   Ethernet driver is upstreamed.

Patches are on top of 5.14-rc3 (should apply cleanly on 5.14-rc1 as
well), as I had to use that version due to some Ethernet issues for NFS.

Let me know if you prefer the AM57 style of a separate dtsi file for
PRUSS, and I can repost these quickly.

regards
Suman

[1] AM335x TRM Rev.Q: https://www.ti.com/lit/pdf/spruh73
[2] AM437x TRM Rev.I: https://www.ti.com/lit/pdf/spruhl7
[3] AM571x TRM Rev.I: https://www.ti.com/lit/pdf/spruhz7
[4] https://patchwork.kernel.org/project/linux-arm-kernel/cover/1596020528-19510-1-git-send-email-grzegorz.jaszczyk@linaro.org/
[5] https://patchwork.kernel.org/project/linux-remoteproc/cover/20201216165239.2744-1-grzegorz.jaszczyk@linaro.org/
[6] https://patchwork.kernel.org/project/linux-remoteproc/cover/20201211184811.6490-1-grzegorz.jaszczyk@linaro.org/

Andrew F. Davis (1):
  ARM: dts: am4372: Add PRUSS MDIO controller node

Suman Anna (10):
  ARM: dts: am33xx-l4: Add PRUSS node
  ARM: dts: am33xx-l4: Add PRUSS MDIO controller node
  ARM: dts: am335x-bone-common: Enable PRU-ICSS node
  ARM: dts: am335x-evm: Enable PRU-ICSS module
  ARM: dts: am335x-evmsk: Enable PRU-ICSS module
  ARM: dts: am335x-icev2: Enable PRU-ICSS module
  ARM: dts: am4372: Add the PRU-ICSS1 DT node
  ARM: dts: am4372: Add the PRU-ICSS0 DT node
  ARM: dts: am57xx: Add PRU-ICSS nodes
  ARM: dts: am57xx: Add PRUSS MDIO controller nodes

 arch/arm/boot/dts/am335x-bone-common.dtsi     |   4 +
 arch/arm/boot/dts/am335x-evm.dts              |   4 +
 arch/arm/boot/dts/am335x-evmsk.dts            |   4 +
 arch/arm/boot/dts/am335x-icev2.dts            |   4 +
 arch/arm/boot/dts/am33xx-l4.dtsi              |  82 ++++++++
 arch/arm/boot/dts/am4372.dtsi                 | 165 ++++++++++++++++
 arch/arm/boot/dts/am437x-cm-t43.dts           |   4 +
 arch/arm/boot/dts/am437x-gp-evm.dts           |   4 +
 arch/arm/boot/dts/am437x-idk-evm.dts          |   4 +
 arch/arm/boot/dts/am437x-sk-evm.dts           |   4 +
 arch/arm/boot/dts/am43x-epos-evm.dts          |   4 +
 arch/arm/boot/dts/am57-pruss.dtsi             | 178 +++++++++++++++++-
 arch/arm/boot/dts/am571x-idk.dts              |   8 +
 arch/arm/boot/dts/am572x-idk.dts              |   8 +
 arch/arm/boot/dts/am574x-idk.dts              |   8 +
 .../boot/dts/am57xx-beagle-x15-common.dtsi    |   8 +
 arch/arm/boot/dts/am57xx-cl-som-am57x.dts     |   8 +
 17 files changed, 500 insertions(+), 1 deletion(-)