linux-kernel - Re: [PATCH 0/6] Add TI PRUSS platform driver

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Message-ID: <12a7fc2a-4c48-655f-daa1-880fd1866fd1@ti.com>
Date:   Thu, 20 Aug 2020 09:43:14 -0500
From:   Suman Anna <s-anna@...com>
To:     Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>,
        <ssantosh@...nel.org>, Tony Lindgren <tony@...mide.com>
CC:     <santosh.shilimkar@...cle.com>, <robh+dt@...nel.org>,
        <lee.jones@...aro.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <praneeth@...com>
Subject: Re: [PATCH 0/6] Add TI PRUSS platform driver

Hi Santosh, Tony,

On 7/29/20 6:02 AM, Grzegorz Jaszczyk wrote:
> Hi,
> 
> The Programmable Real-Time Unit and Industrial Communication Subsystem
> (PRU-ICSS) is present on various TI SoCs. The IP is present on multiple TI SoC
> architecture families including the OMAP architecture SoCs such as AM33xx,
> AM437x and AM57xx; and on a Keystone 2 architecture based 66AK2G SoC. It is also
> present on the Davinci based OMAPL138 SoCs and K3 architecture based AM65x and
> J721E SoCs as well.
> 
> A PRUSS consists of dual 32-bit RISC cores (Programmable Real-Time Units, or
> PRUs), shared RAM, data and instruction RAMs, some internal peripheral modules
> to facilitate industrial communication, and an interrupt controller.
> 
> The programmable nature of the PRUs provide flexibility to implement custom
> peripheral interfaces, fast real-time responses, or specialized data handling.
> The common peripheral modules include the following,
>   - an Ethernet MII_RT module with two MII ports
>   - an MDIO port to control external Ethernet PHYs
>   - an Industrial Ethernet Peripheral (IEP) to manage/generate Industrial
>     Ethernet functions
>   - an Enhanced Capture Module (eCAP)
>   - an Industrial Ethernet Timer with 7/9 capture and 16 compare events
>   - a 16550-compatible UART to support PROFIBUS
>   - Enhanced GPIO with async capture and serial support
> 
> 
> A typical usage scenario would be to load the application firmware into one or
> more of the PRU cores, initialize one or more of the peripherals and perform I/O
> through shared RAM from either a kernel driver or directly from userspace.
> 
> This series contains the PRUSS platform driver. This is the parent driver for
> the entire PRUSS and is used for managing the subsystem level resources like
> various memories and the CFG module.  It is responsible for the creation and
> deletion of the platform devices for the child PRU devices and other child
> devices (like Interrupt Controller, MDIO node and some syscon nodes) so that
> they can be managed by specific platform drivers.
> 
> Grzegorz Jaszczyk (1):
>   dt-bindings: soc: ti: Add TI PRUSS bindings
> 
> Suman Anna (5):
>   soc: ti: pruss: Add a platform driver for PRUSS in TI SoCs
>   soc: ti: pruss: Add support for PRU-ICSSs on AM437x SoCs
>   soc: ti: pruss: Add support for PRU-ICSS subsystems on AM57xx SoCs
>   soc: ti: pruss: Add support for PRU-ICSS subsystems on 66AK2G SoC
>   soc: ti: pruss: enable support for ICSSG subsystems on K3 AM65x SoCs

Do you have any comments on the driver portions of this series before Greg posts
a v2 addressing the binding comments. This is one of the foundation series
towards enabling PRUSS, and is a dependency for the PRU remoteproc driver.

regards
Suman

> 
>  .../devicetree/bindings/soc/ti/ti,pruss.yaml       | 383 +++++++++++++++++++++
>  drivers/soc/ti/Kconfig                             |  11 +
>  drivers/soc/ti/Makefile                            |   1 +
>  drivers/soc/ti/pruss.c                             | 183 ++++++++++
>  include/linux/pruss_driver.h                       |  48 +++
>  5 files changed, 626 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml
>  create mode 100644 drivers/soc/ti/pruss.c
>  create mode 100644 include/linux/pruss_driver.h
>