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

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Message-ID: <2a64dcb7-d79e-7ef8-b3e6-4c2533a19c38@oracle.com>
Date:   Thu, 20 Aug 2020 09:27:08 -0700
From:   santosh.shilimkar@...cle.com
To:     Suman Anna <s-anna@...com>,
        Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>,
        ssantosh@...nel.org, Tony Lindgren <tony@...mide.com>
Cc:     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

On 8/20/20 7:43 AM, Suman Anna wrote:
> 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.
> 
No just post V2 addressing Rob's comment. I will line it up once
rob acks it.

Regards,
Santosh