linux-kernel - Re: [RFC PATCH 1/6] Documentation: arm: ti: Add bindings for AM654 SoC

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Date:   Tue, 12 Jun 2018 15:05:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Nishanth Menon <nm@...com>
Cc:     Santosh Shilimkar <ssantosh@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Tony Lindgren <tony@...mide.com>, Vignesh R <vigneshr@...com>,
        Tero Kristo <t-kristo@...com>,
        Russell King <linux@...linux.org.uk>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [RFC PATCH 1/6] Documentation: arm: ti: Add bindings for AM654
 SoC

On Tue, Jun 05, 2018 at 01:01:20AM -0500, Nishanth Menon wrote:
> The AM654 SoC is a lead device of the K3 Multicore SoC architecture
> platform, targeted for broad market and industrial control with aim to
> meet the complex processing needs of modern embedded products.
> 
> Some highlights of this SoC are:
> * Quad ARMv8 A53 cores split over two clusters
> * GICv3 compliant GIC500
> * Configurable L3 Cache and IO-coherent architecture
> * Dual lock-step capable R5F uC for safety-critical applications
> * High data throughput capable distributed DMA architecture under NAVSS
> * Three Gigabit Industrial Communication Subsystems (ICSSG), each with dual
>   PRUs and dual RTUs
> * Hardware accelerator block containing AES/DES/SHA/MD5 called SA2UL
> * Centralized System Controller for Security, Power, and Resource
>   management.
> * Dual ADCSS, eQEP/eCAP, eHRPWM, dual CAN-FD
> * Flash subystem with OSPI and Hyperbus interfaces
> * Multimedia capability with CAL, DSS7-UL, SGX544, McASP
> * Peripheral connectivity including USB3, PCIE, MMC/SD, GPMC, I2C, SPI,
>   GPIO
> 
> See AM65x Technical Reference Manual (SPRUID7, April 2018)
> for further details: http://www.ti.com/lit/pdf/spruid7
> 
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
>  Documentation/devicetree/bindings/arm/ti/k3.txt | 33 +++++++++++++++++++++++++
>  MAINTAINERS                                     |  7 ++++++
>  2 files changed, 40 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/ti/k3.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/ti/k3.txt b/Documentation/devicetree/bindings/arm/ti/k3.txt
> new file mode 100644
> index 000000000000..cbabb1b89f6f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/ti/k3.txt
> @@ -0,0 +1,33 @@
> +Texas Instruments K3 Multicore SoC architecture device tree bindings
> +--------------------------------------------------------------------
> +
> +Boards based on K3 Multicore SoC architecture shall have the following property:
> +- compatible: Every hardware block introduced in K3 Multicore SoC
> +  architecture shall be of the form:
> +  "ti,XXX-YYY", where:
> +     'XXX' represents the specific SoC part for which the support is added.
> +     'YYY' represents the corresponding peripheral in SoC being supported.

No need to explain standard DT convention here. (But I don't think we 
have this convention documented anywhere, so patches welcome. :))

> +
> +  NOTE: Generic devices such as GIC or legacy devices shall use the specified
> +  compatible for those devices.
> +
> +  Example:
> +    compatible = "ti,am654-i2c";
> +
> +SoCs
> +-------------------------------------------
> +
> +Each device tree root node must specify which exact SoC in K3 Multicore SoC
> +architecture it uses, using one of the following compatible values:
> +
> +- AM654
> +  compatible = "ti,am654";
> +
> +Boards
> +-------------------------------------------
> +
> +In addition, each device tree root node must specify which one or more
> +of the following board-specific compatible values:
> +
> +- AM654 EVM
> +  compatible = "ti,am654-evm", "ti,am654";
> diff --git a/MAINTAINERS b/MAINTAINERS
> index f39a8de1bbd7..cfb35b252ac7 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2086,6 +2086,13 @@ L:	linux-kernel@...r.kernel.org
>  S:	Maintained
>  F:	drivers/memory/*emif*
>  
> +ARM/TEXAS INSTRUMENTS K3 ARCHITECTURE
> +M:	Tero Kristo <t-kristo@...com>
> +M:	Nishanth Menon <nm@...com>
> +L:	linux-arm-kernel@...ts.infradead.org (moderated for non-subscribers)
> +S:	Supported
> +F:	Documentation/devicetree/bindings/arm/ti/k3.txt
> +
>  ARM/TEXAS INSTRUMENT KEYSTONE ARCHITECTURE
>  M:	Santosh Shilimkar <ssantosh@...nel.org>
>  L:	linux-arm-kernel@...ts.infradead.org (moderated for non-subscribers)
> -- 
> 2.15.1
>