linux-kernel - Re: [PATCH] ARM: at91/Documentation: add a README for Atmel SoCs

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Message-ID: <20150113113657.GB3843@piout.net>
Date:	Tue, 13 Jan 2015 12:36:57 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	khilman@...nel.org,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Patrice Vilchez <patrice.vilchez@...el.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Cyrille Pitchen <cyrille.pitchen@...el.com>,
	ARM Maintainers <arm@...nel.org>
Subject: Re: [PATCH] ARM: at91/Documentation: add a README for Atmel SoCs

On 13/01/2015 at 12:26:04 +0100, Nicolas Ferre wrote :
> Le 09/01/2015 14:20, Nicolas Ferre a écrit :
> > Add a README file to describe Atmel SoCs (aka AT91) support in Mainline Linux:
> > - SoC list + datasheet web links
> > - Basic but useful information
> > - Device Tree conventions and Work In Progress statement.
> > 
> > Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> > Cc: ARM Maintainers <arm@...nel.org>
> > ---
> >  Documentation/arm/Atmel/README | 120 +++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 120 insertions(+)
> >  create mode 100644 Documentation/arm/Atmel/README
> > 
> > diff --git a/Documentation/arm/Atmel/README b/Documentation/arm/Atmel/README
> > new file mode 100644
> > index 000000000000..538f8a556277
> > --- /dev/null
> > +++ b/Documentation/arm/Atmel/README
> > @@ -0,0 +1,120 @@
> > +ARM Atmel SoCs (aka AT91)
> > +=========================
> > +
> > +
> > +Introduction
> > +------------
> > +This document gives useful information about the ARM Atmel SoCs that are
> > +currently supported in Linux Mainline (you know, the one on kernel.org).
> > +
> > +It is important to note that the Atmel | SMART ARM-based MPU product line is
> > +historically named "AT91" or "at91" throughout the Linux kernel development
> > +process even if this product prefix has completely disappeared from the
> > +official Atmel product name. Anyway, files, directories, git trees,
> > +git branches/tags and email subject always contain this "at91" sub-string.
> > +
> > +
> > +AT91 SoCs
> > +---------
> > +Documentation and detailled datasheet for each product are available on
> > +the Atmel website: http://www.atmel.com.
> > +
> > +  Flavors:
> > +    * ARM 920 based SoC
> > +      - at91rm9200
> > +        + Datasheet
> > +          http://www.atmel.com/Images/doc1768.pdf
> > +
> > +    * ARM 926 based SoCs
> > +      - at91sam9260
> > +        + Datasheet
> > +          http://www.atmel.com/Images/doc6221.pdf
> > +

at91sam9xe is still supported, the datasheet is there:
http://www.atmel.com/Images/Atmel-6254-32-bit-ARM926EJ-S-Embedded-Microprocessor-SAM9XE_Datasheet.pdf

> > +      - at91sam9261
> > +        + Datasheet
> > +          http://www.atmel.com/Images/doc6062.pdf
> > +
> > +      - at91sam9263
> > +        + Datasheet
> > +          http://www.atmel.com/Images/Atmel_6249_32-bit-ARM926EJ-S-Microcontroller_SAM9263_Datasheet.pdf
> > +
> > +      - at91sam9rl
> > +        + Datasheet
> > +          http://www.atmel.com/Images/doc6289.pdf
> > +
> > +      - at91sam9g20
> > +        + Datasheet
> > +          http://www.atmel.com/Images/doc6384.pdf
> > +
> > +      - at91sam9g45 family
> > +        - at91sam9g45
> > +        - at91sam9g46
> > +        - at91sam9m10
> > +        - at91sam9m11 (device superset)
> > +        + Datasheet
> > +          http://www.atmel.com/Images/Atmel-6437-32-bit-ARM926-Embedded-Microprocessor-SAM9M11_Datasheet.pdf
> > +
> > +      - at91sam9x5 family (aka "The 5 series")
> > +        - at91sam9g15
> > +        - at91sam9g25
> > +        - at91sam9g35
> > +        - at91sam9x25
> > +        - at91sam9x35
> > +        + Datasheet (can be considered as covering the whole family)
> > +          http://www.atmel.com/Images/Atmel_11055_32-bit-ARM926EJ-S-Microcontroller_SAM9X35_Datasheet.pdf
> > +
> > +      - at91sam9n12
> > +        + Datasheet
> > +          http://www.atmel.com/Images/Atmel_11063_32-bit-ARM926EJ-S-Microcontroller_SAM9N12CN11CN12_Datasheet.pdf
> > +
> > +    * ARM Cortex-A5 based SoCs
> > +      - sama5d3 family
> > +        - sama5d31
> > +        - sama5d33
> > +        - sama5d34
> > +        - sama5d35
> > +        - sama5d36 (device superset)
> > +        + Datasheet
> > +          http://www.atmel.com/Images/Atmel-11121-32-bit-Cortex-A5-Microcontroller-SAMA5D3_Datasheet.pdf
> > +
> > +    * ARM Cortex-A5 + NEON based SoCs
> > +      - sama5d4 family
> > +        - sama5d41
> > +        - sama5d42
> > +        - sama5d43
> > +        - sama5d44 (device superset)
> > +        + Datasheet
> > +          http://www.atmel.com/Images/Atmel-11238-32-bit-Cortex-A5-Microcontroller-SAMA5D4_Datasheet.pdf
> > +
> > +
> > +Linux kernel information
> > +------------------------
> > +Linux kernel mach directory: arch/arm/mach-at91
> > +MAINTAINERS entry is: "ARM/ATMEL AT91RM9200 AND AT91SAM ARM ARCHITECTURES"
> > +
> > +
> > +Device Tree for AT91 SoCs and boards
> > +------------------------------------
> > +All AT91 SoCs are converted to Device Tree. Since Linux 3.19, these products
> > +must use this method to boot the Linux kernel.
> > +
> > +Work In Progress statement:
> > +Device Tree files and Device Tree bindings that apply to AT91 SoCs and boards are
> > +considered as "Unstable". To be completely clear, any at91 binding can change at
> > +any time. So, be sure to use a Device Tree Binary and a Kernel Image generated from
> > +the same source tree.
> > +Please refer to the Documentation/devicetree/bindings/ABI.txt file for a
> > +definition of a "Stable" binding/ABI.
> > +This statement will be removed by AT91 MAINTAINERS when appropriated.
> > +
> > +Naming conventions and best practice:
> > +- SoCs Device Tree Source Include files are named after the official name of
> > +  the product (at91sam9g20.dtsi or sama5d33.dtsi for instance).
> > +- Device Tree Source Include files (.dtsi) are used to collect common nodes that can be
> > +  shared across SoCs or boards (sama5d3.dtsi or at91sam9x5cm.dtsi for instance).
> > +  When collecting nodes for a particular peripheral or topic, the identifier have to
> > +  be placed at the end of the file name, separated with a "_" (at91sam9x5_can.dtsi
> > +  or sama5d3_gmac.dtsi for example).
> > +- board Device Tree Source files (.dts) are prefixed by the string "at91-" so
> > +  that they can be identified easily. Note that the sama5d3[13456]ek.dts files
> > +  are an historical exception to this rule.
> 
> In fact, this set of boards are not the only exception. I will rephrase
> the sentence as:
> "Note that some files are historical exceptions to this rule
> (sama5d3[13456]ek.dts, usb_a9g20.dts or animeo_ip.dts for example)."
> 
> Bye,
> -- 
> Nicolas Ferre

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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