• Thomas Petazzoni's avatar
    arm: add documentation describing Marvell families of SoC · 9ee99783
    Thomas Petazzoni authored
    As stated in the introduction of the document, the families of ARM
    SoCs at Marvell are very complicated, and it is difficult for
    newcomers to understand the organization of this SoC family and how it
    relates to the Linux kernel support for those hardware platforms.
    
    This document is only at RFC stage for now, it requires reviews and
    comments from the Marvell maintainers, the PXA maintainers and the MMP
    maintainers. For correctness of course, but also to add any other
    information that would be useful. For example, one of the thing that
    wasn't clear how to detail in the documentation is how the SoCs relate
    to each other in terms of hardware IP blocks. For example, most of the
    Kirkwood/Dove/Armada 370-XP/etc. hardware IPs (I2C, SPI, USB, SATA,
    etc.) are identical, while the PXA and MMP families are completely
    separate.
    Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
    Cc: Andrew Lunn <andrew@lunn.ch>
    Cc: Jason Cooper <jason@lakedaemon.net>
    Cc: Gregory Clement <gregory.clement@free-electrons.com>
    Cc: Eric Miao <eric.y.miao@gmail.com>
    Cc: Russell King <linux@arm.linux.org.uk>
    Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
    Cc: Nicolas Pitre <nico@fluxnic.net>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Olof Johansson <olof@lixom.net>
    Cc: Lior Amsalem <alior@marvell.com>
    Cc: Maen Suleiman <maen@marvell.com>
    Cc: Tawfik Bayouk <tawfik@marvell.com>
    Cc: Shadi Ammouri <shadi@marvell.com>
    Cc: Eran Ben-Avi <benavi@marvell.com>
    Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
    
    ---
    Changes from v3:
     * Add Arnd Bergmann Acked-by.
    
    Changes from v2:
     * Mention the plat-<foo> directory that each SoC family is using.
     * Take into account Eric Miao's comments on the PXA/MMP families: add
       PXA21x/PXA25x/PXA26x to the list, mention which processors are
       AP+CP or AP only. Clarify the comments on which SoCs were designed
       by Intel, which ones were designed by Marvell after the acquisition
       of the XScale family.
     * Mention long-term plans regarding the support of those SoC
       families.
    
    Changes from v1:
     * Added publicly available datasheet for the 88F5182 pointed by
       Andrew Lunn.
     * Added publicly available datasheet for the 88F5281 found with
       Google searches
     * Mentionned the Feroceon core name where appropriate, and Sheeva
       where appropriate
     * Fixed the core names for PXA930, PXA935 and PXA955 after comments
       from Arnd Bergmann. Wikipedia is mistakenly suggesting that PXA93x
       are Sheeva-based, and there isn't much information available on the
       web about the 955.
    9ee99783
README 11.3 KB