linux-kernel - Re: [PATCH v5 00/18] Enable upper layers using FPGA region w/o device tree

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Date:   Wed, 15 Nov 2017 07:53:24 -0800
From:   Moritz Fischer <mdf@...nel.org>
To:     Alan Tull <atull@...nel.org>
Cc:     Moritz Fischer <mdf@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Subject: Re: [PATCH v5 00/18] Enable upper layers using FPGA region w/o
 device tree

On Tue, Oct 17, 2017 at 04:20:13PM -0500, Alan Tull wrote:
> * Change the fpga-mgr API to have one fpga_mgr_load function
>   instead of three.
> 
> * Separate common FPGA region code from Device Tree support
> 
> * Expose API functions for FPGA regions
> 
> * Add API functions for bridges where DT is not used.
> 
> * clean up drivers/fpga/Kconfig
> 
> * add attribute groups when registering a fpga manager, bridge, or region.
> 
> Needed because the current FPGA layer has a couple of problems:
> 
> * We now have 3 functions for programming a FPGA, depending on whether
> the image is in a sg list, a buffer, or firmware.  So upper layers
> have to be written assuming where the image will be or will have to
> write extra code to maintain flexibility.
> 
> * users who aren't using device tree are left to write their
> own code that is essentially a rewrite of FPGA region.
> 
> v5 changes are small:
> * add back in fpga_mgr_put in of_fpga_region_remove
> * make __fpga_bridge_get static
> * move #ifndef before #includes in headers
> * Spelling fixes and other nits
> 
> Alan Tull (18):
>   fpga: bridge: support getting bridge from device
>   fpga: mgr: API change to replace fpga load functions with single
>     function
>   fpga: mgr: separate getting/locking FPGA manager
>   fpga: region: use dev_err instead of pr_err
>   fpga: region: remove unneeded of_node_get and put
>   fpga: region: get mgr early on
>   fpga: region: check for child regions before allocing image info
>   fpga: region: fix slow warning with more than one overlay
>   fpga: region: use image info as parameter for programming region
>   fpga: region: separate out code that parses the overlay
>   fpga: region: add fpga-region.h header
>   fpga: region: rename some functions prior to moving
>   fpga: region: add register/unregister functions
>   fpga: region: add fpga_region_class_find
>   fpga: region: move device tree support to of-fpga-region.c
>   fpga: of-fpga-region: accept overlays that don't program FPGA
>   fpga: clean up fpga Kconfig
>   fpga: add attribute groups

Anyways, feel free to add my Acked-by's to the series. I have tried to /
done my change with bridge locking on top of this, but it became quickly
ugly. Let's get this stuff merged, and I'll try with a follow up patch.

> 
>  Documentation/fpga/fpga-mgr.txt    | 132 +++++-----
>  Documentation/fpga/fpga-region.txt |  95 +++++++
>  Documentation/fpga/overview.txt    |  23 ++
>  drivers/fpga/Kconfig               | 103 ++++----
>  drivers/fpga/Makefile              |   1 +
>  drivers/fpga/fpga-bridge.c         | 111 +++++++--
>  drivers/fpga/fpga-mgr.c            | 121 +++++++--
>  drivers/fpga/fpga-region.c         | 464 ++++------------------------------
>  drivers/fpga/of-fpga-region.c      | 497 +++++++++++++++++++++++++++++++++++++
>  include/linux/fpga/fpga-bridge.h   |  15 +-
>  include/linux/fpga/fpga-mgr.h      |  39 ++-
>  include/linux/fpga/fpga-region.h   |  40 +++
>  12 files changed, 1044 insertions(+), 597 deletions(-)
>  create mode 100644 Documentation/fpga/fpga-region.txt
>  create mode 100644 Documentation/fpga/overview.txt
>  create mode 100644 drivers/fpga/of-fpga-region.c
>  create mode 100644 include/linux/fpga/fpga-region.h
> 
> -- 
> 2.7.4
> 
Thanks,

Moritz