On Mon, Jan 04, 2021 at 09:19:24AM -0800, Russ Weight wrote: > > > On 1/1/21 7:13 PM, Xu Yilun wrote: > > This patch adds description for UIO support for dfl devices on DFL > > bus. > > > > Signed-off-by: Xu Yilun <yilun.xu@xxxxxxxxx> > > --- > > v2: no doc in v1, add it for v2. > > v3: some documentation fixes. > > v4: documentation change since the driver matching is changed. > > v5: no change. > > --- > > Documentation/fpga/dfl.rst | 24 ++++++++++++++++++++++++ > > 1 file changed, 24 insertions(+) > > > > diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst > > index 0404fe6..b8497f3 100644 > > --- a/Documentation/fpga/dfl.rst > > +++ b/Documentation/fpga/dfl.rst > > @@ -7,6 +7,7 @@ Authors: > > - Enno Luebbers <enno.luebbers@xxxxxxxxx> > > - Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> > > - Wu Hao <hao.wu@xxxxxxxxx> > > +- Xu Yilun <yilun.xu@xxxxxxxxx> > > > > The Device Feature List (DFL) FPGA framework (and drivers according to > > this framework) hides the very details of low layer hardwares and provides > > @@ -502,6 +503,29 @@ FME Partial Reconfiguration Sub Feature driver (see drivers/fpga/dfl-fme-pr.c) > > could be a reference. > > > > > > +UIO support for DFL devices > > +=========================== > > +The purpose of an FPGA is to be reprogrammed with newly developed hardware > > +components. New hardware can instantiate a new private feature in the DFL, and > > +then get a DFL device in their system. In some cases users may need a userspace > > +driver for the DFL device: > > + > > +* Users may need to run some diagnostic test for their hardwares. > > +* Users may prototype the kernel driver in user space. > > +* Some hardware is designed for specific purposes and does not fit into one of > > + the standard kernel subsystems. > > + > > +This requires the direct access to the MMIO space and interrupt handling in > This may be better stated as: > > "This requires direct access to MMIO space and interrupt handling from userspace." Thanks for the correction, I'll change it. Yilun
