Re: [PATCH v4 2/4] fpga: xilinx: reorganize to subdir layout

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Jun 14, 2021 at 01:16:46PM -0700, trix@redhat.com wrote:
> From: Tom Rix <trix@redhat.com>
> 
> Follow drivers/net/ethernet/ which has control configs
> NET_VENDOR_BLA that map to drivers/net/ethernet/bla
> Since fpgas do not have many vendors, drop the 'VENDOR' and use
> FPGA_BLA.
> 
> There are several new subdirs
> altera/
> dfl/
> lattice/
> xilinx/
> 
> Each subdir has a Kconfig that has a new/reused
> 
> if FPGA_BLA
>   ... existing configs ...
> endif FPGA_BLA
> 
> Which is sourced into the main fpga/Kconfig
> 
> Each subdir has a Makefile whose transversal is controlled in the
> fpga/Makefile by
> 
> obj-$(CONFIG_FPGA_BLA) += bla/
> 
> This is the xilinx/ subdir part
> 
> Create a xilinx/ subdir
> Move xilinx-* and zynq* files to it.
> Add a Kconfig and Makefile
> 
> Signed-off-by: Tom Rix <trix@redhat.com>
> ---
>  drivers/fpga/Kconfig                          | 40 +-------------
>  drivers/fpga/Makefile                         |  5 +-
>  drivers/fpga/xilinx/Kconfig                   | 55 +++++++++++++++++++
>  drivers/fpga/xilinx/Makefile                  |  6 ++
>  .../fpga/{ => xilinx}/xilinx-pr-decoupler.c   |  0
>  drivers/fpga/{ => xilinx}/xilinx-spi.c        |  0
>  drivers/fpga/{ => xilinx}/zynq-fpga.c         |  0
>  drivers/fpga/{ => xilinx}/zynqmp-fpga.c       |  0
>  8 files changed, 63 insertions(+), 43 deletions(-)
>  create mode 100644 drivers/fpga/xilinx/Kconfig
>  create mode 100644 drivers/fpga/xilinx/Makefile
>  rename drivers/fpga/{ => xilinx}/xilinx-pr-decoupler.c (100%)
>  rename drivers/fpga/{ => xilinx}/xilinx-spi.c (100%)
>  rename drivers/fpga/{ => xilinx}/zynq-fpga.c (100%)
>  rename drivers/fpga/{ => xilinx}/zynqmp-fpga.c (100%)
> 
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 7a290b2234576..28c261807b428 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -52,25 +52,12 @@ config FPGA_MGR_ALTERA_CVP
>  	  FPGA manager driver support for Arria-V, Cyclone-V, Stratix-V,
>  	  Arria 10 and Stratix10 Altera FPGAs using the CvP interface over PCIe.
>  
> -config FPGA_MGR_ZYNQ_FPGA
> -	tristate "Xilinx Zynq FPGA"
> -	depends on ARCH_ZYNQ || COMPILE_TEST
> -	help
> -	  FPGA manager driver support for Xilinx Zynq FPGAs.
> -
>  config FPGA_MGR_STRATIX10_SOC
>  	tristate "Intel Stratix10 SoC FPGA Manager"
>  	depends on (ARCH_INTEL_SOCFPGA && INTEL_STRATIX10_SERVICE)
>  	help
>  	  FPGA manager driver support for the Intel Stratix10 SoC.
>  
> -config FPGA_MGR_XILINX_SPI
> -	tristate "Xilinx Configuration over Slave Serial (SPI)"
> -	depends on SPI
> -	help
> -	  FPGA manager driver support for Xilinx FPGA configuration
> -	  over slave serial interface.
> -
>  config FPGA_MGR_ICE40_SPI
>  	tristate "Lattice iCE40 SPI"
>  	depends on OF && SPI
> @@ -113,23 +100,6 @@ config ALTERA_FREEZE_BRIDGE
>  	  isolate one region of the FPGA from the busses while that
>  	  region is being reprogrammed.
>  
> -config XILINX_PR_DECOUPLER
> -	tristate "Xilinx LogiCORE PR Decoupler"
> -	depends on FPGA_BRIDGE
> -	depends on HAS_IOMEM
> -	help
> -	  Say Y to enable drivers for Xilinx LogiCORE PR Decoupler
> -	  or Xilinx Dynamic Function eXchnage AIX Shutdown Manager.
> -	  The PR Decoupler exists in the FPGA fabric to isolate one
> -	  region of the FPGA from the busses while that region is
> -	  being reprogrammed during partial reconfig.
> -	  The Dynamic Function eXchange AXI shutdown manager prevents
> -	  AXI traffic from passing through the bridge. The controller
> -	  safely handles AXI4MM and AXI4-Lite interfaces on a
> -	  Reconfigurable Partition when it is undergoing dynamic
> -	  reconfiguration, preventing the system deadlock that can
> -	  occur if AXI transactions are interrupted by DFX.
> -
>  config FPGA_REGION
>  	tristate "FPGA Region"
>  	depends on FPGA_BRIDGE
> @@ -146,14 +116,6 @@ config OF_FPGA_REGION
>  	  overlay.
>  
>  source "drivers/fpga/dfl/Kconfig"
> -
> -config FPGA_MGR_ZYNQMP_FPGA
> -	tristate "Xilinx ZynqMP FPGA"
> -	depends on ZYNQMP_FIRMWARE || (!ZYNQMP_FIRMWARE && COMPILE_TEST)
> -	help
> -	  FPGA manager driver support for Xilinx ZynqMP FPGAs.
> -	  This driver uses the processor configuration port(PCAP)
> -	  to configure the programmable logic(PL) through PS
> -	  on ZynqMP SoC.
> +source "drivers/fpga/xilinx/Kconfig"
>  
>  endif # FPGA
> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> index bda74e54ce390..0868c7c4264d8 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -15,9 +15,6 @@ obj-$(CONFIG_FPGA_MGR_SOCFPGA)		+= socfpga.o
>  obj-$(CONFIG_FPGA_MGR_SOCFPGA_A10)	+= socfpga-a10.o
>  obj-$(CONFIG_FPGA_MGR_STRATIX10_SOC)	+= stratix10-soc.o
>  obj-$(CONFIG_FPGA_MGR_TS73XX)		+= ts73xx-fpga.o
> -obj-$(CONFIG_FPGA_MGR_XILINX_SPI)	+= xilinx-spi.o
> -obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)	+= zynq-fpga.o
> -obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA)	+= zynqmp-fpga.o
>  obj-$(CONFIG_ALTERA_PR_IP_CORE)         += altera-pr-ip-core.o
>  obj-$(CONFIG_ALTERA_PR_IP_CORE_PLAT)    += altera-pr-ip-core-plat.o
>  
> @@ -25,10 +22,10 @@ obj-$(CONFIG_ALTERA_PR_IP_CORE_PLAT)    += altera-pr-ip-core-plat.o
>  obj-$(CONFIG_FPGA_BRIDGE)		+= fpga-bridge.o
>  obj-$(CONFIG_SOCFPGA_FPGA_BRIDGE)	+= altera-hps2fpga.o altera-fpga2sdram.o
>  obj-$(CONFIG_ALTERA_FREEZE_BRIDGE)	+= altera-freeze-bridge.o
> -obj-$(CONFIG_XILINX_PR_DECOUPLER)	+= xilinx-pr-decoupler.o
>  
>  # High Level Interfaces
>  obj-$(CONFIG_FPGA_REGION)		+= fpga-region.o
>  obj-$(CONFIG_OF_FPGA_REGION)		+= of-fpga-region.o
>  
>  obj-$(CONFIG_FPGA_DFL) += dfl/
> +obj-$(CONFIG_FPGA_XILINX) += xilinx/
> diff --git a/drivers/fpga/xilinx/Kconfig b/drivers/fpga/xilinx/Kconfig
> new file mode 100644
> index 0000000000000..e016d450539a0
> --- /dev/null
> +++ b/drivers/fpga/xilinx/Kconfig
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +config FPGA_XILINX
> +	bool "Xilinx FPGAs"

"Xilinx FPGA drivers"

> +	default y
> +	help
> +	  If you have a xilinx fpga, say Y.

"Xilix FPGA"

But how about being a bit more descriptive here:

"Select this option if you want to enable support for Xilinx FPGA
drivers"

> +	  Note that the answer to this question doesn't directly affect the
> +	  kernel: saying N will just cause the configurator to skip all
> +	  the questions about xilinx fpgas. If you say Y, you will be asked
> +	  for your specific device in the following questions.

Why this "note"?  Do networking drivers have this type of description?

Same for the other patches in this series.

thanks,

greg k-h