Re: [linux-yocto] [kernel v5.2/standard/xlnx-soc][PATCH 2/2] arch: arm64: dts: add overlay dts file

[Quanyang Wang]

On 10/14/19 2:05 PM, Michal Simek wrote:
On 13. 10. 19 15:33, quanyang.w...@windriver.com wrote:
From: MengLi <meng...@windriver.com>
Add overlay dts file for updating FPGA bitstream file on
zynqmp platform.

Signed-off-by: Meng Li <meng...@windriver.com>
Signed-off-by: Quanyang Wang <quanyang.w...@windriver.com>
---
  arch/arm64/boot/dts/xilinx/Makefile            |  1 +
  .../dts/xilinx/zynqmp-zcu102-fpga-update.dts   | 18 ++++++++++++++++++
  2 files changed, 19 insertions(+)
  create mode 100644 arch/arm64/boot/dts/xilinx/zynqmp-zcu102-fpga-update.dts

diff --git a/arch/arm64/boot/dts/xilinx/Makefile 
b/arch/arm64/boot/dts/xilinx/Makefile
index bec4746fe721..d56c449988d0 100644
--- a/arch/arm64/boot/dts/xilinx/Makefile
+++ b/arch/arm64/boot/dts/xilinx/Makefile
@@ -13,6 +13,7 @@ dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu100-revC.dtb
  dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu102-revA.dtb
  dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu102-revB.dtb
  dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu102-rev1.0.dtb
+dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu102-fpga-update.dtb
  dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu104-revA.dtb
  dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu104-revC.dtb
  dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu106-revA.dtb
diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-zcu102-fpga-update.dts 
b/arch/arm64/boot/dts/xilinx/zynqmp-zcu102-fpga-update.dts
new file mode 100644
index 000000000000..f1e1506b6210
--- /dev/null
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-zcu102-fpga-update.dts
@@ -0,0 +1,18 @@
+// overlay dts file.
+/dts-v1/;
+/plugin/;
+
+/ {
+       fragment@0 {
+               target-path = "/fpga-full";
+               #address-cells = <1>;
+               #size-cells = <1>;
+
+               __overlay__ {
+                       #address-cells = <2>;
+                       #size-cells = <2>;
+
+                       firmware-name = "system.bit.bin";
+               };
+       };
+};

I understand what you want to do but not sure why you think that this is
the best way how to do it.

Hi Michal,

This patch is based on the url:

https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841847/Solution+ZynqMP+PL+Programming#x-Programming+the+PL+through+Linux

"FPGA programming using Device Tree Overlay (DTO)".

We will describe how to programming FPGA by using 2 methods in README 
for our customer:

one is FPGA programming using sysfs attributes 
<https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841847/Solution+ZynqMP+PL+Programming#SolutionZynqMPPLProgramming-FPGAprogrammingusingsysfsattributes>

And the other is FPGA programming using Device Tree Overlay (DTO) 
<https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841847/Solution+ZynqMP+PL+Programming#SolutionZynqMPPLProgramming-FPGAprogrammingusingDeviceTreeOverlay(DTO)>

This patch is used for the second method.

Is there any better way to do it?

Thanks,

Quanyang



Thanks,
Michal

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