Em Sun, 18 Jul 2021 11:59:16 +0200
Mauro Carvalho Chehab [off-list ref] escreveu:

Em Thu, 15 Jul 2021 11:23:37 -0600
Rob Herring [off-list ref] escreveu:

quoted

On Tue, Jul 13, 2021 at 01:17:51PM +0200, Mauro Carvalho Chehab wrote:  

quoted

Currently, the designware schema is defined on a text file:
	designware-pcie.txt

Convert the pci-bus part into a schema.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 .../devicetree/bindings/pci/snps,dw-pcie.yaml | 96 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 97 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml

diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
new file mode 100644
index 000000000000..fd372d715ab4
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml

@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/snps,dw-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys DesignWare PCIe interface
+
+maintainers:
+  - Jingoo Han <jingoohan1@gmail.com>
+  - Gustavo Pimentel <gustavo.pimentel@synopsys.com>
+
+description: |
+  Synopsys DesignWare PCIe host controller
+
+allOf:
+  - $ref: /schemas/pci/pci-bus.yaml#
+
+properties:
+  compatible:
+    anyOf:
+      - {}
+      - const: snps,dw-pcie
+
+  reg:
+    description: |
+      It should contain Data Bus Interface (dbi) and config registers for all
+      versions.
+      For designware core version >= 4.80, it may contain ATU address space.
+    minItems: 2
+    maxItems: 4
+
+  reg-names:
+    minItems: 2
+    maxItems: 4
+    items:
+      enum: [dbi, dbi2, config, atu, addr_space, app, elbi, mgmt]    

Isn't 'config' only for host and 'addr_space' only for endpoint?  

The problem on enforcing an enum here is that severa *.dts files violate it. 
In the specific case of 'addr_space', there is (are?) place(s) where the wrong
compatible was used, like on arch/arm/boot/dts/artpec6.dtsi:

	pcie: pcie@f8050000 {
		compatible = "axis,artpec6-pcie", "snps,dw-pcie";
		reg = <0xf8050000 0x2000
		       0xf8040000 0x1000
		       0xc0000000 0x2000>;
		reg-names = "dbi", "phy", "config";
		#address-cells = <3>;
		#size-cells = <2>;
		device_type = "pci";
			  /* downstream I/O */
		ranges = <0x81000000 0 0 0xc0002000 0 0x00010000
			  /* non-prefetchable memory */
			  0x82000000 0 0xc0012000 0xc0012000 0 0x1ffee000>;
		num-lanes = <2>;
		bus-range = <0x00 0xff>;
		interrupts = <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
		interrupt-names = "msi";
		#interrupt-cells = <1>;
		interrupt-map-mask = <0 0 0 0x7>;
		interrupt-map = <0 0 0 1 &intc GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>,
				<0 0 0 2 &intc GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>,
				<0 0 0 3 &intc GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>,
				<0 0 0 4 &intc GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
		axis,syscon-pcie = <&syscon>;
		status = "disabled";
	};

	pcie_ep: pcie_ep@f8050000 {
		compatible = "axis,artpec6-pcie-ep", "snps,dw-pcie";
		reg = <0xf8050000 0x2000
		       0xf8051000 0x2000
		       0xf8040000 0x1000
		       0xc0000000 0x20000000>;
		reg-names = "dbi", "dbi2", "phy", "addr_space";
		num-ib-windows = <6>;
		num-ob-windows = <2>;
		num-lanes = <2>;
		axis,syscon-pcie = <&syscon>;
		status = "disabled";
	};

(funny enough, this is not generating warnings here).

Btw, besides the above, there are some DTS that use something different
from what's there at the enum:


	$ make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 dtbs_check 2>&1 |tee dtbs_check.log
	$ grep "\['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt'\]" dtbs_check.log|sed "s,From schema:,,"|cut -d: -f 2-|cut -d' ' -f 4-|sort|uniq -c|sort -n -r
	     51 'ctrl' is not one of ['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt']
	     44 'parf' is not one of ['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt']
	     18 'cfg' is not one of ['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt']
	      4 'link' is not one of ['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt']

In order to use an enum and not having warnings, the enum should be 
instead:

	reg-names:
	  minItems: 2
	  maxItems: 4
	  items:
	    enum: [dbi, dbi2, config, atu, app, elbi, mgmt, ctrl, parf, cfg, link] 

Actually, some reg definitions have 5 items.

I'm sending an updated patch series.

Thanks,
Mauro