diff mbox series

[DO,NOT,MERGE,v6,12/37] dt-bindings: pci: pci-sh7751: Add SH7751 PCI

Message ID 160ee086771703c951c5522d997662aeac122a28.1704788539.git.ysato@users.sourceforge.jp (mailing list archive)
State New, archived
Headers show
Series Device Tree support for SH7751 based board | expand

Commit Message

Yoshinori Sato Jan. 9, 2024, 8:23 a.m. UTC
Renesas SH7751 PCI Controller json-schema.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
 .../bindings/pci/renesas,sh7751-pci.yaml      | 150 ++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/renesas,sh7751-pci.yaml

Comments

Linus Walleij Jan. 9, 2024, 12:42 p.m. UTC | #1
Hi Yoshinori,

thanks for your patch!

On Tue, Jan 9, 2024 at 9:24 AM Yoshinori Sato
<ysato@users.sourceforge.jp> wrote:

> Renesas SH7751 PCI Controller json-schema.
>
> Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
(...)
> +  renesas,bus-arbit-round-robin:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set DMA bus arbitration to round robin.
> +
> +  pci-command-reg-fast-back-to-back:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI command register Fast Back-to-Back enable bit.
> +
> +  pci-command-reg-serr:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI command register SERR# enable.
> +
> +  pci-command-reg-wait-cycle-control:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI command register Wait cycle control bit.
> +
> +  pci-command-reg-parity-error-response:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI Command register Parity error response bit.
> +
> +  pci-command-reg-vga-snoop:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI Command register VGA palette snoop bit.
> +
> +  pci-command-reg-write-invalidate:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI Command register Memory write and invaldate enable bit.
> +
> +  pci-command-reg-special-cycle:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI Command register Special cycle bit.
> +
> +  pci-command-reg-bus-master:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI Command register Bus master bit.
> +
> +  pci-command-reg-memory-space:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI Command register Memory space bit.
> +
> +  pci-command-reg-io-space:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Set for PCI Command register I/O space bit.

Do you really need to configure all these things? It seems they are
just set to default values anyway?

Can't you just look at the compatible "renesas,sh7751-pci" and
set it to the values you know are needed for that compatible?

> +  pci-bar:
> +    $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +    description: Overwrite to  PCI CONFIG Base Address Registers value.
> +    items:
> +      items:
> +        - description: BAR register number
> +        - description: BAR register value
> +    minItems: 1
> +    maxItems: 6

Same with this, isn't this always the same (hardcoded) values
for "renesas,sh7751-pci" if used?

> +            interrupt-map = <0x0000 0 0 1 &julianintc 5>,
> +                            <0x0000 0 0 2 &julianintc 6>,
> +                            <0x0000 0 0 3 &julianintc 7>,
> +                            <0x0000 0 0 4 &julianintc 8>,
> +                            <0x0800 0 0 1 &julianintc 6>,
> +                            <0x0800 0 0 2 &julianintc 7>,
> +                            <0x0800 0 0 3 &julianintc 8>,
> +                            <0x0800 0 0 4 &julianintc 5>,
> +                            <0x1000 0 0 1 &julianintc 7>,
> +                            <0x1000 0 0 2 &julianintc 8>,
> +                            <0x1000 0 0 3 &julianintc 5>,
> +                            <0x1000 0 0 4 &julianintc 6>;

This interrupt-map looks very strange, usually the last cell is the polarity
flag and here it is omitted? I would expect something like:

<0x0000 0 0 1 &julianintc 5 IRQ_TYPE_LEVEL_LOW>, (...)

The interrupt-map schema in dtschema isn't really looking at this
so it is easy to get it wrong.

Yours,
Linus Walleij
Rob Herring Jan. 9, 2024, 5:31 p.m. UTC | #2
On Tue, Jan 09, 2024 at 01:42:53PM +0100, Linus Walleij wrote:
> Hi Yoshinori,
> 
> thanks for your patch!
> 
> On Tue, Jan 9, 2024 at 9:24 AM Yoshinori Sato
> <ysato@users.sourceforge.jp> wrote:
> 
> > Renesas SH7751 PCI Controller json-schema.
> >
> > Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
> (...)
> > +  renesas,bus-arbit-round-robin:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set DMA bus arbitration to round robin.
> > +
> > +  pci-command-reg-fast-back-to-back:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI command register Fast Back-to-Back enable bit.
> > +
> > +  pci-command-reg-serr:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI command register SERR# enable.
> > +
> > +  pci-command-reg-wait-cycle-control:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI command register Wait cycle control bit.
> > +
> > +  pci-command-reg-parity-error-response:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI Command register Parity error response bit.
> > +
> > +  pci-command-reg-vga-snoop:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI Command register VGA palette snoop bit.
> > +
> > +  pci-command-reg-write-invalidate:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI Command register Memory write and invaldate enable bit.
> > +
> > +  pci-command-reg-special-cycle:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI Command register Special cycle bit.
> > +
> > +  pci-command-reg-bus-master:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI Command register Bus master bit.
> > +
> > +  pci-command-reg-memory-space:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI Command register Memory space bit.
> > +
> > +  pci-command-reg-io-space:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description: |
> > +      Set for PCI Command register I/O space bit.
> 
> Do you really need to configure all these things? It seems they are
> just set to default values anyway?
> 
> Can't you just look at the compatible "renesas,sh7751-pci" and
> set it to the values you know are needed for that compatible?

Yes. Please drop all these.

> 
> > +  pci-bar:
> > +    $ref: /schemas/types.yaml#/definitions/uint32-matrix
> > +    description: Overwrite to  PCI CONFIG Base Address Registers value.
> > +    items:
> > +      items:
> > +        - description: BAR register number
> > +        - description: BAR register value
> > +    minItems: 1
> > +    maxItems: 6
> 
> Same with this, isn't this always the same (hardcoded) values
> for "renesas,sh7751-pci" if used?

The OpenFirmware PCI bus supplement already defines how to specify BAR 
values in DT in "reg" or "assigned-addresses". If you need to specify 
these, use that. Note don't expect the kernel to do anything with them.

Rob

> 
> > +            interrupt-map = <0x0000 0 0 1 &julianintc 5>,
> > +                            <0x0000 0 0 2 &julianintc 6>,
> > +                            <0x0000 0 0 3 &julianintc 7>,
> > +                            <0x0000 0 0 4 &julianintc 8>,
> > +                            <0x0800 0 0 1 &julianintc 6>,
> > +                            <0x0800 0 0 2 &julianintc 7>,
> > +                            <0x0800 0 0 3 &julianintc 8>,
> > +                            <0x0800 0 0 4 &julianintc 5>,
> > +                            <0x1000 0 0 1 &julianintc 7>,
> > +                            <0x1000 0 0 2 &julianintc 8>,
> > +                            <0x1000 0 0 3 &julianintc 5>,
> > +                            <0x1000 0 0 4 &julianintc 6>;
> 
> This interrupt-map looks very strange, usually the last cell is the polarity
> flag and here it is omitted? I would expect something like:
> 
> <0x0000 0 0 1 &julianintc 5 IRQ_TYPE_LEVEL_LOW>, (...)
> 
> The interrupt-map schema in dtschema isn't really looking at this
> so it is easy to get it wrong.

dtc should IIRC. Maybe not in the example being incomplete.

Rob
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/pci/renesas,sh7751-pci.yaml b/Documentation/devicetree/bindings/pci/renesas,sh7751-pci.yaml
new file mode 100644
index 000000000000..45e5a19e7d0f
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/renesas,sh7751-pci.yaml
@@ -0,0 +1,150 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/renesas,sh7751-pci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas SH7751 PCI Host controller
+
+maintainers:
+  - Yoshinori Sato <ysato@users.sourceforge.jp>
+
+allOf:
+  - $ref: /schemas/pci/pci-bus.yaml#
+
+properties:
+  compatible:
+    const: renesas,sh7751-pci
+
+  reg:
+    minItems: 2
+    maxItems: 2
+
+  reg-names:
+    items:
+      - const: PCI Controller
+      - const: Bus State Controller
+
+  "#interrupt-cells":
+    const: 1
+
+  "#address-cells":
+    const: 3
+
+  "#size-cells":
+    const: 2
+
+  ranges: true
+
+  dma-ranges: true
+
+  interrupt-controller: true
+
+  renesas,bus-arbit-round-robin:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set DMA bus arbitration to round robin.
+
+  pci-command-reg-fast-back-to-back:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI command register Fast Back-to-Back enable bit.
+
+  pci-command-reg-serr:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI command register SERR# enable.
+
+  pci-command-reg-wait-cycle-control:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI command register Wait cycle control bit.
+
+  pci-command-reg-parity-error-response:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI Command register Parity error response bit.
+
+  pci-command-reg-vga-snoop:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI Command register VGA palette snoop bit.
+
+  pci-command-reg-write-invalidate:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI Command register Memory write and invaldate enable bit.
+
+  pci-command-reg-special-cycle:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI Command register Special cycle bit.
+
+  pci-command-reg-bus-master:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI Command register Bus master bit.
+
+  pci-command-reg-memory-space:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI Command register Memory space bit.
+
+  pci-command-reg-io-space:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Set for PCI Command register I/O space bit.
+
+  pci-bar:
+    $ref: /schemas/types.yaml#/definitions/uint32-matrix
+    description: Overwrite to  PCI CONFIG Base Address Registers value.
+    items:
+      items:
+        - description: BAR register number
+        - description: BAR register value
+    minItems: 1
+    maxItems: 6
+
+required:
+  - compatible
+  - reg
+  - "#interrupt-cells"
+  - "#address-cells"
+  - "#size-cells"
+  - ranges
+  - interrupt-map
+  - interrupt-map-mask
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    pci@fe200000 {
+            compatible = "renesas,sh7751-pci";
+            #address-cells = <3>;
+            #size-cells = <2>;
+            #interrupt-cells = <1>;
+            interrupt-controller;
+            device_type = "pci";
+            bus-range = <0 0>;
+            ranges = <0x02000000 0 0xfd000000 0xfd000000 0 0x01000000>,
+                     <0x01000000 0 0x00000000 0xfe240000 0 0x00040000>;
+            dma-ranges = <0x02000000 0 0xc000000 0x0c000000 0 0x04000000>;
+            reg = <0xfe200000 0x0400>,
+                  <0xff800000 0x0100>;
+            interrupt-map = <0x0000 0 0 1 &julianintc 5>,
+                            <0x0000 0 0 2 &julianintc 6>,
+                            <0x0000 0 0 3 &julianintc 7>,
+                            <0x0000 0 0 4 &julianintc 8>,
+                            <0x0800 0 0 1 &julianintc 6>,
+                            <0x0800 0 0 2 &julianintc 7>,
+                            <0x0800 0 0 3 &julianintc 8>,
+                            <0x0800 0 0 4 &julianintc 5>,
+                            <0x1000 0 0 1 &julianintc 7>,
+                            <0x1000 0 0 2 &julianintc 8>,
+                            <0x1000 0 0 3 &julianintc 5>,
+                            <0x1000 0 0 4 &julianintc 6>;
+            pci-bar = <0 0xab000001>, <2 0xd0000000>;
+            pci-command-reg-io-space;
+            interrupt-map-mask = <0x1800 0 0 7>;
+    };