diff mbox series

[DO,NOT,MERGE,v6,22/37] dt-bindings: display: smi,sm501: SMI SM501 binding json-schema

Message ID 9c3a9caaa1e2fc7e515cac67f07a20af071bd1be.1704788539.git.ysato@users.sourceforge.jp
State New
Headers show
Series Device Tree support for SH7751 based board | expand

Commit Message

Yoshinori Sato Jan. 9, 2024, 8:23 a.m. UTC 
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
 .../bindings/display/smi,sm501.yaml           | 417 ++++++++++++++++++
 1 file changed, 417 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/smi,sm501.yaml

Comments

Geert Uytterhoeven Jan. 15, 2024, 9:52 a.m. UTC | #1 
Hi Sato-san,

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

Thanks for your patch!

> ---
>  .../bindings/display/smi,sm501.yaml           | 417 ++++++++++++++++++
>  1 file changed, 417 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/smi,sm501.yaml

Surely Documentation/devicetree/bindings/display/sm501fb.txt should
be removed, too?

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/smi,sm501.yaml

> +  crt:
> +    type: object
> +    description: CRT output control
> +    properties:
> +      edid:
> +        $ref: /schemas/types.yaml#/definitions/uint8-array
> +        description: |
> +          verbatim EDID data block describing attached display.
> +          Data from the detailed timing descriptor will be used to
> +          program the display controller.
> +
> +      smi,flags:
> +        $ref: /schemas/types.yaml#/definitions/string-array
> +        description: Display control flags.
> +        items:
> +          anyOf:
> +            - const: use-init-done
> +            - const: disable-at-exit
> +            - const: use-hwcursor
> +            - const: use-hwaccel

The "use-*" flags look like software policy, not hardware description,
and thus do not belong in DT?

> +            - const: panel-no-fpen
> +            - const: panel-no-vbiasen
> +            - const: panel-inv-fpen
> +            - const: panel-inv-vbiasen
> +        maxItems: 8
> +
> +      bpp:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Color depth
> +
> +  panel:
> +    type: object
> +    description: Panel output control
> +    properties:
> +      edid:
> +        $ref: /schemas/types.yaml#/definitions/uint8-array
> +        description: |
> +          verbatim EDID data block describing attached display.
> +          Data from the detailed timing descriptor will be used to
> +          program the display controller.
> +
> +      smi,flags:
> +        $ref: /schemas/types.yaml#/definitions/string-array
> +        description: Display control flags.
> +        items:
> +          anyOf:
> +            - const: use-init-done
> +            - const: disable-at-exit
> +            - const: use-hwcursor
> +            - const: use-hwaccel

The "use-*" flags look like software policy, not hardware description,
and thus do not belong in DT?

> +            - const: panel-no-fpen
> +            - const: panel-no-vbiasen
> +            - const: panel-inv-fpen
> +            - const: panel-inv-vbiasen
> +        maxItems: 8
> +
> +      bpp:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Color depth
> +
> +  smi,devices:
> +    $ref: /schemas/types.yaml#/definitions/string-array
> +    description: Select SM501 device functions.
> +    items:
> +      anyOf:
> +        - const: usb-host
> +        - const: usb-slave
> +        - const: ssp0
> +        - const: ssp1
> +        - const: uart0
> +        - const: uart1
> +        - const: fbaccel
> +        - const: ac97
> +        - const: i2s
> +        - const: gpio
> +    minItems: 1
> +    maxItems: 10

I think it would be better to have individual subnodes for the sub devices,
with status = "ok"/"disabled".

If you go that route, you do need some fallback code to handle the lack
of subnodes in the existing user in arch/powerpc/boot/dts/charon.dts.

BTW, why can sm501_pci_initdata get away with setting ".devices
= SM501_USE_ALL"?  Or, would it hurt to enable all subdevices
unconditionally?

> +
> +  smi,mclk:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: mclk frequency.
> +
> +  smi,m1xclk:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: m1xclk frequency.

These two should be clock specifiers (i.e. phandles pointing to clock
nodes + optional clock indices).

> +
> +  misc-timing:
> +    type: object
> +    description: Miscellaneous Timing register values.
> +    properties:
> +      ex:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Extend bus holding time.
> +        enum: [0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240]
> +
> +      xc:
> +        $ref: /schemas/types.yaml#/definitions/string
> +        description: Xscale clock input select.
> +        items:
> +          enum:
> +            - internal-pll
> +            - hclk
> +            - gpio33

Software policy instead of hardware description again?

I am not familiar with how the SM501 works, so I cannot comment on
the other properties, but several of them look like they need rework.

Gr{oetje,eeting}s,

                        Geert
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/display/smi,sm501.yaml b/Documentation/devicetree/bindings/display/smi,sm501.yaml
new file mode 100644
index 000000000000..8f2767bf2193
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/smi,sm501.yaml
@@ -0,0 +1,417 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/smi,sm501.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Silicon Motion SM501 Mobile Multimedia Companion Chip
+
+maintainers:
+  - Yoshinori Sato <ysato@user.sourceforge.jp>
+
+description: |
+  These DT bindings describe the SM501.
+
+properties:
+  compatible:
+    const:
+      smi,sm501
+
+  reg:
+    maxItems: 2
+    description: |
+     First entry: System Configuration register
+     Second entry: IO space (Display Controller register)
+
+  interrupts:
+    description: SM501 interrupt to the cpu should be described here.
+
+  mode:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: select a video mode
+
+  edid:
+    description: |
+      verbatim EDID data block describing attached display.
+      Data from the detailed timing descriptor will be used to
+      program the display controller.
+
+  little-endian:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: available on big endian systems, to set different foreign endian.
+  big-endian:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: available on little endian systems, to set different foreign endian.
+
+  swap-fb-endian:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: swap framebuffer byteorder.
+
+  route-crt-panel:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: Panel output merge to CRT.
+
+  crt:
+    type: object
+    description: CRT output control
+    properties:
+      edid:
+        $ref: /schemas/types.yaml#/definitions/uint8-array
+        description: |
+          verbatim EDID data block describing attached display.
+          Data from the detailed timing descriptor will be used to
+          program the display controller.
+
+      smi,flags:
+        $ref: /schemas/types.yaml#/definitions/string-array
+        description: Display control flags.
+        items:
+          anyOf:
+            - const: use-init-done
+            - const: disable-at-exit
+            - const: use-hwcursor
+            - const: use-hwaccel
+            - const: panel-no-fpen
+            - const: panel-no-vbiasen
+            - const: panel-inv-fpen
+            - const: panel-inv-vbiasen
+        maxItems: 8
+
+      bpp:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Color depth
+
+  panel:
+    type: object
+    description: Panel output control
+    properties:
+      edid:
+        $ref: /schemas/types.yaml#/definitions/uint8-array
+        description: |
+          verbatim EDID data block describing attached display.
+          Data from the detailed timing descriptor will be used to
+          program the display controller.
+
+      smi,flags:
+        $ref: /schemas/types.yaml#/definitions/string-array
+        description: Display control flags.
+        items:
+          anyOf:
+            - const: use-init-done
+            - const: disable-at-exit
+            - const: use-hwcursor
+            - const: use-hwaccel
+            - const: panel-no-fpen
+            - const: panel-no-vbiasen
+            - const: panel-inv-fpen
+            - const: panel-inv-vbiasen
+        maxItems: 8
+
+      bpp:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Color depth
+
+  smi,devices:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description: Select SM501 device functions.
+    items:
+      anyOf:
+        - const: usb-host
+        - const: usb-slave
+        - const: ssp0
+        - const: ssp1
+        - const: uart0
+        - const: uart1
+        - const: fbaccel
+        - const: ac97
+        - const: i2s
+        - const: gpio
+    minItems: 1
+    maxItems: 10
+
+  smi,mclk:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: mclk frequency.
+
+  smi,m1xclk:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: m1xclk frequency.
+
+  misc-timing:
+    type: object
+    description: Miscellaneous Timing register values.
+    properties:
+      ex:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Extend bus holding time.
+        enum: [0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240]
+
+      xc:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: Xscale clock input select.
+        items:
+          enum:
+            - internal-pll
+            - hclk
+            - gpio33
+
+      us:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: USB host current detection.
+        items:
+          enum:
+            - disable
+            - enable
+
+      ssm1:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: SDRAM clock select for PW mode 1.
+        items:
+          enum:
+            - 288mhz
+            - div
+
+      sm1:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: SDRAM clock divider for PW mode 1.
+        enum: [1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 384]
+
+      ssm0:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: SDRAM clock select for PW mode 0.
+        items:
+          enum:
+            - 288mhz
+            - div
+
+      sm0:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: SDRAM clock divider for PW mode 0.
+        enum: [1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 384]
+
+      deb:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: 96MHz PLL debug control.
+        items:
+          enum:
+            - input-reference
+            - output
+
+      acpi:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: ACPI control.
+        items:
+          enum:
+            - disable
+            - enable
+
+      divider:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Second PLL output frequency.
+        enum: [336, 288, 240, 192]
+
+      usb-mode:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: USB Host mode.
+        items:
+          enum:
+            - normal
+            - simulation
+
+      delay:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Delay time to latch read data. Set the value to 10x.
+        enum: [5, 10, 15, 20, 25]
+
+  misc-control:
+    type: object
+    description: Miscellaneous Control register values.
+    properties:
+      pad:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: PCI Pad drive strength.
+        enum: [24, 12, 8]
+
+      usbclk:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: USB Clcok Select.
+        items:
+          enum:
+            - crystal
+            - 96mhz
+            - 48mhz
+
+      uart-ssp:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: UART1/SSP1 select.
+        items:
+          enum:
+            - uart1
+            - ssp1
+
+      lat:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: 8051 Latch enable.
+        items:
+          enum:
+            - disable
+            - enable
+
+      fp:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Flat Panel data select.
+        enum: [18, 24]
+
+      freq:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Frequency select.
+        enum: [24, 12]
+
+      refresh:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Internal memory refresh timing.
+        enum: [8, 16, 32, 64]
+
+      hold:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: BUS Hold time.
+        enum: [0, 8, 16, 24, 32]
+
+      sh:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: SuperH ready polarity.
+        items:
+          enum:
+            - active-low
+            - active-high
+
+      ii:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: Interrupt Inverting.
+        items:
+          enum:
+            - normal
+            - invert
+
+      pll:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: PLL clock count.
+        items:
+          enum:
+            - disable
+            - enable
+
+      gap:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: DAC Band GAP control.
+        items:
+          const: default
+
+      dac:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: DAC Power control.
+        items:
+          enum:
+            - disable
+            - enable
+
+      mc:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: USB slave controller.
+        items:
+          enum:
+            - cpu
+            - '8051'
+
+      bl:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: CPU Master burst length.
+        enum: [8, 1]
+
+      usb:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: USB port select.
+        items:
+          enum:
+            - master
+            - slave
+
+      lb:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: USB loop-back select.
+        items:
+          enum:
+            - normal
+            - loopback
+      vr:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: NEC VR Memory map select.
+        enum: [30, 62]
+
+  gpio-pin-control:
+    type: object
+    description: GPIO control configuration.
+    properties:
+      pin:
+        type: object
+        properties:
+          gpio:
+            $ref: /schemas/types.yaml#/definitions/flag
+            description: pin in/out use GPIO.
+          function:
+            $ref: /schemas/types.yaml#/definitions/flag
+            description: pin in/out use function.
+
+  gpio-i2c:
+    type: object
+    description: GPIO I2C definition.
+    properties:
+      i2c:
+        type: object
+        properties:
+          bus:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            description: I2C bus number.
+
+          sda:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            description: I2C SDA pin port number.
+
+          scl:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            description: I2C SCL pin port number.
+
+          delay:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            description: bit transmission delay.
+
+          timeout:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            description: transmission timeout.
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+
+examples:
+  # MPC5200
+  - |
+    display@1,0 {
+        compatible = "smi,sm501";
+        reg = <0x00000000 0x00800000
+               0x03e00000 0x00200000>;
+        interrupts = <1 1 3>;
+        mode = "640x480-32@60";
+        edid = [00 ff ff ff ff ff ff 00 00 00 00 00 00 00 00 00
+                00 00 01 04 00 00 00 00 00 00 00 00 00 00 00 00
+                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+                00 00 00 00 00 00 f0 0a 80 fb 20 e0 25 10 32 60
+                02 00 00 00 00 00 00 06 00 00 00 00 00 00 00 00
+                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 bd];
+    };