[PATCH v3 1/4] dt-bindings: pinctrl: spacemit: add support for K1 SoC

Yixun Lan
2024-08-28T11:31:21Z

Add dt-bindings for the pinctrl driver of SpacemiT's K1 SoC.

Signed-off-by: Yixun Lan <dlan@gentoo.org>
---
Changes in v3:
- drop spacemit,slew-rate-{enable,disable} property
- use drive-strength instead of drive-strength-microamp
- fold strong-pull-up into bias-pull-up
- format fixed
- title fixed
---
.../bindings/pinctrl/spacemit,k1-pinctrl.yaml | 127 +++++++++++++++++++++
1 file changed, 127 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/spacemit,k1-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/spacemit,k1-pinctrl.yaml
new file mode 100644
index 0000000000000..166e529b54b27
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/spacemit,k1-pinctrl.yaml
@@ -0,0 +1,127 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/spacemit,k1-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT K1 SoC Pin Controller
+
+maintainers:
+ - Yixun Lan <dlan@gentoo.org>
+
+properties:
+ compatible:
+ const: spacemit,k1-pinctrl
+
+ reg:
+ items:
+ - description: pinctrl io memory base
+
+patternProperties:
+ '-cfg$':
+ type: object
+ additionalProperties: false
+
+ description:
+ A pinctrl node should contain at least one subnode representing the
+ pinctrl groups available on the machine.
+
+ patternProperties:
+ '-pins$':
+ type: object
+ additionalProperties: false
+
+ description:
+ Each subnode will list the pins it needs, and how they should
+ be configured, with regard to muxer configuration, bias pull,
+ drive strength, input schmitt trigger, slew rate, power source.
+
+ allOf:
+ - $ref: pincfg-node.yaml#
+ - $ref: pinmux-node.yaml#
+
+ properties:
+ pinmux:
+ description:
+ The list of GPIOs and their mux settings that properties in the
+ node apply to. This should be set using the K1_PADCONF macro to
+ construct the value.
+
+ bias-disable: true
+
+ bias-pull-down: true
+
+ bias-pull-up:
+ description: |
+ typical value for selecting bias pull up or strong pull up.
+ 0: normal bias pull up
+ 1: strong bias pull up
+ enum: [ 0, 1 ]
+
+ drive-strength:
+ description: |
+ typical current when output high level.
+ 1.8V output: 11, 21, 32, 42 (mA)
+ 3.3V output: 7, 10, 13, 16, 19, 23, 26, 29 (mA)
+
+ input-schmitt:
+ description: |
+ typical threshold for schmitt trigger.
+ 0: buffer mode
+ 1: trigger mode
+ 2, 3: trigger mode
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [ 0, 1, 2, 3 ]
+
+ power-source:
+ description: external power supplies at 1.8v or 3.3v.
+ enum: [ 1800, 3300 ]
+
+ slew-rate:
+ description: |
+ slew rate for output buffer.
+ 0: disable it
+ 1: enable it (via bundled value from drive strength)
+ 2: slow speed 0
+ 3: slow speed 1
+ 4: medium speed
+ 5: fast speed
+ enum: [ 0, 1, 2, 3, 4, 5 ]
+
+ required:
+ - pinmux
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ #define GPIO_68 69
+ #define GPIO_69 70
+
+ #define K1_PADCONF(pin, func) (((pin) << 16) | (func))
+
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ pinctrl@d401e000 {
+ compatible = "spacemit,k1-pinctrl";
+ reg = <0x0 0xd401e000 0x0 0x400>;
+
+ uart0_2_cfg: uart0-2-cfg {
+ uart0-2-pins {
+ pinmux = <K1_PADCONF(GPIO_68, 2)>,
+ <K1_PADCONF(GPIO_69, 2)>;
+
+ bias-pull-up = <0>;
+ drive-strength = <32>;
+ };
+ };
+ };
+ };
+
+...

--
2.45.2