Re: [PATCH 1/4] dt-bindings: input: add Qualcomm QPNP haptics driver

[Bjorn Andersson]

On Sat 12 Jun 15:54 CDT 2021, Caleb Connolly wrote:

> Add bindings for pmi8998 qpnp haptics driver.
> 
> Signed-off-by: Caleb Connolly <caleb@xxxxxxxxxxxxx>
> ---
>  .../bindings/input/qcom,qpnp-haptics.yaml     | 123 ++++++++++++++++++
>  include/dt-bindings/input/qcom,qpnp-haptics.h |  31 +++++
>  2 files changed, 154 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/qcom,qpnp-haptics.yaml
>  create mode 100644 include/dt-bindings/input/qcom,qpnp-haptics.h
> 
> diff --git a/Documentation/devicetree/bindings/input/qcom,qpnp-haptics.yaml b/Documentation/devicetree/bindings/input/qcom,qpnp-haptics.yaml
> new file mode 100644
> index 000000000000..81dd8d6321f0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/qcom,qpnp-haptics.yaml
> @@ -0,0 +1,123 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2020 Unisoc Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/qcom,qpnp-haptics.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Technologies Inc PMI8998 QPNP haptics
> +
> +maintainers:
> +  - Caleb Connolly <caleb@xxxxxxxxxxxxx>
> +
> +description: |
> +  QPNP (Qualcomm Technologies, Inc. Plug N Play) Haptics is a peripheral on some
> +  QTI PMICs. It supports linear resonant actuators commonly found in mobile devices.

Please avoid the Plug'n Play naming, just go with Qualcomm SPMI Haptics

> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,qpnp-haptics

qcom,spmi-haptics

But could we also have some pmic-specific compatibles in the binding?
Even though we might not need them in the driver today.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    minItems: 2

I don't think you need minItems, when you list the "items"

> +    items:
> +      - description: short circuit interrupt
> +      - description: play interrupt
> +
> +  interrupt-names:
> +    minItems: 2
> +    items:
> +      - const: short
> +      - const: play
> +
> +  qcom,actuator-type:
> +    description: |
> +      The type of actuator attached to the hardware.
> +      Allowed values are,
> +        0 - HAP_TYPE_LRA
> +        1 - HAP_TYPE_ERM
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [ 0, 1 ]
> +    default: 0
> +
> +  qcom,wave-shape:
> +    description: |
> +      Selects the wave shape to use.
> +      Allowed values are,
> +        0 - HAP_WAVE_SINE
> +        1 - HAP_WAVE_SQUARE
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [ 0, 1 ]
> +    default: 0
> +
> +  qcom,play-mode:
> +    description: |
> +      Selects the play mode to use.
> +      Allowed values are,
> +        0 - HAP_PLAY_DIRECT
> +        1 - HAP_PLAY_BUFFER
> +        2 - HAP_PLAY_AUDIO
> +        3 - HAP_PLAY_PWM
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [ 0, 1, 2, 3 ]
> +    default: 2
> +
> +  qcom,wave-play-rate-us:
> +    description: |
> +      Wave sample durection in microseconds, 1/f where f
> +      is the resonant frequency of the actuator.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 0
> +    maximum: 20475
> +
> +  qcom,brake-pattern:
> +    minItems: 4

It's also maxItems: 4, right?

> +    description: |
> +      The brake pattern are the strengths of the pattern
> +      used to brake the haptics. Allowed values are,
> +        0 - 0V
> +        1 - Vmax/4
> +        2 - Vmax/2
> +        3 - Vmax
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    default: [0x3, 0x3, 0x2, 0x1]
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - qcom,wave-play-rate-us
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/spmi/spmi.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/input/qcom,qpnp-haptics.h>

Would be nice with a blank line here.

> +    pmi8998_lsid1: pmic@3 {
> +      compatible = "qcom,pmi8998", "qcom,spmi-pmic";
> +      reg = <0x3 SPMI_USID>;
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      qpnp_haptics: qcom,haptics@c000 {

No "qcom," in the node name please.

> +        compatible = "qcom,qpnp-haptics";
> +        reg = <0xc000 0x100>;

With #size-cells = <0> this means that you have 2 regs, but binding says
that you may only have one.

> +
> +        interrupts = <0x3 0xc0 0x0 IRQ_TYPE_EDGE_BOTH>,
> +              <0x3 0xc0 0x1 IRQ_TYPE_EDGE_BOTH>;

I don't think the '<' on those two lines are lining up.

Regards,
Bjorn

> +        interrupt-names = "short", "play";
> +
> +        qcom,actuator-type = <HAP_TYPE_LRA>;
> +        qcom,wave-shape = <HAP_WAVE_SINE>;
> +        qcom,play-mode = <HAP_PLAY_BUFFER>;
> +        qcom,brake-pattern = <0x3 0x3 0x2 0x1>;
> +
> +        qcom,wave-play-rate-us = <4255>;
> +      };
> +    };
> diff --git a/include/dt-bindings/input/qcom,qpnp-haptics.h b/include/dt-bindings/input/qcom,qpnp-haptics.h
> new file mode 100644
> index 000000000000..bfbec041484c
> --- /dev/null
> +++ b/include/dt-bindings/input/qcom,qpnp-haptics.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * This header provides constants for pmi8998 qpnp haptics options.
> + */
> +
> +#ifndef _DT_BINDINGS_QCOM_PMIC_QPNP_HAPTICS_
> +#define _DT_BINDINGS_QCOM_PMIC_QPNP_HAPTICS_
> +
> +// Actuator types
> +#define HAP_TYPE_LRA		0
> +#define HAP_TYPE_ERM		1
> +
> +// LRA Wave type
> +#define HAP_WAVE_SINE		0
> +#define HAP_WAVE_SQUARE		1
> +
> +// Play modes
> +#define HAP_PLAY_DIRECT		0
> +#define HAP_PLAY_BUFFER		1
> +#define HAP_PLAY_AUDIO		2
> +#define HAP_PLAY_PWM		3
> +
> +#define HAP_PLAY_MAX		HAP_PLAY_PWM
> +
> +#define HAP_AUTO_RES_NONE	0
> +#define HAP_AUTO_RES_ZXD	1
> +#define HAP_AUTO_RES_QWD	2
> +#define HAP_AUTO_RES_MAX_QWD	3
> +#define HAP_AUTO_RES_ZXD_EOP	4
> +
> +#endif /* _DT_BINDINGS_QCOM_PMIC_QPNP_HAPTICS_ */
> --
> 2.31.1
> 
>