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Message-ID: <75597c55-24f8-a76c-334d-cedc186aa841@linaro.org>
Date: Wed, 28 Sep 2022 13:34:01 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Chunyan Zhang <zhang.lyra@...il.com>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
Baolin Wang <baolin.wang7@...il.com>,
Orson Zhai <orsonzhai@...il.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings: gpio: Conver Unisoc EIC controller
binding to yaml
On 28/09/2022 11:29, Chunyan Zhang wrote:
> From: Chunyan Zhang <chunyan.zhang@...soc.com>
>
> Convert the Unisoc EIC controller binding to DT schema format.
>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
> ---
> .../bindings/gpio/gpio-eic-sprd.txt | 97 ------------
> .../bindings/gpio/sprd,gpio-eic.yaml | 145 ++++++++++++++++++
> 2 files changed, 145 insertions(+), 97 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt
> create mode 100644 Documentation/devicetree/bindings/gpio/sprd,gpio-eic.yaml
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt b/Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt
> deleted file mode 100644
> index 54040a2bfe3a..000000000000
> --- a/Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt
> +++ /dev/null
> @@ -1,97 +0,0 @@
> -Spreadtrum EIC controller bindings
> -
> -The EIC is the abbreviation of external interrupt controller, which can
> -be used only in input mode. The Spreadtrum platform has 2 EIC controllers,
> -one is in digital chip, and another one is in PMIC. The digital chip EIC
> -controller contains 4 sub-modules: EIC-debounce, EIC-latch, EIC-async and
> -EIC-sync. But the PMIC EIC controller contains only one EIC-debounce sub-
> -module.
> -
> -The EIC-debounce sub-module provides up to 8 source input signal
> -connections. A debounce mechanism is used to capture the input signals'
> -stable status (millisecond resolution) and a single-trigger mechanism
> -is introduced into this sub-module to enhance the input event detection
> -reliability. In addition, this sub-module's clock can be shut off
> -automatically to reduce power dissipation. Moreover the debounce range
> -is from 1ms to 4s with a step size of 1ms. The input signal will be
> -ignored if it is asserted for less than 1 ms.
> -
> -The EIC-latch sub-module is used to latch some special power down signals
> -and generate interrupts, since the EIC-latch does not depend on the APB
> -clock to capture signals.
> -
> -The EIC-async sub-module uses a 32kHz clock to capture the short signals
> -(microsecond resolution) to generate interrupts by level or edge trigger.
> -
> -The EIC-sync is similar with GPIO's input function, which is a synchronized
> -signal input register. It can generate interrupts by level or edge trigger
> -when detecting input signals.
> -
> -Required properties:
> -- compatible: Should be one of the following:
> - "sprd,sc9860-eic-debounce",
> - "sprd,sc9860-eic-latch",
> - "sprd,sc9860-eic-async",
> - "sprd,sc9860-eic-sync",
> - "sprd,sc2731-eic".
> -- reg: Define the base and range of the I/O address space containing
> - the GPIO controller registers.
> -- gpio-controller: Marks the device node as a GPIO controller.
> -- #gpio-cells: Should be <2>. The first cell is the gpio number and
> - the second cell is used to specify optional parameters.
> -- interrupt-controller: Marks the device node as an interrupt controller.
> -- #interrupt-cells: Should be <2>. Specifies the number of cells needed
> - to encode interrupt source.
> -- interrupts: Should be the port interrupt shared by all the gpios.
> -
> -Example:
> - eic_debounce: gpio@...10000 {
> - compatible = "sprd,sc9860-eic-debounce";
> - reg = <0 0x40210000 0 0x80>;
> - gpio-controller;
> - #gpio-cells = <2>;
> - interrupt-controller;
> - #interrupt-cells = <2>;
> - interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>;
> - };
> -
> - eic_latch: gpio@...10080 {
> - compatible = "sprd,sc9860-eic-latch";
> - reg = <0 0x40210080 0 0x20>;
> - gpio-controller;
> - #gpio-cells = <2>;
> - interrupt-controller;
> - #interrupt-cells = <2>;
> - interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>;
> - };
> -
> - eic_async: gpio@...100a0 {
> - compatible = "sprd,sc9860-eic-async";
> - reg = <0 0x402100a0 0 0x20>;
> - gpio-controller;
> - #gpio-cells = <2>;
> - interrupt-controller;
> - #interrupt-cells = <2>;
> - interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>;
> - };
> -
> - eic_sync: gpio@...100c0 {
> - compatible = "sprd,sc9860-eic-sync";
> - reg = <0 0x402100c0 0 0x20>;
> - gpio-controller;
> - #gpio-cells = <2>;
> - interrupt-controller;
> - #interrupt-cells = <2>;
> - interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>;
> - };
> -
> - pmic_eic: gpio@300 {
> - compatible = "sprd,sc2731-eic";
> - reg = <0x300>;
> - interrupt-parent = <&sc2731_pmic>;
> - interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
> - gpio-controller;
> - #gpio-cells = <2>;
> - interrupt-controller;
> - #interrupt-cells = <2>;
> - };
> diff --git a/Documentation/devicetree/bindings/gpio/sprd,gpio-eic.yaml b/Documentation/devicetree/bindings/gpio/sprd,gpio-eic.yaml
> new file mode 100644
> index 000000000000..e25ee1884c07
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/sprd,gpio-eic.yaml
> @@ -0,0 +1,145 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2022 Unisoc Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/sprd,gpio-eic.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Unisoc EIC controller
> +
> +maintainers:
> + - Orson Zhai <orsonzhai@...il.com>
> + - Baolin Wang <baolin.wang7@...il.com>
> + - Chunyan Zhang <zhang.lyra@...il.com>
> +
> +description:
> + The EIC is the abbreviation of external interrupt controller, which can
> + be used only in input mode. The Spreadtrum platform has 2 EIC controllers,
> + one is in digital chip, and another one is in PMIC. The digital chip EIC
> + controller contains 4 sub-modules, i.e. EIC-debounce, EIC-latch, EIC-async and
> + EIC-sync. But the PMIC EIC controller contains only one EIC-debounce sub-
> + module.
> +
> + The EIC-debounce sub-module provides up to 8 source input signal
> + connections. A debounce mechanism is used to capture the input signals'
> + stable status (millisecond resolution) and a single-trigger mechanism
> + is introduced into this sub-module to enhance the input event detection
> + reliability. In addition, this sub-module's clock can be shut off
> + automatically to reduce power dissipation. Moreover the debounce range
> + is from 1ms to 4s with a step size of 1ms. The input signal will be
> + ignored if it is asserted for less than 1 ms.
> +
> + The EIC-latch sub-module is used to latch some special power down signals
> + and generate interrupts, since the EIC-latch does not depend on the APB
> + clock to capture signals.
> +
> + The EIC-async sub-module uses a 32kHz clock to capture the short signals
> + (microsecond resolution) to generate interrupts by level or edge trigger.
> +
> + The EIC-sync is similar with GPIO's input function, which is a synchronized
> + signal input register. It can generate interrupts by level or edge trigger
> + when detecting input signals.
> +
> +properties:
> + compatible:
> + enum:
> + - sprd,sc9860-eic-debounce
> + - sprd,sc9860-eic-latch
> + - sprd,sc9860-eic-async
> + - sprd,sc9860-eic-sync
> + - sprd,sc2731-eic
> +
> + reg:
> + minItems: 1
> + maxItems: 4
Why up to 4 items? Previous bindings did not mention it. I also do not
see any users of this. Anyway you need to describe the items (items with
description) and restrict per variant in allOf:if:then
> +
> + gpio-controller: true
> +
> + "#gpio-cells":
> + const: 2
> +
> + interrupt-controller: true
> +
> + "#interrupt-cells":
> + const: 2
> +
> + interrupts:
> + maxItems: 1
> + description: The interrupt shared by all GPIO lines for this controller.
> +
> +required:
> + - compatible
> + - reg
> + - gpio-controller
> + - "#gpio-cells"
> + - interrupt-controller
> + - "#interrupt-cells"
> + - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> + soc {
> + #address-cells = <2>;
> + #size-cells = <2>;
> +
> + eic_debounce: gpio@...10000 {
> + compatible = "sprd,sc9860-eic-debounce";
> + reg = <0 0x40210000 0 0x80>;
> + gpio-controller;
> + #gpio-cells = <2>;
> + interrupt-controller;
> + #interrupt-cells = <2>;
> + interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>;
One example is enough. All others are the same.
Best regards,
Krzysztof
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