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Date: Tue, 22 Sep 2020 14:37:14 -0600
From: Rob Herring <robh@...nel.org>
To: Sagar Kadam <sagar.kadam@...ive.com>
Cc: linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
linux-clk@...r.kernel.org, mturquette@...libre.com,
sboyd@...nel.org, paul.walmsley@...ive.com, palmer@...belt.com,
tglx@...utronix.de, jason@...edaemon.net, maz@...nel.org,
thierry.reding@...il.com, u.kleine-koenig@...gutronix.de,
lee.jones@...aro.org, aou@...s.berkeley.edu, yash.shah@...ive.com
Subject: Re: [PATCH v1 3/3] dt-bindings: riscv: convert pwm bindings to
json-schema
On Thu, Sep 10, 2020 at 04:14:04PM +0530, Sagar Kadam wrote:
> Convert device tree bindings for SiFive's PWM controller to YAML
> format.
>
> Signed-off-by: Sagar Kadam <sagar.kadam@...ive.com>
> ---
> .../devicetree/bindings/pwm/pwm-sifive.txt | 33 ----------
> .../devicetree/bindings/pwm/pwm-sifive.yaml | 72 ++++++++++++++++++++++
> 2 files changed, 72 insertions(+), 33 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/pwm/pwm-sifive.txt
> create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sifive.yaml
>
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-sifive.txt b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt
> deleted file mode 100644
> index 3d1dd7b0..0000000
> --- a/Documentation/devicetree/bindings/pwm/pwm-sifive.txt
> +++ /dev/null
> @@ -1,33 +0,0 @@
> -SiFive PWM controller
> -
> -Unlike most other PWM controllers, the SiFive PWM controller currently only
> -supports one period for all channels in the PWM. All PWMs need to run at
> -the same period. The period also has significant restrictions on the values
> -it can achieve, which the driver rounds to the nearest achievable period.
> -PWM RTL that corresponds to the IP block version numbers can be found
> -here:
> -
> -https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm
> -
> -Required properties:
> -- compatible: Should be "sifive,<chip>-pwm" and "sifive,pwm<version>".
> - Supported compatible strings are: "sifive,fu540-c000-pwm" for the SiFive
> - PWM v0 as integrated onto the SiFive FU540 chip, and "sifive,pwm0" for the
> - SiFive PWM v0 IP block with no chip integration tweaks.
> - Please refer to sifive-blocks-ip-versioning.txt for details.
> -- reg: physical base address and length of the controller's registers
> -- clocks: Should contain a clock identifier for the PWM's parent clock.
> -- #pwm-cells: Should be 3. See pwm.yaml in this directory
> - for a description of the cell format.
> -- interrupts: one interrupt per PWM channel
> -
> -Examples:
> -
> -pwm: pwm@...20000 {
> - compatible = "sifive,fu540-c000-pwm", "sifive,pwm0";
> - reg = <0x0 0x10020000 0x0 0x1000>;
> - clocks = <&tlclk>;
> - interrupt-parent = <&plic>;
> - interrupts = <42 43 44 45>;
> - #pwm-cells = <3>;
> -};
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-sifive.yaml b/Documentation/devicetree/bindings/pwm/pwm-sifive.yaml
> new file mode 100644
> index 0000000..415d053
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-sifive.yaml
> @@ -0,0 +1,72 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2020 SiFive, Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/pwm-sifive.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: SiFive PWM controller
> +
> +maintainers:
> + - Yash Shah <yash.shah@...ive.com>
> + - Sagar Kadam <sagar.kadam@...ive.com>
> + - Paul Walmsley <paul.walmsley@...ive.com>
> +
> +description:
> + Unlike most other PWM controllers, the SiFive PWM controller currently
> + only supports one period for all channels in the PWM. All PWMs need to
> + run at the same period. The period also has significant restrictions on
> + the values it can achieve, which the driver rounds to the nearest
> + achievable period. PWM RTL that corresponds to the IP block version
> + numbers can be found here -
> +
> + https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm
> +
> +properties:
> + compatible:
> + items:
> + - const: sifive,fu540-c000-pwm
> + - const: sifive,pwm0
> + description:
> + Should be "sifive,<chip>-pwm" and "sifive,pwm<version>". Supported
> + compatible strings are "sifive,fu540-c000-pwm" for the SiFive PWM v0
> + as integrated onto the SiFive FU540 chip, and "sifive,pwm0" for the
> + SiFive PWM v0 IP block with no chip integration tweaks.
> + Please refer to sifive-blocks-ip-versioning.txt for details.
> +
> + reg:
> + maxItems: 1
> + description: Physical base address and length of the controller's registers
Drop description.
> +
> + clocks:
> + description: Should contain a clock identifier for the PWM's parent clock.
How many clocks?
> +
> + "#pwm-cells":
> + const: 3
> + description:
> + Should be 3. See pwm.yaml in this directory for a description of the
> + cell format.
Drop.
> +
> + interrupts:
> + maxItems: 1
Is it 1 or...
> + description: One interrupt per PWM channel.
one per channel?
> +
> +required:
> + - compatible
> + - reg
> + - clocks
> + - "#pwm-cells"
> + - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + pwm: pwm@...20000 {
> + compatible = "sifive,fu540-c000-pwm", "sifive,pwm0";
> + reg = <0x10020000 0x1000>;
> + clocks = <&tlclk>;
> + interrupt-parent = <&plic>;
> + interrupts = <42 43 44 45>;
Split entries:
interrupts = <42>, <43>, <44>, <45>;
> + #pwm-cells = <3>;
> + };
> --
> 2.7.4
>
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