Message-ID: <20241002232801.GA1520357-robh@kernel.org>
Date: Wed, 2 Oct 2024 18:28:01 -0500
From: Rob Herring <robh@...nel.org>
To: Conor Dooley <conor@...nel.org>
Cc: linux-kernel@...r.kernel.org, Conor Dooley <conor.dooley@...rochip.com>,
	Daire McNamara <daire.mcnamara@...rochip.com>,
	pierre-henry.moussay@...rochip.com,
	valentina.fernandezalanis@...rochip.com,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Jassi Brar <jassisinghbrar@...il.com>, Lee Jones <lee@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Jerome Brunet <jbrunet@...libre.com>,
	Kevin Hilman <khilman@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-riscv@...ts.infradead.org, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-amlogic@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 04/11] dt-bindings: soc: microchip: document the two
 simple-mfd syscons on PolarFire SoC

On Wed, Oct 02, 2024 at 11:48:02AM +0100, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> There are two syscons on PolarFire SoC that provide various functionality of
> use to the OS.
> 
> The first of these is the "control-scb" region, that contains the "tvs"
> temperature and voltage sensors and the control/status registers for the
> system controller's mailbox. The mailbox has a dedicated node, so
> there's no need for a child node describing it, looking the syscon up by
> compatible is sufficient.
> 
> The second, "mss-top-sysreg", contains clocks, pinctrl, resets, and
> interrupt controller and more. At this point, only the reset controller
> child is described as that's all that is described by the existing
> bindings. The clock controller already has a dedicated node, and will
> retain it as there are other clock regions, so like the mailbox,
> a compatible-based lookup of the syscon is sufficient to keep the clock
> driver working as before so no child is needed. There's also an
> interrupt multiplexing service provided by this syscon, for which there
> is work in progress at [1].
> 
> Link: https://lore.kernel.org/linux-gpio/20240723-uncouple-enforcer-7c48e4a4fefe@wendy/ [1]
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  .../microchip/microchip,mpfs-control-scb.yaml | 44 +++++++++++++++
>  .../microchip,mpfs-mss-top-sysreg.yaml        | 54 +++++++++++++++++++
>  2 files changed, 98 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-control-scb.yaml
>  create mode 100644 Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-control-scb.yaml b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-control-scb.yaml
> new file mode 100644
> index 0000000000000..4f9168320243c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-control-scb.yaml
> @@ -0,0 +1,44 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/microchip/microchip,mpfs-control-scb.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip PolarFire SoC System Controller Bus (SCB) Control Register region
> +
> +maintainers:
> +  - Conor Dooley <conor.dooley@...rochip.com>
> +
> +description:
> +  An assortment of system controller related registers, including voltage and
> +  temperature sensors and the status/control registers for the system
> +  controller's mailbox.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: microchip,mpfs-control-scb
> +      - const: syscon
> +      - const: simple-mfd

Where's the child nodes?

> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    soc {
> +      #address-cells = <1>;
> +      #size-cells = <1>;

Don't need the soc node.

> +
> +      syscon@...20000 {
> +        compatible = "microchip,mpfs-control-scb", "syscon", "simple-mfd";
> +        reg = <0x37020000 0x100>;
> +      };
> +    };
> +
> diff --git a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml
> new file mode 100644
> index 0000000000000..98ccec3caad51
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml
> @@ -0,0 +1,54 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip PolarFire SoC Microprocessor Subsystem (MSS) sysreg Register region
> +
> +maintainers:
> +  - Conor Dooley <conor.dooley@...rochip.com>
> +
> +description:
> +  An wide assortment of registers that control elements of the MSS on PolarFire
> +  SoC, including pinmuxing, resets and clocks among others.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: microchip,mpfs-mss-top-sysreg
> +      - const: syscon
> +      - const: simple-mfd
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#reset-cells':
> +    description: |

Don't need '|'.

> +      The AHB/AXI peripherals on the PolarFire SoC have reset support, so
> +      from CLK_ENVM to CLK_CFM. The reset consumer should specify the
> +      desired peripheral via the clock ID in its "resets" phandle cell.
> +      See include/dt-bindings/clock/microchip,mpfs-clock.h for the full list
> +      of PolarFire clock/reset IDs.
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - '#reset-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    soc {
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +
> +      syscon@...02000 {
> +        compatible = "microchip,mpfs-mss-top-sysreg", "syscon", "simple-mfd";
> +        reg = <0x20002000 0x1000>;
> +        #reset-cells = <1>;
> +      };
> +    };
> +
> -- 
> 2.45.2
> 

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