linux-kernel - Re: [PATCH v3 04/12] dt-bindings: misc: Add device specific bindings for RaspberryPi RP1

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Message-ID: <20241106145022.t7w2762t7zxpefc3@thinkpad>
Date: Wed, 6 Nov 2024 14:50:22 +0000
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Andrea della Porta <andrea.porta@...e.com>
Cc: Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczynski <kw@...ux.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Saravana Kannan <saravanak@...gle.com>, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-gpio@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Stefan Wahren <wahrenst@....net>,
	Herve Codina <herve.codina@...tlin.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v3 04/12] dt-bindings: misc: Add device specific bindings
 for RaspberryPi RP1

On Mon, Oct 28, 2024 at 03:07:21PM +0100, Andrea della Porta wrote:
> The RP1 is a MFD that exposes its peripherals through PCI BARs. This
> schema is intended as minimal support for the clock generator and
> gpio controller peripherals which are accessible through BAR1.
> 
> Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> ---
>  .../devicetree/bindings/misc/pci1de4,1.yaml   | 80 +++++++++++++++++++
>  MAINTAINERS                                   |  1 +
>  2 files changed, 81 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/pci1de4,1.yaml
> 
> diff --git a/Documentation/devicetree/bindings/misc/pci1de4,1.yaml b/Documentation/devicetree/bindings/misc/pci1de4,1.yaml
> new file mode 100644
> index 000000000000..d66b2fc130d1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/pci1de4,1.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/misc/pci1de4,1.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: RaspberryPi RP1 MFD PCI device
> +
> +maintainers:
> +  - Andrea della Porta <andrea.porta@...e.com>
> +
> +description:
> +  The RaspberryPi RP1 is a PCI multi function device containing
> +  peripherals ranging from Ethernet to USB controller, I2C, SPI
> +  and others.
> +  The peripherals are accessed by addressing the PCI BAR1 region.
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-ep-bus.yaml
> +
> +properties:
> +  compatible:
> +    additionalItems: true
> +    maxItems: 3
> +    items:
> +      - const: pci1de4,1
> +
> +  '#interrupt-cells':
> +    const: 2
> +    description:
> +      Specifies respectively the interrupt number and flags as defined
> +      in include/dt-bindings/interrupt-controller/irq.h.
> +
> +  interrupt-controller: true
> +
> +unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - '#interrupt-cells'
> +  - interrupt-controller
> +  - pci-ep-bus@1
> +
> +examples:
> +  - |
> +    pci {
> +        #address-cells = <3>;
> +        #size-cells = <2>;
> +
> +        rp1@0,0 {
> +            compatible = "pci1de4,1";
> +            ranges = <0x01 0x00 0x00000000
> +                      0x82010000 0x00 0x00
> +                      0x00 0x400000>;

Could you please have the 'ranges' in a single line as used everywhere?

- Mani

> +            #address-cells = <3>;
> +            #size-cells = <2>;
> +            interrupt-controller;
> +            #interrupt-cells = <2>;
> +
> +            pci_ep_bus: pci-ep-bus@1 {
> +                compatible = "simple-bus";
> +                ranges = <0xc0 0x40000000
> +                          0x01 0x00 0x00000000
> +                          0x00 0x00400000>;
> +                dma-ranges = <0x10 0x00000000
> +                              0x43000000 0x10 0x00000000
> +                              0x10 0x00000000>;
> +                #address-cells = <2>;
> +                #size-cells = <2>;
> +
> +                rp1_clocks: clocks@...0018000 {
> +                    compatible = "raspberrypi,rp1-clocks";
> +                    reg = <0xc0 0x40018000 0x0 0x10038>;
> +                    #clock-cells = <1>;
> +                    clocks = <&clk_rp1_xosc>;
> +                    clock-names =  "xosc";
> +                };
> +            };
> +        };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ccf123b805c8..2aea5a6166bd 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19384,6 +19384,7 @@ RASPBERRY PI RP1 PCI DRIVER
>  M:	Andrea della Porta <andrea.porta@...e.com>
>  S:	Maintained
>  F:	Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml
> +F:	Documentation/devicetree/bindings/misc/pci1de4,1.yaml
>  F:	Documentation/devicetree/bindings/pci/pci-ep-bus.yaml
>  F:	Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml
>  F:	include/dt-bindings/clock/rp1.h
> -- 
> 2.35.3
> 

-- 
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