linux-kernel - Re: [PATCH v2 1/6] dt-bindings: PCI: fu740-pci: fix missing clock-names

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Message-Id: <F62BE8A7-2023-497B-9BBC-AE54E7C5B08A@jrtc27.com>
Date:   Tue, 16 Aug 2022 22:05:55 +0100
From:   Jessica Clarke <jrtc27@...c27.com>
To:     Conor Dooley <mail@...chuod.ie>
Cc:     Daire McNamara <daire.mcnamara@...rochip.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Greentime Hu <greentime.hu@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 1/6] dt-bindings: PCI: fu740-pci: fix missing
 clock-names

On 16 Aug 2022, at 19:25, Conor Dooley <mail@...chuod.ie> wrote:
> 
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> The commit b92225b034c0 ("dt-bindings: PCI: designware: Fix
> 'unevaluatedProperties' warnings") removed the clock-names property as
> a requirement and from the example as it triggered unevaluatedProperty
> warnings. dtbs_check was not able to pick up on this at the time, but
> now can:
> 
> arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dtb: pcie@...000000: Unevaluated properties are not allowed ('clock-names' was unexpected)
>        From schema: linux/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
> 
> The property was already in use by the FU740 DTS and the clock must be
> enabled. The Linux driver does not use this property, but outside of
> the kernel this property may have users. Re-add the property and its
> "clocks" dependency.

Are you sure about this? I see a devm_clk_get("pcie_aux") that surely
won't without the property. FreeBSD’s similarly relies on the name,
though it also has a fallback to the U-Boot pcieaux name (because the
world is terrible and people can’t even agree on that) so it works
with the U-Boot-provided FDT (it would be nice if Linux had this as a
goal, and people worked with U-Boot devs to get everything needed for
newly-exposed devices merged back there so I don’t have to be the one
to notice and do it...).

Jess

> Fixes: b92225b034c0 ("dt-bindings: PCI: designware: Fix 'unevaluatedProperties' warnings")
> Fixes: 43cea116be0b ("dt-bindings: PCI: Add SiFive FU740 PCIe host controller")
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
> v2022.08 of dt-schema is required.
> ---
> .../devicetree/bindings/pci/sifive,fu740-pcie.yaml          | 6 ++++++
> 1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml b/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
> index 195e6afeb169..c7a9a2dc0fa6 100644
> --- a/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
> @@ -51,6 +51,12 @@ properties:
>     description: A phandle to the PCIe power up reset line.
>     maxItems: 1
> 
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: pcie_aux
> +
>   pwren-gpios:
>     description: Should specify the GPIO for controlling the PCI bus device power on.
>     maxItems: 1
> -- 
> 2.37.1
> 
> 
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> linux-riscv@...ts.infradead.org
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