From: "Théo Lebrun" <theo.lebrun@bootlin.com> To: "Krzysztof Kozlowski" <krzysztof.kozlowski@linaro.org>, "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Rob Herring" <robh+dt@kernel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>, "Conor Dooley" <conor+dt@kernel.org>, "Roger Quadros" <rogerq@kernel.org>, "Peter Chen" <peter.chen@kernel.org>, "Pawel Laszczak" <pawell@cadence.com>, "Nishanth Menon" <nm@ti.com>, "Vignesh Raghavendra" <vigneshr@ti.com>, "Tero Kristo" <kristo@kernel.org> Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, "Grégory Clement" <gregory.clement@bootlin.com>, "Conor Dooley" <conor.dooley@microchip.com> Subject: Re: [PATCH v2 1/7] dt-bindings: usb: ti,j721e-usb: add ti,j7200-usb compatible Date: Tue, 21 Nov 2023 17:53:32 +0100 [thread overview] Message-ID: <CX4NADEZZEO1.3TXPVNOONKBCF@tleb-bootlin-xps13-01> (raw) In-Reply-To: <6f0da181-717c-4b14-ba3f-d287efe4105b@linaro.org> Hello, On Mon Nov 20, 2023 at 6:32 PM CET, Krzysztof Kozlowski wrote: > On 20/11/2023 18:06, Théo Lebrun wrote: > > On this platform, the controller & its wrapper are reset on resume. This > > makes it have a different behavior from other platforms. > > > > We allow using the new compatible with a fallback onto the original > > ti,j721e-usb compatible. We therefore allow using an older kernel with > > Where is fallback ti,j721e-usb used? Please point me to the code. No fallback is implemented in code. Using a kernel that doesn't have this patch series but a more recent devicetree: DT has both devicetrees & the kernel will know which driver to use. That is opposed to having only compatible = "ti,j7200-usb". If using an old kernel, it would not know what driver to match it to. [...] > > --- a/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml > > +++ b/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml > > @@ -12,11 +12,15 @@ maintainers: > > properties: > > compatible: > > oneOf: > > + - const: ti,j7200-usb > > - const: ti,j721e-usb > > - const: ti,am64-usb > > - items: > > - const: ti,j721e-usb > > - const: ti,am64-usb > > + - items: > > + - const: ti,j721e-usb > > This makes little sense. It's already on the list. Twice! Don't add it > third time. > > I am sorry, but this binding makes no sense. I mean, existing binding > makes no sense, but your change is not making it anyhow better. The goal of the DT schema pre-patch was to allow all three: compatible = "ti,j721e-usb"; compatible = "ti,am64-usb"; compatible = "ti,j721e-usb", "ti,am64-usb"; I've followed the same scheme & added both of those: compatible = "ti,j7200-usb"; compatible = "ti,j7200-usb", "ti,j721e-usb"; I messed up the ordering in the added 'items' options, but the logic seems right to me. And dtbs_check agrees. Am I missing something? Thanks, -- Théo Lebrun, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
WARNING: multiple messages have this Message-ID (diff)
From: "Théo Lebrun" <theo.lebrun@bootlin.com> To: "Krzysztof Kozlowski" <krzysztof.kozlowski@linaro.org>, "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Rob Herring" <robh+dt@kernel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>, "Conor Dooley" <conor+dt@kernel.org>, "Roger Quadros" <rogerq@kernel.org>, "Peter Chen" <peter.chen@kernel.org>, "Pawel Laszczak" <pawell@cadence.com>, "Nishanth Menon" <nm@ti.com>, "Vignesh Raghavendra" <vigneshr@ti.com>, "Tero Kristo" <kristo@kernel.org> Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, "Grégory Clement" <gregory.clement@bootlin.com>, "Conor Dooley" <conor.dooley@microchip.com> Subject: Re: [PATCH v2 1/7] dt-bindings: usb: ti,j721e-usb: add ti,j7200-usb compatible Date: Tue, 21 Nov 2023 17:53:32 +0100 [thread overview] Message-ID: <CX4NADEZZEO1.3TXPVNOONKBCF@tleb-bootlin-xps13-01> (raw) In-Reply-To: <6f0da181-717c-4b14-ba3f-d287efe4105b@linaro.org> Hello, On Mon Nov 20, 2023 at 6:32 PM CET, Krzysztof Kozlowski wrote: > On 20/11/2023 18:06, Théo Lebrun wrote: > > On this platform, the controller & its wrapper are reset on resume. This > > makes it have a different behavior from other platforms. > > > > We allow using the new compatible with a fallback onto the original > > ti,j721e-usb compatible. We therefore allow using an older kernel with > > Where is fallback ti,j721e-usb used? Please point me to the code. No fallback is implemented in code. Using a kernel that doesn't have this patch series but a more recent devicetree: DT has both devicetrees & the kernel will know which driver to use. That is opposed to having only compatible = "ti,j7200-usb". If using an old kernel, it would not know what driver to match it to. [...] > > --- a/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml > > +++ b/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml > > @@ -12,11 +12,15 @@ maintainers: > > properties: > > compatible: > > oneOf: > > + - const: ti,j7200-usb > > - const: ti,j721e-usb > > - const: ti,am64-usb > > - items: > > - const: ti,j721e-usb > > - const: ti,am64-usb > > + - items: > > + - const: ti,j721e-usb > > This makes little sense. It's already on the list. Twice! Don't add it > third time. > > I am sorry, but this binding makes no sense. I mean, existing binding > makes no sense, but your change is not making it anyhow better. The goal of the DT schema pre-patch was to allow all three: compatible = "ti,j721e-usb"; compatible = "ti,am64-usb"; compatible = "ti,j721e-usb", "ti,am64-usb"; I've followed the same scheme & added both of those: compatible = "ti,j7200-usb"; compatible = "ti,j7200-usb", "ti,j721e-usb"; I messed up the ordering in the added 'items' options, but the logic seems right to me. And dtbs_check agrees. Am I missing something? Thanks, -- Théo Lebrun, Bootlin Embedded Linux and Kernel engineering https://bootlin.com _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-11-21 16:53 UTC|newest] Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-11-20 17:06 [PATCH v2 0/7] usb: cdns: fix suspend on J7200 by assuming reset-on-resume Théo Lebrun 2023-11-20 17:06 ` Théo Lebrun 2023-11-20 17:06 ` [PATCH v2 1/7] dt-bindings: usb: ti,j721e-usb: add ti,j7200-usb compatible Théo Lebrun 2023-11-20 17:06 ` Théo Lebrun 2023-11-20 17:32 ` Krzysztof Kozlowski 2023-11-20 17:32 ` Krzysztof Kozlowski 2023-11-21 16:53 ` Théo Lebrun [this message] 2023-11-21 16:53 ` Théo Lebrun 2023-11-21 17:11 ` Krzysztof Kozlowski 2023-11-21 17:11 ` Krzysztof Kozlowski 2023-11-22 10:46 ` Théo Lebrun 2023-11-22 10:46 ` Théo Lebrun 2023-11-22 12:00 ` Krzysztof Kozlowski 2023-11-22 12:00 ` Krzysztof Kozlowski 2023-11-22 17:14 ` Théo Lebrun 2023-11-22 17:14 ` Théo Lebrun 2023-11-20 17:06 ` [PATCH v2 2/7] usb: cdns3-ti: remove runtime PM Théo Lebrun 2023-11-20 17:06 ` Théo Lebrun 2023-11-22 23:42 ` Kevin Hilman 2023-11-22 23:42 ` Kevin Hilman 2023-11-20 17:06 ` [PATCH v2 3/7] usb: cdns3-ti: move reg writes from probe into an init_hw helper Théo Lebrun 2023-11-20 17:06 ` Théo Lebrun 2023-11-20 17:06 ` [PATCH v2 4/7] usb: cdns3-ti: add suspend/resume procedures for J7200 Théo Lebrun 2023-11-20 17:06 ` Théo Lebrun 2023-11-20 17:31 ` Krzysztof Kozlowski 2023-11-20 17:31 ` Krzysztof Kozlowski 2023-11-21 16:48 ` Théo Lebrun 2023-11-21 16:48 ` Théo Lebrun 2023-11-20 17:06 ` [PATCH v2 5/7] usb: cdns3: add quirk to platform data for reset-on-resume Théo Lebrun 2023-11-20 17:06 ` Théo Lebrun 2023-11-21 10:40 ` Peter Chen 2023-11-21 10:40 ` Peter Chen 2023-11-20 17:06 ` [PATCH v2 6/7] usb: cdns3-ti: signal reset-on-resume to xHCI for J7200 platform Théo Lebrun 2023-11-20 17:06 ` Théo Lebrun 2023-11-21 16:53 ` Roger Quadros 2023-11-21 16:53 ` Roger Quadros 2023-11-21 17:06 ` Théo Lebrun 2023-11-21 17:06 ` Théo Lebrun 2023-11-20 17:06 ` [PATCH v2 7/7] arm64: dts: ti: k3-j7200: use J7200-specific USB compatible Théo Lebrun 2023-11-20 17:06 ` Théo Lebrun 2023-11-20 17:32 ` Krzysztof Kozlowski 2023-11-20 17:32 ` Krzysztof Kozlowski 2023-11-20 17:33 ` [PATCH v2 0/7] usb: cdns: fix suspend on J7200 by assuming reset-on-resume Krzysztof Kozlowski 2023-11-20 17:33 ` Krzysztof Kozlowski 2023-11-22 23:44 ` Kevin Hilman 2023-11-22 23:44 ` Kevin Hilman
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