linux-kernel - Re: [PATCH v2 2/2] dt-bindings: trivial-devices: Add qca,qca4024

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Date: Fri, 16 Feb 2024 08:19:19 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: frut3k7 <frut3k7@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>, Robert Marko <robimarko@...il.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Mark Brown <broonie@...nel.org>,
 Guenter Roeck <linux@...ck-us.net>, Peter Yin <peteryin.openbmc@...il.com>,
 Patrick Rudolph <patrick.rudolph@...ements.com>,
 Michal Simek <michal.simek@....com>, Marek Vasut <marex@...x.de>,
 Luca Ceresoli <luca.ceresoli@...tlin.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Lukas Wunner <lukas@...ner.de>,
 Fabio Estevam <festevam@...x.de>,
 Alexander Stein <alexander.stein@...tq-group.com>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-spi@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt-bindings: trivial-devices: Add qca,qca4024

On 15/02/2024 23:01, frut3k7 wrote:
> The device I use has the QCA4024 chip connected via the spi controller:
>         blsp1_spi4: spi@...8000 {
>             compatible = "qcom,spi-qup-v2.2.1";
>             #address-cells = <1>;
>             #size-cells = <0>;
>             reg = <0x78b8000 0x600>;
>             interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
>             clocks = <&gcc GCC_BLSP1_QUP4_SPI_APPS_CLK>,
>                  <&gcc GCC_BLSP1_AHB_CLK>;
>             clock-names = "core", "iface";
>             dmas = <&blsp_dma 18>, <&blsp_dma 19>;
>             dma-names = "tx", "rx";
>             status = "disabled";
>         };
> 
> and apart from setting the frequency and gpio there is nothing else:
>         &blsp1_spi4 {
>             status = "okay";
> 
>             pinctrl-0 = <&spi_3_pins &quartz_pins>;
>             pinctrl-names = "default";
> 
>             /* Qualcomm QCA4024 IoT */
>             iot@3 {
>                 compatible = "qca,qca4024";
>                 reg = <0>;
>                 spi-max-frequency = <24000000>;

That's your downstream or fork DTS, not hardware description. You could
have several regulators not listed here, because your downstream has
always-on, or clocks which are not taken and works due to
assigned-clocks in other places... Sorry, that's not an argument. Never
use downstream DTS as proof how hardware looks. It is usually dis-proof,
that things are certainly missing.

Best regards,
Krzysztof