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Sat, 31 Aug 2024 11:11:44 -0700 (PDT) Received: from [172.16.118.100] ([103.15.228.94]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-205152d03fasm43302265ad.114.2024.08.31.11.11.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 31 Aug 2024 11:11:44 -0700 (PDT) Message-ID: Date: Sat, 31 Aug 2024 23:41:35 +0530 Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/7] dt-bindings: connector: Add mikrobus-connector Content-Language: en-US To: Michael Walle , Mark Brown , Vaishnav M A , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Greg Kroah-Hartman , Nishanth Menon , Vignesh Raghavendra , Tero Kristo , Andrew Lunn , jkridner@beagleboard.org, robertcnelson@beagleboard.org Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20240627-mikrobus-scratch-spi-v5-0-9e6c148bf5f0@beagleboard.org> <20240627-mikrobus-scratch-spi-v5-1-9e6c148bf5f0@beagleboard.org> From: Ayush Singh In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit >> But here you can have subnodes, no? These could then be just >> enumerated as usual. >> >> &mikrobus_board { >> mikrobus_gpio: gpio { >> gpio-controller; >> #gpio-cells = <1>; >> }; >> >> spi { >> cs-gpios = <&mikrobus_gpio 1>; >> >> spi@0 { >> compatible = "mydevice"; >> reg = <0>; >> }; >> }; >> }; >> Hi, I am now working on an approach for mikroBUS based on the apprach described here: [1] I am thinking of the gpio-controller approach you seem to have used here. So I wanted to inquire if there already exists a gpio-controller driver that can create a proxy controller that forwards stuff to the underlying actual controller. So something like the following: &mikrobus_gpio: gpio {     gpio-controller;     #gpio-cells = <2>;     gpios = <&gpio1 0>, <&gpi2 1>; }; spi {     cs-gpios = <&mikrobus_gpio 1 GPIO_ACTIVE_HIGH>; }; There does exist gpio0-virtio, but that seems to be for vm context. [1]: https://lore.kernel.org/linux-arm-kernel/20240702164403.29067-1-afd@ti.com/ Ayush Singh