From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DB1F623909F; Wed, 29 Jul 2026 08:03:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785312209; cv=none; b=XVsFZr5TWbEfPif9aVXysx4dNao0qDKKAPhjC4NjGtEsRVFwZoMc13b9GcKTH1Ut3uf1B+CKew1V/P2JueEe9ao/+qZg2anBjbjR6CS95NQc/qfJ1BR+1FzDLMPriUnfX2QBA5CDgAxxwuik3T/e+U0cABEhxPu2Ne4XTCOMH8E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785312209; c=relaxed/simple; bh=GnZcwKI+XfZvnS2Df1q/BSFAho55OGNCVk7vAkSMC1A=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=AxauJaCGInOmf4erwoAZ11/SWC//3e/IiTWB852XvgXn4uszaJWrBG/5AKL/EtJqpS7tXSCu/8LrTeWmJ08crpxi+3Ed6bYLMer9XfiRQ7iEKaRH80rWIY6nqVwcWmAAB9m5N5EKZ5b0eR1Htk71xcySGIMZAuPCgHjsosY/j38= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IQ179P4C; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="IQ179P4C" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 449DA1F000E9; Wed, 29 Jul 2026 08:03:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785312205; bh=JteUNebrq8Y5BoF6qFLQtjZt8zz9HlOcVSVsWZpTXkA=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=IQ179P4CWgJQUfIO/xTq6P8zIgK/o1owHEh2nTPZngI7nTSouMh1AAPQGX2SPtybA 9TNXfo9m0yvDhta7jDb+MjlOM2UPaKBX6ll6ehaYxKrFmGHtkCJCgNwwZYXl0RZ/B6 0mEjmr1SfBPBoXAMwSPV3ZVrywogrGNy1UCka6tQnyDJUmv/1z7pQPylwCbvK8LRyI 3i83/lt0DkSA6bGzzWCpRajoLUkcSs/IaBEdUgYlnY5PODfPvLa/M1wdw3LG5ubFso 5pH8H4j2+JCn0VVtW4HoWrC3k/eSYM+NKpRaG+XeObT2VvRbmtjcuZGx7TCISUsDmc a42YPQ2BWxJyg== Message-ID: <986fac76-3bcd-4523-a902-701027aff1bf@kernel.org> Date: Wed, 29 Jul 2026 10:03:16 +0200 Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] dt-bindings: gpio: Add Axiado SGPIO controller To: Petar Stepanovic , Tzu-Hao Wei , Swark Yang , Prasad Bolisetty , Linus Walleij , Bartosz Golaszewski , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Harshit Shah , SriNavmani A , Karthikeyan Mitran Cc: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260729-axiado-ax3000-sgpio-controller-v2-0-976f4ed11438@axiado.com> <20260729-axiado-ax3000-sgpio-controller-v2-1-976f4ed11438@axiado.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 29/07/2026 09:02, Petar Stepanovic wrote: > +description: | > + The Axiado SGPIO controller provides a serial GPIO expansion interface > + that multiplexes multiple GPIO signals over a small set of physical lines. > + > + The controller operates as a shift-based interface, where output values > + are serialized on a data output line and input values are sampled from a > + data input line in synchronization with a shift clock. A latch signal is > + used to update output states after each transfer cycle. > + > + The interface uses data output (DOUT), data input (DIN), shift clock > + (SCLK), and latch signal (LATCH). > + > + Each SGPIO position provides one fixed-direction input GPIO and one > + fixed-direction output GPIO. Input GPIOs support edge-triggered > + interrupts. > + > + GPIOs are organized in banks of 32 signals, with registers controlling > + output values, input sampling, and interrupt status. The number of GPIO > + lines depends on the hardware variant. > + > + The controller detects changes on input GPIOs. Interrupt events are > + aggregated and signaled through a single interrupt line to the parent > + interrupt controller. > + > + Register access is performed over the APB bus. The SGPIO shift clock is > + derived from the APB clock using a programmable divider. > + > +properties: > + compatible: > + enum: > + - axiado,ax3000-sgpio > + - axiado,ax3005-sgpio > + > + reg: > + maxItems: 1 > + > + clocks: > + description: > + APB clock used for register access and SGPIO shift clock generation > + maxItems: 1 > + > + bus-frequency: > + description: SGPIO shift clock frequency in Hz > + minimum: 1 Such property is not allowed. Why you cannot calculate it automatically? > + > + gpio-controller: true > + > + '#gpio-cells': > + const: 2 > + > + interrupt-controller: true > + > + '#interrupt-cells': > + const: 2 > + > + interrupts: > + maxItems: 1 > + > + ngpios: > + description: > + Number of SGPIO positions. Each position provides one input GPIO and > + one output GPIO. > + enum: [128, 512] > + > +allOf: > + - if: > + properties: > + compatible: > + const: axiado,ax3000-sgpio > + then: > + properties: > + ngpios: > + const: 128 else what? 3005 has 512? Then these are implied by compatible, no? > + > +required: > + - compatible > + - reg > + - clocks > + - bus-frequency > + - gpio-controller > + - '#gpio-cells' > + - interrupt-controller > + - '#interrupt-cells' > + - interrupts > + - ngpios > + > +additionalProperties: false > + > +examples: > + - | > + #include > + > + sgpio@a000 { git grep sgpio@ No results (except well known poor coding style platform). I already commented on this. > + compatible = "axiado,ax3005-sgpio"; > + reg = <0xa000 0x800>; > + clocks = <&apb_clk>; > + bus-frequency = <1000000>; > + gpio-controller; Best regards, Krzysztof