From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 EB990165F16; Tue, 7 Oct 2025 09:39:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759829952; cv=none; b=Zqs3vsyul4YFBbD1MkUTUJOtPE5BL2/lJ4uXNaFRT2N/0qEtqm+LQMCwoNsakfoemIq1cYzOngexlILYbt1yNyWQ38au+DS6Rjw6w00GWvbyTYwS/jPMrjZmHgOMmTFHLnC5+5reKmdQHwhPZvJ3/PASQSdoKOawdTrpkGrBGQw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759829952; c=relaxed/simple; bh=Y4EXS4AlfGJ1lns+hS2c1t6Y+szkd/o4CvJQriKDRbw=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=fBujoy5fm0B24/dSAhCnjniQNCLO7jEX9XwaABJxoTyp8JP9O0uELzjh+YD9yJ6HW1S18M9G8ZqKEqEVt+mX6DTqxeS5233ktksX3wX8ZyXWHlsLnsqBviccWOiU6dXumEMwqc2vptmFD+b0Q+rJCJ1DiIT/qlSBhJiwIzRVIL4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l+f0gmOv; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="l+f0gmOv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 445ABC4CEF1; Tue, 7 Oct 2025 09:39:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1759829951; bh=Y4EXS4AlfGJ1lns+hS2c1t6Y+szkd/o4CvJQriKDRbw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=l+f0gmOv6IAt8WHDh81BJb2zC7zknFHSRJcTkXW64CL4hCBz/CqGEbIp7dCizAaD4 wx6vnBbAvNaFwgfk+2N2r66e44nJGRBLe4QRoaqbTfsGMQQoEH4GO40u4FO1FNdqoR QRqbIHI523lN6Ka7WGYeYweKKf2y/vupCUzgfkB5PI7r2MKGnlOWnyAjGRjjhivJp9 ZrOdtrP3LOxiIGAHzfkTbIITSpcnCC37kqSF9MVPiM1kwH7i3qqmf4PRl2XfOW8K+8 fFs1SuWd8hqDoM4Ok5ZcJ7LdUJZRNE+BSVRKOmHzLXRECghqLP3Farme2mX/UR7d+B EW2nofvQ/0/rQ== Message-ID: <1561d6f5-bc60-4b41-aef5-3e22a23ee133@kernel.org> Date: Tue, 7 Oct 2025 18:39:07 +0900 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] dt-bindings: counter: Add new ti,omap-dmtimer-cap compatible To: Gokul Praveen , j-keerthy@ti.com, vigneshr@ti.com, wbg@kernel.org, linux-kernel@vger.kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org Cc: u-kumar1@ti.com, n-francis@ti.com References: <20250909080042.36127-1-g-praveen@ti.com> <20250909080042.36127-2-g-praveen@ti.com> <6faff5b1-65b1-41ee-aba8-8c06a2bc6f58@kernel.org> <9653740a-44fe-46bb-92c8-f7fc26cbe5ee@ti.com> <30101fb9-e2eb-4050-896a-7be629ced44d@kernel.org> <2de3151b-eedc-4209-8b20-53473cafacef@ti.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 07/10/2025 18:23, Gokul Praveen wrote: > Hi Krzysztof, > > > On 07/10/25 12:05, Krzysztof Kozlowski wrote: >> On 26/09/2025 18:06, Gokul Praveen wrote: >>>> >>>>> + >>>>> + ti,timers: >>>>> + description: Timer instance phandle for the Capture >>>> >>>> So the only resource is phandle? That's completely fake device then. NAK. >>>> >>> >>> >>> The OMAP Timer IP can operate in 3 modes: Timer, PWM mode or capture >>> (mutually exclusive). >>> The timer/ti,timer-dm.yaml file describes the timer mode of operation. >>> It encapsulates base IP block and reg property is also part the same >>> binding. >>> >>> This node represents the capture mode with phandle reference to the >>> timer DT node. This is modeled all the same lines as how PWM >>> functionality is implemented in pwm/ti,omap-dmtimer-pwm.yaml >> >> Different modes do not have their own device nodes. It is still one >> device, so one device node. >> >>> >>> Now, if this needs to change, please suggest alternate. >>> >>> One solution is perhaps to add a new property to ti,timer-dm.yaml itself >>> to indicate the mode of IP? >> >> Not sure, depends what this really is and how it is used. I can also >> imagine that consumer defines the mod of operation. >> > > For a timer operating in capture mode, there are no consumers actually > and the only way we use it is through sysfs. > > Would it be good enough if I have a separate "mode" property for the > dmtimer device node just like how it is done for USB as follows where > the usb device node has a "dr_mode" property to decide on whether the > usb should act in host, device or otg mode. No, because of all my other comments in previous email. Best regards, Krzysztof