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 B8D471E0DD7; Mon, 21 Oct 2024 07:50:51 +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=1729497051; cv=none; b=MpkfQMpArNzZxmBjfg4VYavDnABXILRfksulDBVrjdxBkNFu7EV7oLMqVlbekn5EYSFyS6R2uNVeEz44rzHFoT4xqZC5dDWjM7oNL8f71a57jYObtmApWp0meM4N/xceN6/AfdWyR4Y67YjrdaAgWhuT3H6N2hnfAm4j0r3Kjy8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729497051; c=relaxed/simple; bh=5yG1wAUGt/ltY2yssfS8ZkIcj1BmS/igZ8q9ZvX+qCA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Lh9pO/vvn3o8y0W/nfJek/guCcLM2Zs7VQaRRRnlDu+KWa48ANAGw09/1gDyyn31PRlyEu8OeCeR6ONLiPJGyHlRvf2qyk9DghpRCPcCtWQPo8g3EKxuadVihq6dit2QC8fl6NITwWK7U/urojxQYe4pnixWw1WZJQMlWZA0SLY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tN4Rl7Jf; 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="tN4Rl7Jf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3ECA4C4CEC3; Mon, 21 Oct 2024 07:50:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729497051; bh=5yG1wAUGt/ltY2yssfS8ZkIcj1BmS/igZ8q9ZvX+qCA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=tN4Rl7JfV8AzD26b8U3sBe9Ud+AlD5PCsT1c/FiXxb9a3LsIVnLKfxbamrTl7f0ML U3MBOVQCQH2rxywGWVk0acPs6qZyra1JAMtIpoxwHB9tb9Sr9vTSuG/7CpwZCYLa0H L1x35Tnrx1y8X8DwUl9NgV3LOszGfQojQpaDrHj0uebncjy1SPqU50HIpo1rx2v1w6 F5F126ViY2CR0Ie5H+sxbfSJqoZbv4MQnDmvTFkqNTl1mCYaLJiP0q3WqlFDCWxF5T mn/l+9+0I4xY90BHNfW8Wk/ybC2qE7uWKfaicHAbljDoTX4k9TRUWTr6g0s0/zEqhW 7VIuqXNZrQuog== Message-ID: Date: Mon, 21 Oct 2024 09:50:42 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] dt-bindings: net: bluetooth: nxp: add support for supply and reset To: Marco Felsch Cc: POPESCU Catalin , Sherry Sun , Amitkumar Karwar , Neeraj Sanjay Kale , "marcel@holtmann.org" , "luiz.dentz@gmail.com" , "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , "p.zabel@pengutronix.de" , "linux-bluetooth@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , GEO-CHHER-bsp-development References: <20241004113557.2851060-1-catalin.popescu@leica-geosystems.com> <3fa35cd2-e52c-4873-8a7f-db459b016a97@kernel.org> <2b7f61a8-e91a-4b32-be1d-753a19e4d81f@leica-geosystems.com> <0d460226-4ea7-4a9b-a119-468343727996@kernel.org> <20241021064129.trchqa2oickna7pc@pengutronix.de> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 21/10/2024 08:41, Marco Felsch wrote: > On 24-10-07, Krzysztof Kozlowski wrote: >> On 07/10/2024 14:58, POPESCU Catalin wrote: >>>>>> >>>>>> + vcc-supply: >>>>>> + description: >>>>>> + phandle of the regulator that provides the supply voltage. >>>>>> + >>>>>> + reset-gpios: >>>>>> + description: >>>>>> + Chip powerdown/reset signal (PDn). >>>>>> + >>>>> Hi Catalin, >>>>> >>>>> For NXP WIFI/BT chip, WIFI and BT share the one PDn pin, which means that both wifi and BT controller will be powered on and off at the same time. >>>>> Taking the M.2 NXP WIFI/BT module as an example, pin56(W_DISABLE1) is connected to the WIFI/BT chip PDn pin, we has already controlled this pin in the corresponding PCIe/SDIO controller dts nodes. >>>>> It is not clear to me what exactly pins for vcc-supply and reset-gpios you describing here. Can you help understand the corresponding pins on M.2 interface as an example? Thanks. >>> >>> Hi Sherry, >>> >>> Regulators and reset controls being refcounted, we can then implement >>> powerup sequence in both bluetooth/wlan drivers and have the drivers >>> operate independently. This way bluetooth driver would has no dependance >>> on the wlan driver for : >>> >>> - its power supply >>> >>> - its reset pin (PDn) >>> >>> - its firmware (being downloaded as part of the combo firmware) >>> >>> For the wlan driver we use mmc power sequence to drive the chip reset >>> pin and there's another patchset that adds support for reset control >>> into the mmc pwrseq simple driver. >>> >>>> Please wrap your replies. >>>> >>>> It seems you need power sequencing just like Bartosz did for Qualcomm WCN. >>> >>> Hi Krzysztof, >>> >>> I'm not familiar with power sequencing, but looks like way more >>> complicated than reset controls. So, why power sequencing is recommended >>> here ? Is it b/c a supply is involved ? >> >> Based on earlier message: >> >> "For NXP WIFI/BT chip, WIFI and BT share the one PDn pin, which means >> that both wifi and BT controller will be powered on and off at the same >> time." >> >> but maybe that's not needed. No clue, I don't know the hardware. But be >> carefully what you write in the bindings, because then it will be ABI. > > We noticed the new power-sequencing infrastructure which is part of 6.11 > too but I don't think that this patch is wrong. The DT ABI won't break > if we switch to the power-sequencing later on since the "reset-gpios" > are not marked as required. So it is up to the driver to handle it > either via a separate power-sequence driver or via "power-supply" and > "reset-gpios" directly. That's not the point. We expect correct hardware description. If you say now it has "reset-gpios" but later say "actually no, because it has PMU", I respond: no. Describe the hardware, not current Linux. Best regards, Krzysztof