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Received: from sea.source.kernel.org ([172.234.252.31]) by desiato.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uRTS6-00000003m4I-39vz; Tue, 17 Jun 2025 10:22:05 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id F0356440D5; Tue, 17 Jun 2025 10:21:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8EC44C4CEE3; Tue, 17 Jun 2025 10:21:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1750155717; bh=vHcf4VFbrCSFj347QsP8KTvvWwno+mCruZnJ7njeA4M=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=lHAq2dRxzfPR/f4Y/bT3gv50k7gbevCTDpCjdFaZah/itIoTTzs0NrQfljos3bGU6 rqUvwhe1ml6wJI7K9G0RoZ2VF9kCG/HZpO/fsw4gtAMJVRWX9ngSDJO+eNiFxIOfrY XAVcVUXz0AnaUA7N78TM2/FQ08lQEUML7rLyOGRaOvRKWzYJCgBhF3oNKO/8K7Rx9x V175pq8Txvg54WKgdcK2sLJEXHe4q/kDYXIOOF5Bv2eFOILfKILRZtMhAhypR4aQVQ mFE0UO5IOZgL1dQW78ZHYcJ1HeSM3omvp0ANomXwdhE2xAwSy+fUzd3zDim1IRPGPd vokZv3tsCGdDg== Message-ID: <704d75df-a484-4da3-9bcb-85b480e2ecf0@kernel.org> Date: Tue, 17 Jun 2025 12:21:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/4] dt-bindings: mfd: rk806: allow to customize PMIC reset mode To: Quentin Schulz , Quentin Schulz Cc: Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner , Sebastian Reichel , Lukasz Czechowski , Daniel Semkowicz , Nicolas Frattaroli , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org References: <20250605-rk8xx-rst-fun-v2-0-143d190596dd@cherry.de> <20250605-rk8xx-rst-fun-v2-1-143d190596dd@cherry.de> <20250617-small-vivacious-labrador-7f0eb0@kuoka> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250617_112203_236017_4227F688 X-CRM114-Status: GOOD ( 28.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 17/06/2025 11:38, Quentin Schulz wrote: > Hi Krzysztof, > > On 6/17/25 10:08 AM, Krzysztof Kozlowski wrote: >> On Thu, Jun 05, 2025 at 05:41:06PM GMT, Quentin Schulz wrote: >>> + rockchip,reset-mode: >>> + $ref: /schemas/types.yaml#/definitions/uint32 >>> + enum: [0, 1, 2] >>> + description: >>> + Mode to use when a reset of the PMIC is triggered. >>> + >>> + The reset can be triggered either programmatically, via one of >>> + the PWRCTRL pins (provided additional configuration) or >>> + asserting RESETB pin low. >>> + >>> + The following modes are supported (see also >>> + include/dt-bindings/mfd/rockchip,rk8xx.h) >>> + >>> + - 0 (RK806_RESTART) restart PMU, >>> + - 1 (RK806_RESET) reset all power off reset registers and force >>> + state to switch to ACTIVE mode, >>> + - 2 (RK806_RESET_NOTIFY) same as RK806_RESET and also pull >>> + RESETB pin down for 5ms, >>> + >>> + For example, some hardware may require a full restart >>> + (RK806_RESTART mode) in order to function properly as regulators >>> + are shortly interrupted in this mode. >>> + >> >> This is fine, although now points to missing restart-handler schema and >> maybe this should be once made common property. But that's just >> digression, nothing needed here. >> >>> vcc1-supply: >>> description: >>> The input supply for dcdc-reg1. >>> diff --git a/include/dt-bindings/mfd/rockchip,rk8xx.h b/include/dt-bindings/mfd/rockchip,rk8xx.h >>> new file mode 100644 >>> index 0000000000000000000000000000000000000000..f058ed1ca661185f79738a358aa2d4f04539c590 >>> --- /dev/null >>> +++ b/include/dt-bindings/mfd/rockchip,rk8xx.h >>> @@ -0,0 +1,17 @@ >>> +/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */ >>> +/* >>> + * Device Tree defines for Rockchip RK8xx PMICs >>> + * >>> + * Copyright 2025 Cherry Embedded Solutions GmbH >>> + * >>> + * Author: Quentin Schulz >>> + */ >>> + >>> +#ifndef _DT_BINDINGS_MFD_ROCKCHIP_RK8XX_H >>> +#define _DT_BINDINGS_MFD_ROCKCHIP_RK8XX_H >>> + >>> +#define RK806_RESTART 0 >>> +#define RK806_RESET 1 >>> +#define RK806_RESET_NOTIFY 2 >> >> I do not see how this is a binding. Where do you use this in the driver >> (to be a binding because otherwise you just add unused ABI)? >> > > Explained in the commit log of the driver patch: > > """ > This adds the appropriate logic in the driver to parse the new > rockchip,reset-mode DT property to pass this information. It just > happens that the values in the binding match the values to write in the > bitfield so no mapping is necessary. > """ > > I can add useless mapping in the driver if it's preferred. I had the No, I comment and raise questions when you add ABI which is neither ABI or should not be ABI. > impression that simply using a hardcoded value in the DT binding and > then writing it to the register was not desired, so the constant is now > here to make this less obscure from DT perspective though I'm still > writing the value directly in the register. If hardcoded values are ok > in the binding, then I can remove that header file. If you want something user readable, make it an enum string or keep the header within DTS. If I review it like that, it will be brought to me next time for some other patch saying that commit was reviewed so I can do the same. [1] Therefore since I object against unused binding headers in general (there is no user here technically), I need to object here as well. :( https://lore.kernel.org/all/0d381ad0-85d4-43de-a050-3b9ed03bf5d8@kernel.org/ Best regards, Krzysztof