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 2EFD0364933; Thu, 23 Jul 2026 16:03:07 +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=1784822590; cv=none; b=ikFnyClMwW7oz6ZA1LAwlaNsndb0bmuGeFw5SAOONgkjfXI+HaY+mYc+oSRPmAeW7xhl93bKZF1CbEgIw+LaR6jHmGmfk6JYlPMhP1zt+hu8g1pHsVFfBCM7N7BBeSEo+x8Ca6V2q+21ZbcyZlmcwt14FbksPmKwC4vEz72ks7U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784822590; c=relaxed/simple; bh=VX40IOg2m9R6OtmuKe98ovEWZ8IBRZC5MbBvpVgZasI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=aLDlrfGDG8yly82btnRe0YSaKgmh4l5qGhsbCV6suvBE+h4KENFbcw//MmFM04yrB2rUhVXu41XNDBvvarEuyHuUEo52bP9XDm0hx/ixs+Z2Xs4mSP5zQ9+GJBpnNmxxqcJQGB0K1pkrffnoIOqRkqIw9SyZyiRqTd9Rm8iq2+0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dz7A4txv; 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="dz7A4txv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9741D1F000E9; Thu, 23 Jul 2026 16:03:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784822585; bh=VX40IOg2m9R6OtmuKe98ovEWZ8IBRZC5MbBvpVgZasI=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=dz7A4txvtz95r11j8oExGjEEvtX+SCb6dus1NYolYEItFL4Cb9Rbz2koL5LnbSnaA UqTCaqhVbmKCG1h3EMPXMx59EISHhQ0QnIUvF/eD+UBjNsP7gcOcg7txVxay7H0Bof F1Ko+/RVAevfyLO7r5sgSjU9YW7g7+eAaQYxqb6SUflYq3Z7/7PC416MqFsJctUhak jBu90oCh2LF0toC+wwVJ7cjNgXZAZL/E/BB6sHJgWtSvWl0F6pJX364sxDQp3Lk0qv P8j5xcjN8wfR/0XGxveqC3P/8FkETtjJU91nnZAELkcjan//A3IPkUCAA+cfgzPmGt ecrJcgd746oiw== Date: Thu, 23 Jul 2026 17:02:42 +0100 From: Conor Dooley To: Laurent Pinchart Cc: Richard Leitner , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Dave Stevenson , Alexander Stein , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, driver-core@lists.linux.dev Subject: Re: [PATCH RFC 1/2] dt-bindings: regmap: add common schema for no-sequential-read Message-ID: <20260723-hamster-juniper-5697cacade96@spud> References: <20260722-regmap-single-read-v1-0-aaaf31591669@linux.dev> <20260722-regmap-single-read-v1-1-aaaf31591669@linux.dev> <20260722201622.GD648629@killaraus.ideasonboard.com> <525338f4-cad3-4acb-94c5-a4b71cde9c02@sirena.org.uk> <20260723154541.GA764516@killaraus.ideasonboard.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="XY5rrJ73sw2k5tIT" Content-Disposition: inline In-Reply-To: <20260723154541.GA764516@killaraus.ideasonboard.com> --XY5rrJ73sw2k5tIT Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jul 23, 2026 at 06:45:41PM +0300, Laurent Pinchart wrote: > On Thu, Jul 23, 2026 at 01:01:11PM +0200, Richard Leitner wrote: > > On Wed, Jul 22, 2026 at 11:03:09PM +0100, Mark Brown wrote: > > > On Wed, Jul 22, 2026 at 11:58:46PM +0200, Richard Leitner wrote: > > >=20 > > > > @Mark: I understood that if the fpga really intercepts the I2C bus,= it > > > > should be modelled accordingly in device tree. But what would be the > > > > preferred implementation if both devices sit on the same I2C bus, b= ut > > > > one is messing up some register reads on purpose? > > >=20 > > > I think we would need to have a coherent understanding and description > > > of the actual issue to know how to describe it. > >=20 > > Understood. I will try to figure out how the hardware is really wired > > and come back to you. >=20 > Based on the information I have received so far, the FPGA is interposed > between the host and sensor. It could therefore be modelled in DT as > child of the I2C bus and a parent of the sensor. >=20 > New version of some of the Vision Components modules have fixed the > multi-read bug, so we will still need a property in the FPGA DT node to > indicate if the quirk should be activated. Or come up with a compatible for the FPGA DT node that uniquely identifies the revision of the RTL in use. That's my preference for things that use some custom RTL that aren't configuration parameters. >=20 > > > Please do not add random characters to my name. > >=20 > > Sorry, I didn=E2=80=99t mean any harm. >=20 > --=20 > Regards, >=20 > Laurent Pinchart --XY5rrJ73sw2k5tIT Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRh246EGq/8RLhDjO14tDGHoIJi0gUCamI7IQAKCRB4tDGHoIJi 0pDjAQCCkxMHtYm0qaav7zMioSvLLMQb9aX8A5aBIFfQ0YnkJwEA96ezgJWQxhQ9 dHDDsCd7WMlhBZHxaOkLxA4g0TN34w0= =cFk7 -----END PGP SIGNATURE----- --XY5rrJ73sw2k5tIT--