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 8D965382299; Wed, 2 Sep 2026 18:03:45 +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=1788372226; cv=none; b=gp5ImR+lWct7eYEpvTF4+f8KSJMihVxEcihmnh9rhL/TARxM9Srual0LOnzxZu57lbtLbEh1roX9yD8u+ojeuMHPM3XcaX3erHZvm1cfUhFCaehShfP1yTuLI55sriz+L4CjZTepej7txa3x8dgIFE0uUpoLL5Q0DORLMfeXfXY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788372226; c=relaxed/simple; bh=U0DQvdMBxlrrrjlvjwHNoQY0+Gbfmq4eCEwuD81yDYU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=rzzobXqNZPdmLH1JfvF52XtM2wOlfmIcurOLX/HlbItnCZkjlpwCCA+ojBVMxwUpyz++eM1D8GPgTsvuofehzDfO8q47HVOtaIsJlmWVf3EdfptLyysmS/w1wtvqvovZxD/dAsGSBO0TbiwEHMDsbXELWiLrHkHDNhzjuH4hCuo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YryQdOG6; 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="YryQdOG6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA8A41F000E9; Wed, 2 Sep 2026 18:03:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788372225; bh=Uj9/RDwv9k2iRrF8z8+r037C19R/tl/T6HaynuHBg7Q=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=YryQdOG6rCS+CoxXuEhmKqZdD8O0bh7F0WgNxh8InFZjr/iLSM0valYUf4rdXM5E6 Vxe3whVlTKMY0QPvSa04XFtUlbX8YsISoVn3NrW+crTxg88qsYsTr3tnLISd4Kd8Dt iYtrHEj2YTmG3kJJLChg+lb7XBELtrMweBQCCo7iZ7+muXc64rjY96EBBYmH/+R6ie NwZVU3R9XH//x33Z0hYhHJPSQgGQgNRvyr5CmG+ouEnbkdMnmMRfgYhJMMsAhhnpiT jMljJ/6L/ziJe6kbaA5W9kRZrJn7mcUOgv+T88DR0r/Pk39Ub4KzjoNcLcZbgbgdgO 1DQu/IxJCAB5w== Date: Wed, 2 Sep 2026 19:03:40 +0100 From: Conor Dooley To: Yixun Lan Cc: Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Adrian Hunter , Long Wan , linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/4] dt-bindings: mmc: spacemit,sdhci: Add tx delay property Message-ID: <20260902-crept-player-b3f30ab4e6f6@spud> References: <20260902-07-k3-sdhci-dts-v1-0-4e7909cf4233@kernel.org> <20260902-07-k3-sdhci-dts-v1-2-4e7909cf4233@kernel.org> 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="JPvI9JMjjGIUeUlx" Content-Disposition: inline In-Reply-To: <20260902-07-k3-sdhci-dts-v1-2-4e7909cf4233@kernel.org> --JPvI9JMjjGIUeUlx Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Sep 02, 2026 at 07:03:13AM +0000, Yixun Lan wrote: > From: Long Wan >=20 > Introduce a vendor specific property to configure the step count of TX > delay line which should be applied before RX tuning, compensating for > board level trace differences. The TX delay line result comes from test > out of real board which vary from different hardware layout. >=20 > Signed-off-by: Long Wan > Signed-off-by: Yixun Lan Everyone seems to have their own custom delays, so what's another.. Acked-by: Conor Dooley pw-bot: not-applicable > --- > Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml | 10 ++++++++++ > 1 file changed, 10 insertions(+) >=20 > diff --git a/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml b/= Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml > index f35bf7ce08dd..3399a2d076dc 100644 > --- a/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml > +++ b/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml > @@ -63,6 +63,16 @@ properties: > pinctrl-1: > description: Optional pinctrl state for 1.8V UHS operation with "uhs= " name > =20 > + spacemit,tx-delay: > + $ref: /schemas/types.yaml#/definitions/uint32 > + minimum: 0 > + maximum: 255 > + description: > + TX delay line setting applied before RX tuning, compensating for > + board level trace differences. This is a delay line step count with > + no fixed time-per-step conversion; determined empirically per board > + specific, used on SD/SDIO hosts. > + > required: > - compatible > - reg >=20 > --=20 > 2.55.0 >=20 --JPvI9JMjjGIUeUlx Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRh246EGq/8RLhDjO14tDGHoIJi0gUCaphk/AAKCRB4tDGHoIJi 0po+AQCA6PqLcTKT7imRX8EmzXyV4cbV44EdaTRHvitAdUV6IgD/ViMPsvHGYEO1 7Ph5zn0Vyp3Oo8iHwbyKP3VfMdWVMQg= =fS0X -----END PGP SIGNATURE----- --JPvI9JMjjGIUeUlx--