From patchwork Tue Oct 12 06:17:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Stein X-Patchwork-Id: 1539577 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=tq-group.com header.i=@tq-group.com header.a=rsa-sha256 header.s=key1 header.b=fQaG+bhb; dkim=pass (2048-bit key) header.d=tq-group.com header.i=@tq-group.com header.a=rsa-sha256 header.s=key1 header.b=GC4vQp5f; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4HT57K2g3rz9sX3 for ; Tue, 12 Oct 2021 17:17:49 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232813AbhJLGTs (ORCPT ); Tue, 12 Oct 2021 02:19:48 -0400 Received: from mx1.tq-group.com ([93.104.207.81]:3020 "EHLO mx1.tq-group.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231190AbhJLGTr (ORCPT ); Tue, 12 Oct 2021 02:19:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1634019466; x=1665555466; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=YpFcZBAr+S3nQ054+3YBdSJLgE6Lh4TGi48Xh5Pas+I=; b=fQaG+bhbIruEKWoIjkbwXfKZg6TR9ADlJ1kOQMbjwJtCkdkkRKtdUDy7 AyC7UoBfzKFMR9KxFu53u+EDeOEs5FLD9gb1Wg9er1O69VsiaYqIAOnGK pKn+x/DcQ8hYltZMACLELCRR/dXa2ySL9N4Tm5V695pgHAsr6O5Nb8DCY jf+Z4O8uc6z6WhKtl1LrjlU+aQbpAV18yOD03RtXN8zK7g85VCg8LWT/w cOzrBlUgGgSDDfzd3V08SaEiKwxnYDYZ+0l33yPZZFhQdbfYKeFUtJvzp T4t3JRUVy+Rz6p7Clndl5zMYoMU79lTVKa8YK8BoTSrG0sbZU3JPgoPOp w==; X-IronPort-AV: E=Sophos;i="5.85,366,1624312800"; d="scan'208";a="19984096" Received: from unknown (HELO tq-pgp-pr1.tq-net.de) ([192.168.6.15]) by mx1-pgp.tq-group.com with ESMTP; 12 Oct 2021 08:17:45 +0200 Received: from mx1.tq-group.com ([192.168.6.7]) by tq-pgp-pr1.tq-net.de (PGP Universal service); Tue, 12 Oct 2021 08:17:45 +0200 X-PGP-Universal: processed; by tq-pgp-pr1.tq-net.de on Tue, 12 Oct 2021 08:17:45 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1634019465; x=1665555465; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=YpFcZBAr+S3nQ054+3YBdSJLgE6Lh4TGi48Xh5Pas+I=; b=GC4vQp5fIftm/llfBYmJM/aZaYfpmCbAmCWUeqnq+8OGw6tZmjDNBC/q 5nMzIX3+0wzrVJzShrJ0NxRSm2JcpBuBm9fKSYa2zARVoZBb8t7JSlLMk 89mQvaEGmVeyOy+wB7QdiQ5BLqzHMdJl6WfWmhy9BPMX8sl8aeLCjaA0R Yns8PahskYcYelgV+/uUvvbgaAgqbfZXcBQMGiLrR2P/YuF59Co/5JxYm ol3KQv3BEagp8RZZTIvQIzFzkM8WsEi+iGyGP6luGWEyMl7aELK8aSgQN FQE9z1t5Mf3XpJxwFKumcmwy+F9vOBn8SMF2ECaH5HPY7wJ7Y2GpCKD2p A==; X-IronPort-AV: E=Sophos;i="5.85,366,1624312800"; d="scan'208";a="19984095" Received: from vtuxmail01.tq-net.de ([10.115.0.20]) by mx1.tq-group.com with ESMTP; 12 Oct 2021 08:17:45 +0200 Received: from steina-w.tq-net.de (unknown [10.123.49.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by vtuxmail01.tq-net.de (Postfix) with ESMTPSA id 4AE7F280065; Tue, 12 Oct 2021 08:17:45 +0200 (CEST) From: Alexander Stein To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Pratyush Yadav , Michael Walle , Tudor Ambarus Cc: Alexander Stein , linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] dt-bindings: mtd: spi-nor: Add output-driver-strength property Date: Tue, 12 Oct 2021 08:17:03 +0200 Message-Id: <20211012061704.284214-1-alexander.stein@ew.tq-group.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This property is for optimizing output voltage impedance and is specific to each board. It overwrites the default set by the flash device. Various flash devices support different impedances. Signed-off-by: Alexander Stein --- Changes in v2: * Updated the property description and the commit message accordingly Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml index ed590d7c6e37..4c3c506a8853 100644 --- a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml +++ b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml @@ -72,6 +72,14 @@ properties: be used on such systems, to denote the absence of a reliable reset mechanism. + output-driver-strength: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Output driver strength in ohms which optimizes the impedance at Vcc/2 + output voltage. This property overwrites the default set by the flash + device. This is board specific and should be determined by the + manufacturer. Various flash devices support different impedances. + label: true partitions: