From patchwork Wed Sep 27 16:25:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrizio Castro X-Patchwork-Id: 727039 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B023E82CB1 for ; Wed, 27 Sep 2023 16:25:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231490AbjI0QZW (ORCPT ); Wed, 27 Sep 2023 12:25:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229880AbjI0QZW (ORCPT ); Wed, 27 Sep 2023 12:25:22 -0400 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id A474A91; Wed, 27 Sep 2023 09:25:20 -0700 (PDT) X-IronPort-AV: E=Sophos;i="6.03,181,1694703600"; d="scan'208";a="181181547" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 28 Sep 2023 01:25:20 +0900 Received: from mulinux.home (unknown [10.226.92.108]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id DD4FE401F564; Thu, 28 Sep 2023 01:25:15 +0900 (JST) From: Fabrizio Castro To: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Geert Uytterhoeven Cc: Fabrizio Castro , Magnus Damm , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Chris Paterson , Biju Das , Lad Prabhakar Subject: [PATCH v2 1/2] spi: renesas,rzv2m-csi: Add CSI (SPI) target related property Date: Wed, 27 Sep 2023 17:25:07 +0100 Message-Id: <20230927162508.328736-2-fabrizio.castro.jz@renesas.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230927162508.328736-1-fabrizio.castro.jz@renesas.com> References: <20230927162508.328736-1-fabrizio.castro.jz@renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org The CSI IP found inside the Renesas RZ/V2M SoC can also work in SPI target mode. When working in target mode, the IP will make use of the SS (Slave Selection) pin, with "low" as default active level. The active level of SS can be changed to "high" upon setting property "spi-cs-high" to true. By default, the SS will be used in target mode, unless property "renesas,csi-no-ss" is set to true, in which case data will be shifted in and out purely based on clock activity, and the logic level of the SS pin will be completely ignored. Signed-off-by: Fabrizio Castro Reviewed-by: Rob Herring --- v1->v2: I have dropped properties renesas,csi-ss and renesas,csi-ss-high. I have added property renesas,csi-no-ss, and to configure SS as active high one now needs to use property spi-cs-high. I have also reworded the changelog to use a more modern terminology (host and target as opposed to master and slave). .../devicetree/bindings/spi/renesas,rzv2m-csi.yaml | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml b/Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml index e59183e53690..bed829837df1 100644 --- a/Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml +++ b/Documentation/devicetree/bindings/spi/renesas,rzv2m-csi.yaml @@ -39,6 +39,12 @@ properties: power-domains: maxItems: 1 + renesas,csi-no-ss: + type: boolean + description: + The CSI Slave Selection (SS) pin won't be used to enable transmission and + reception. Only available when in target mode. + required: - compatible - reg @@ -50,6 +56,9 @@ required: - '#address-cells' - '#size-cells' +dependencies: + renesas,csi-no-ss: [ spi-slave ] + unevaluatedProperties: false examples: