From nobody Tue Apr 7 05:44:52 2026 Received: from mail11.truemail.it (mail11.truemail.it [217.194.8.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D953351C0F; Mon, 16 Mar 2026 07:36:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.194.8.81 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773646567; cv=none; b=iXr/DofpJPWs2Ys50yayfV6kzBNz6CrylOsVL/lVkwQ4DaoGTITs+rj3c0Yes5YIArWtWppp9l2HtG5hs2IlHnFwz/ahIO+SqOiUKSwT47yHOdoSTOoFMYAVth5c2gw534A6f4vNVkXRRkYxkSYrOxg7mNUQ+rejprXhaOxfofI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773646567; c=relaxed/simple; bh=i9G8Rg1+TjfLhsd03fYMcNLQQ3/2L7IYPr+k3rDLhdo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Riv3m5rQp2tP+MJ19572iSUKhs5grCYgVItZHpeWhHK0XQlGAfPNemKaoFH1rrmEBrM0G6vFaOXQH/4x2PUwL8HkNwRp+QiZfz60X06OQF6+Lhb/90+iRR8ZvPMwCaEPLjTfi1wu3whrQazHGRqqnH+/TcD+4up7SzlfXc74Bxg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it; spf=pass smtp.mailfrom=dolcini.it; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b=ilqrx0EE; arc=none smtp.client-ip=217.194.8.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=dolcini.it Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b="ilqrx0EE" Received: from francesco-nb.corp.toradex.com (248.201.173.83.static.wline.lns.sme.cust.swisscom.ch [83.173.201.248]) by mail11.truemail.it (Postfix) with ESMTPA id 605D8206BF; Mon, 16 Mar 2026 08:35:56 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dolcini.it; s=default; t=1773646556; bh=napq9Fx6lEGxzTHyj3JDOT9mixqbcucMVlpnd28LYpQ=; h=From:To:Subject; b=ilqrx0EEsy7ynzaPT4ZZ1pxCyBf7uvIy+lVHO6fndYxmkdIh0qnE+kUz5rkux5Xr6 pjWGBLD4KLlas6i8UgN45Ky7cb3Y/JyTbYNpjdbnzcZuqJ/+cV2y462dHeths9+p84 ExXbnVQzOxoNW9EreAGozQq61z0W8jZVEetaggrL127GGZnPd0CSrpEzYk2oBmLYfy JId0TqhkNbjqfELmaPeMJNyxtYqnQjzcJigo+8HnRBhliBNmGGyxVb/V83MvjTHyk5 ZaqGInfwRNHXR/eIgWlIcLLodt14dB2dqVIeJy74RO6hvqQbUpLgZ6dTD29D28tKYl 9WADdlXMSy83A== From: Francesco Dolcini To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Mark Brown Cc: Francesco Dolcini , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org Subject: [PATCH v1 1/2] dt-bindings: trivial-devices: add spi-miso-mosi-loopback Date: Mon, 16 Mar 2026 08:35:43 +0100 Message-ID: <20260316073547.11437-2-francesco@dolcini.it> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260316073547.11437-1-francesco@dolcini.it> References: <20260316073547.11437-1-francesco@dolcini.it> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Francesco Dolcini Add a compatible to describe a single wire loopback between SPI MISO and MOSI signals. Link: https://lore.kernel.org/all/20260310133254.GA51497@francesco-nb/ Signed-off-by: Francesco Dolcini --- Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Docum= entation/devicetree/bindings/trivial-devices.yaml index a482aeadcd44..2cb973c157f6 100644 --- a/Documentation/devicetree/bindings/trivial-devices.yaml +++ b/Documentation/devicetree/bindings/trivial-devices.yaml @@ -432,6 +432,8 @@ properties: - socionext,uniphier-smpctrl # SparkFun Qwiic Joystick (COM-15168) with i2c interface - sparkfun,qwiic-joystick + # Single wire loopback between SPI MISO and MOSI signals + - spi-miso-mosi-loopback # STMicroelectronics Hot-swap controller stef48h28 - st,stef48h28 # Sierra Wireless mangOH Green SPI IoT interface --=20 2.47.3 From nobody Tue Apr 7 05:44:52 2026 Received: from mail11.truemail.it (mail11.truemail.it [217.194.8.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D78C3502A5; Mon, 16 Mar 2026 07:36:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.194.8.81 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773646568; cv=none; b=tDdoXFT6SG0lcsVXRorTyCdKvyoQAN5HTJT7QU5LysvowsfS+EJaMZFi5MA5zC2MEV8qVWYrBG1br0GIFXrSZ+wQthi4DxcHKTBay4mj8KEsPtMD2Ov6E5yOMg8L2BjYAj5dg7Oay82HKp2hy+IdjipzpAY7qdJ28f8mZZykNsM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773646568; c=relaxed/simple; bh=2ubS2qnPkPudQEnTuJ3t2t63NV81Kdy+xZzs1jM9VaM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ev74A6svLIq/bykpKw3ra9i+pQyZFFbVEsIlLmNzXGAr5lpaEqcOX+6SMiMbWp4YHstdLDJmCrSvRL4uoMjVJ5382jk1+l4BTfIlQsqISntvTpGOEzPdIr6gkA5KfE38p/xNSGM9PDyvbJn1LBTn4NOtI9FqSvkBBUyfqr3Dbgw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it; spf=pass smtp.mailfrom=dolcini.it; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b=LkozeCjE; arc=none smtp.client-ip=217.194.8.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=dolcini.it Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b="LkozeCjE" Received: from francesco-nb.corp.toradex.com (248.201.173.83.static.wline.lns.sme.cust.swisscom.ch [83.173.201.248]) by mail11.truemail.it (Postfix) with ESMTPA id C86B520735; Mon, 16 Mar 2026 08:35:56 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dolcini.it; s=default; t=1773646557; bh=jWspq/mVUrwz2X5u/LQpuWjjmowam1smt13kBCpMazw=; h=From:To:Subject; b=LkozeCjEFYbV0XUbpaFaXgbpgzU7jwK/53gftC5UPAUKgwUurlD8HwQSyElgRiGGj LNb/7crzcX9uBxSBJ0ASwVFV9qRm7tczsMk4l2aMQ9boKuDX/C7W9GzB0SsOh6pJnB SOQMtVN7ArjqrKbTE7PAS7EvupRCSpJrq8UO8B9dNdgChxycrIw1X/MBgFXr8v4h72 26RUSIUewozGcC5l3dInPnKctafSSV5ctOd4Q09bE67yZqAyw9UIuxd2V1r53vEZSl 0xZQJeW4COnqD6AGITDZ4gYWv1PFS8VSGhQTXfjXk8xW602CMnRQw5OGtcenkDh2W5 zlAcbdjZNcAiA== From: Francesco Dolcini To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Mark Brown Cc: Francesco Dolcini , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org Subject: [PATCH v1 2/2] spi: spidev: Add data loopback OF compatible Date: Mon, 16 Mar 2026 08:35:44 +0100 Message-ID: <20260316073547.11437-3-francesco@dolcini.it> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260316073547.11437-1-francesco@dolcini.it> References: <20260316073547.11437-1-francesco@dolcini.it> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Francesco Dolcini Add "spi-miso-mosi-loopback" OF compatible, that describes a single wire loopback between the two data signals, MISO and MOSI. This kind of setup can be used for testing the SPI functionality. Link: https://lore.kernel.org/all/20260310133254.GA51497@francesco-nb/ Signed-off-by: Francesco Dolcini --- drivers/spi/spidev.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c index 638221178384..3874fd449580 100644 --- a/drivers/spi/spidev.c +++ b/drivers/spi/spidev.c @@ -701,6 +701,7 @@ static const struct spi_device_id spidev_spi_ids[] =3D { { .name =3D /* semtech */ "sx1301" }, { .name =3D /* silabs */ "em3581" }, { .name =3D /* silabs */ "si3210" }, + { .name =3D "spi-miso-mosi-loopback" }, {}, }; MODULE_DEVICE_TABLE(spi, spidev_spi_ids); @@ -735,6 +736,7 @@ static const struct of_device_id spidev_dt_ids[] =3D { { .compatible =3D "semtech,sx1301", .data =3D &spidev_of_check }, { .compatible =3D "silabs,em3581", .data =3D &spidev_of_check }, { .compatible =3D "silabs,si3210", .data =3D &spidev_of_check }, + { .compatible =3D "spi-miso-mosi-loopback", .data =3D &spidev_of_check }, {}, }; MODULE_DEVICE_TABLE(of, spidev_dt_ids); --=20 2.47.3