From nobody Thu Oct 2 10:55:18 2025 Received: from smtpout-03.galae.net (smtpout-03.galae.net [185.246.85.4]) (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 0DCEB2F9C32; Thu, 18 Sep 2025 08:34:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.85.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758184452; cv=none; b=kecL2fUaRiPftmx2N7bUTVHO2q6ja2MyoDgBMp0rIXdRcxmpWPDA1iNGi5Po/tALRTu3/LvuD5yikVf1k+gg3HMQdCIKOu1yG5vL7uJdSv3Gfpt7ypg/jafgpJmkMUC7BGtPKgsY7wXKGuoM+BfOxpH6/HbWTGidUFiBdP+8R8M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758184452; c=relaxed/simple; bh=+Ahr5oNqxXsasI3EQWXo7mCLrNIvdckTiHF6ZxjDajA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=I4YjsgS4LVrXMJRFm4E1Bpd+4q/xeYkXE8cUVN3D/2SchlCTTyu5qFknLxM7xmeyc9wVhfNE1DuqC/1AOM/7IGPAl02XPPmUjASveAt4TTRs9yhmYhGCSQS3Q1F1hWoYdoMmg8EZuDN7H+ESQxqJLWOy78BnYqL+S9hYhK4+Hfs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=ACt1tF6s; arc=none smtp.client-ip=185.246.85.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="ACt1tF6s" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id BFA864E40D09; Thu, 18 Sep 2025 08:34:08 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 969506062C; Thu, 18 Sep 2025 08:34:08 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id A9F17102F1CBF; Thu, 18 Sep 2025 10:34:05 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1758184447; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=EY6yVymLZMeFS52uP2yzPDRoqRTf9+mNLzBhVGM2Bzs=; b=ACt1tF6s5DtutmaB8W/6DxpovK/rpF/26Te+HqVmJULQzZ2S7K3LWQDMeQ+NJpSrVucIZG 5fOVi9vjbsBuoqIYvWUnBZCO5j1JFQlUqTSW+0D5ZngqmWGctN11H3YqWoeWSQohv1zuLj 7Z/qEeNIMwkmqD+QwLYdEdekFcAsKHY78adlEjwg8+Wrx2Dw0OUTAeOY2wRdcqKJx5uVTV 8XBS0Q8xglxsnSp6/t2FsWc41SYs7NlY53o3DopcUV8SXI4q4YP+MiJb7PXQBvaBre6IRd nQnrCZ8KxrBIONpaMbvurn/yUd1iFZTaPtPlyu/B53HxmAQn0HKRZKLT3J71Kg== From: Bastien Curutchet Date: Thu, 18 Sep 2025 10:33:52 +0200 Subject: [PATCH net-next v3 3/3] net: dsa: microchip: Set SPI as bus interface during reset for KSZ8463 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250918-ksz-strap-pins-v3-3-16662e881728@bootlin.com> References: <20250918-ksz-strap-pins-v3-0-16662e881728@bootlin.com> In-Reply-To: <20250918-ksz-strap-pins-v3-0-16662e881728@bootlin.com> To: Woojung Huh , UNGLinuxDriver@microchip.com, Andrew Lunn , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut Cc: Thomas Petazzoni , =?utf-8?q?Miqu=C3=A8l_Raynal?= , Pascal Eberhard , Woojung Huh , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, "Bastien Curutchet (Schneider Electric)" X-Mailer: b4 0.14.2 X-Last-TLS-Session-Version: TLSv1.3 At reset, the KSZ8463 uses a strap-based configuration to set SPI as bus interface. SPI is the only bus supported by the driver. If the required pull-ups/pull-downs are missing (by mistake or by design to save power) the pins may float and the configuration can go wrong preventing any communication with the switch. Introduce a ksz8463_configure_straps_spi() function called during the device reset. It relies on the 'straps-rxd-gpios' OF property and the 'reset' pinmux configuration to enforce SPI as bus interface. Reviewed-by: Andrew Lunn Signed-off-by: Bastien Curutchet (Schneider Electric) --- drivers/net/dsa/microchip/ksz_common.c | 45 ++++++++++++++++++++++++++++++= ++++ 1 file changed, 45 insertions(+) diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/micro= chip/ksz_common.c index 7292bfe2f7cac3a0d88bb51339cc287f56ca1d1f..3bfa894d62eecc08dc45b25225e= 1122fe30b8f99 100644 --- a/drivers/net/dsa/microchip/ksz_common.c +++ b/drivers/net/dsa/microchip/ksz_common.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -5338,6 +5339,38 @@ static int ksz_parse_drive_strength(struct ksz_devic= e *dev) return 0; } =20 +static int ksz8463_configure_straps_spi(struct ksz_device *dev) +{ + struct pinctrl *pinctrl; + struct gpio_desc *rxd0; + struct gpio_desc *rxd1; + + rxd0 =3D devm_gpiod_get_index_optional(dev->dev, "straps-rxd", 0, GPIOD_O= UT_LOW); + if (IS_ERR(rxd0)) + return PTR_ERR(rxd0); + + rxd1 =3D devm_gpiod_get_index_optional(dev->dev, "straps-rxd", 1, GPIOD_O= UT_HIGH); + if (IS_ERR(rxd1)) + return PTR_ERR(rxd1); + + if (!rxd0 && !rxd1) + return 0; + + if ((rxd0 && !rxd1) || (rxd1 && !rxd0)) + return -EINVAL; + + pinctrl =3D devm_pinctrl_get_select(dev->dev, "reset"); + if (IS_ERR(pinctrl)) + return PTR_ERR(pinctrl); + + return 0; +} + +static int ksz8463_release_straps_spi(struct ksz_device *dev) +{ + return pinctrl_select_default_state(dev->dev); +} + int ksz_switch_register(struct ksz_device *dev) { const struct ksz_chip_data *info; @@ -5353,10 +5386,22 @@ int ksz_switch_register(struct ksz_device *dev) return PTR_ERR(dev->reset_gpio); =20 if (dev->reset_gpio) { + if (of_device_is_compatible(dev->dev->of_node, "microchip,ksz8463")) { + ret =3D ksz8463_configure_straps_spi(dev); + if (ret) + return ret; + } + gpiod_set_value_cansleep(dev->reset_gpio, 1); usleep_range(10000, 12000); gpiod_set_value_cansleep(dev->reset_gpio, 0); msleep(100); + + if (of_device_is_compatible(dev->dev->of_node, "microchip,ksz8463")) { + ret =3D ksz8463_release_straps_spi(dev); + if (ret) + return ret; + } } =20 mutex_init(&dev->dev_mutex); --=20 2.51.0