From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pidgin.makrotopia.org (pidgin.makrotopia.org [185.142.180.65]) (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 3590D375F80; Tue, 7 Jul 2026 14:16:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.142.180.65 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783433780; cv=none; b=RViz+NHwLZ8Lb8x2N7tGLgNMHCOiALMb9fPGoZg41ZaM0indwjsOzCa7AjPdobasSK/dlqWDN8psvsbSXU+HdJ0ztbwg+NCsBtKMxXS+pj/mDyGJvrj7Y36XYhKFEdYMJFK3Jd1uKluCeFlpxAMImTKQleec/1rXhk4tmvwbvUE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783433780; c=relaxed/simple; bh=CtInqgYaYPPYAPb+Q1dD3K6AQRXwhR/EmugxqI8k/Ig=; h=Date:From:To:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=q6ORHw5MljlEUKOx1HgKCJF3gIKvG5iza3BwtQxWtf7SRAX3J68kY+RqYVeazJUp+gpNdJc2WzJhobWs78Fv70CQ1Jjy0oXW8lBDeyL6gt/ZP8VQbkeMiwPv1hZAbQu0ECkqBrE4W9PbfJKM9iLtZpcWu0Eg2xY/MUGAoGZEDPs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org; spf=pass smtp.mailfrom=makrotopia.org; arc=none smtp.client-ip=185.142.180.65 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=makrotopia.org Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.99) (envelope-from ) id 1wh6as-000000008AX-41Ds; Tue, 07 Jul 2026 14:16:15 +0000 Date: Tue, 7 Jul 2026 16:16:07 +0200 From: Daniel Golle To: Andrew Lunn , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH RFC net-next 2/3] net: dsa: mxl862xx: add SMDIO clause-22 register access Message-ID: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Add mxl862xx_smdio_read() and mxl862xx_smdio_write() for clause-22 SMDIO register access. MCUboot rescue mode only exposes clause-22 registers; the existing clause-45 MMD interface is unavailable during firmware transfer. The MDIO bus lock is held per-transaction (not across polls) so that SB PDI polling during flash erase does not starve other MDIO users. Signed-off-by: Daniel Golle --- drivers/net/dsa/mxl862xx/mxl862xx-host.c | 35 ++++++++++++++++++++++++ drivers/net/dsa/mxl862xx/mxl862xx-host.h | 2 ++ 2 files changed, 37 insertions(+) diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-host.c b/drivers/net/dsa/mxl862xx/mxl862xx-host.c index 4acd216f7cc0..6e582caea1fa 100644 --- a/drivers/net/dsa/mxl862xx/mxl862xx-host.c +++ b/drivers/net/dsa/mxl862xx/mxl862xx-host.c @@ -495,6 +495,41 @@ int mxl862xx_reset(struct mxl862xx_priv *priv) return ret; } +#define MXL862XX_SMDIO_ADDR_REG 0x1f +#define MXL862XX_SMDIO_PAGE_MASK 0xfff0 +#define MXL862XX_SMDIO_OFF_MASK 0x000f + +int mxl862xx_smdio_read(struct mxl862xx_priv *priv, u32 addr) +{ + struct mii_bus *bus = priv->mdiodev->bus; + int phy = priv->mdiodev->addr; + int ret; + + mutex_lock(&bus->mdio_lock); + ret = __mdiobus_write(bus, phy, MXL862XX_SMDIO_ADDR_REG, + addr & MXL862XX_SMDIO_PAGE_MASK); + if (ret >= 0) + ret = __mdiobus_read(bus, phy, addr & MXL862XX_SMDIO_OFF_MASK); + mutex_unlock(&bus->mdio_lock); + return ret; +} + +int mxl862xx_smdio_write(struct mxl862xx_priv *priv, u32 addr, u16 val) +{ + struct mii_bus *bus = priv->mdiodev->bus; + int phy = priv->mdiodev->addr; + int ret; + + mutex_lock(&bus->mdio_lock); + ret = __mdiobus_write(bus, phy, MXL862XX_SMDIO_ADDR_REG, + addr & MXL862XX_SMDIO_PAGE_MASK); + if (ret >= 0) + ret = __mdiobus_write(bus, phy, addr & MXL862XX_SMDIO_OFF_MASK, + val); + mutex_unlock(&bus->mdio_lock); + return ret; +} + void mxl862xx_host_init(struct mxl862xx_priv *priv) { INIT_WORK(&priv->crc_err_work, mxl862xx_crc_err_work_fn); diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-host.h b/drivers/net/dsa/mxl862xx/mxl862xx-host.h index 66d6ae198aff..4e054c6e4c0e 100644 --- a/drivers/net/dsa/mxl862xx/mxl862xx-host.h +++ b/drivers/net/dsa/mxl862xx/mxl862xx-host.h @@ -18,5 +18,7 @@ int mxl862xx_api_wrap(struct mxl862xx_priv *priv, u16 cmd, void *data, u16 size, mxl862xx_api_wrap(dev, cmd, &(data), sizeof((data)), true, true) int mxl862xx_reset(struct mxl862xx_priv *priv); +int mxl862xx_smdio_read(struct mxl862xx_priv *priv, u32 addr); +int mxl862xx_smdio_write(struct mxl862xx_priv *priv, u32 addr, u16 val); #endif /* __MXL862XX_HOST_H */ -- 2.55.0