From nobody Wed Jun 17 05:16:05 2026 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) (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 EDBDC376496; Thu, 23 Apr 2026 06:23:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.61.82.184 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776925441; cv=none; b=ndkbFsRiPo+8JUUZIJhAbu4ZV8ptjDnvvTForkvRRmgO9FfqeFMUX70+HXymJPqPx9Y8Z0HnYcBJL2UA5QIsggw3K3w9v1vS2yT+vEXAEb3hZOp+lvDdRsn2TyEv3tG1wu0IigOZroZIf3kGjMtnxMb0N64vj2MRYFoi+dzgDuM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776925441; c=relaxed/simple; bh=rfcgibu0c4SNaJIOPHTylvWuJbZHlSROZbCEeQYTDQI=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Om3AunXks/BY7KKw20zloirA0jnubfQZHoVMbLGyA8JxUwo7B/n2qHJ3lQ1r5lEwXl1vtN4fCQi8B+be52d1x8y4CLt3qyQbfnVEyFCBWWEqDYnNbCjNdthyK7qOn5byx4KHkhfKMRFm/kZwY9kBjRpmLeF/MSISYozR/RPFh7c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=JVJNIgra; arc=none smtp.client-ip=210.61.82.184 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="JVJNIgra" X-UUID: fd416fde3edc11f19a16598d5ca7f8ec-20260423 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=kJAGLINp/Pud7AOgEdry/ygDJXpxw4I0iRZZy5NIKXY=; b=JVJNIgraYtQvraC4r6eCDrv9Byqv/4MAnHDM2lTxTD5diH66CNOqRO+SpEGP6eMcQpTizg+UpyBebadpF3MUgGmKbstgiiWE6RbYkoHyjVXJYdEULxOw2696pavtulaPLp7e7zSlA2baXiLacetdHM13RdlTE2+jED7fGomPZEw=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.12,REQID:41437f65-f73e-44f7-a8fc-6485720d9d02,IP:0,U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:-25 X-CID-META: VersionHash:e7bac3a,CLOUDID:9363c88f-6df4-4a3d-a7a4-fbdc42d669ce,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:81|82|102|836|865|888|898,TC:-5,Cont ent:0|15|50,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:-1,COL:0 ,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: fd416fde3edc11f19a16598d5ca7f8ec-20260423 Received: from mtkmbs14n2.mediatek.inc [(172.21.101.76)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1131951406; Thu, 23 Apr 2026 14:23:48 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs13n2.mediatek.inc (172.21.101.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Thu, 23 Apr 2026 14:23:47 +0800 Received: from mediatek.com (10.233.130.16) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.2562.29 via Frontend Transport; Thu, 23 Apr 2026 14:23:47 +0800 Received: by mediatek.com (Postfix, from userid 10007317) id 7FD3B200C6; Thu, 23 Apr 2026 14:23:47 +0800 (CST) From: Zhiyong Tao To: Greg Kroah-Hartman , Jiri Slaby , Matthias Brugger , AngeloGioacchino Del Regno CC: , , , , , , , , Yenchia Chen Subject: [PATCH] MEDIATEK: serial: 8250_mtk: Add ACPI support Date: Thu, 23 Apr 2026 14:22:45 +0800 Message-ID: <20260423062345.2473300-2-zhiyong.tao@mediatek.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260423062345.2473300-1-zhiyong.tao@mediatek.com> References: <20260423062345.2473300-1-zhiyong.tao@mediatek.com> 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 X-MTK: N Content-Type: text/plain; charset="utf-8" Add ACPI support to 8250_mtk driver. This makes it possible to use UART on ARM-based desktops with EDK2 UEFI firmware. Signed-off-by: Yenchia Chen Signed-off-by: Zhiyong Tao --- drivers/tty/serial/8250/8250_mtk.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8= 250_mtk.c index 5875a7b9b4b10..e6a56cf54ae0c 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -19,6 +19,7 @@ #include #include #include +#include =20 #include "8250.h" =20 @@ -521,6 +522,7 @@ static int mtk8250_probe(struct platform_device *pdev) struct mtk8250_data *data; struct resource *regs; int irq, err; + struct fwnode_handle *fwnode =3D dev_fwnode(&pdev->dev); =20 irq =3D platform_get_irq(pdev, 0); if (irq < 0) @@ -543,12 +545,13 @@ static int mtk8250_probe(struct platform_device *pdev) =20 data->clk_count =3D 0; =20 - if (pdev->dev.of_node) { + if (is_of_node(fwnode)) { err =3D mtk8250_probe_of(pdev, &uart.port, data); if (err) return err; - } else + } else if (!fwnode) { return -ENODEV; + } =20 spin_lock_init(&uart.port.lock); uart.port.mapbase =3D regs->start; @@ -564,14 +567,18 @@ static int mtk8250_probe(struct platform_device *pdev) uart.port.startup =3D mtk8250_startup; uart.port.set_termios =3D mtk8250_set_termios; uart.port.uartclk =3D clk_get_rate(data->uart_clk); + if (!uart.port.uartclk) + uart.port.uartclk =3D 26 * HZ_PER_MHZ; #ifdef CONFIG_SERIAL_8250_DMA if (data->dma) uart.dma =3D data->dma; #endif =20 - /* Disable Rate Fix function */ - writel(0x0, uart.port.membase + + if (is_of_node(fwnode)) { + /* Disable Rate Fix function */ + writel(0x0, uart.port.membase + (MTK_UART_RATE_FIX << uart.port.regshift)); + } =20 platform_set_drvdata(pdev, data); =20 @@ -649,11 +656,19 @@ static const struct of_device_id mtk8250_of_match[] = =3D { }; MODULE_DEVICE_TABLE(of, mtk8250_of_match); =20 +static const struct acpi_device_id mtk8250_acpi_match[] =3D { + { "MTKI0511" }, + { "NVDA0240" }, + {} +}; +MODULE_DEVICE_TABLE(acpi, mtk8250_acpi_match); + static struct platform_driver mtk8250_platform_driver =3D { .driver =3D { .name =3D "mt6577-uart", .pm =3D &mtk8250_pm_ops, .of_match_table =3D mtk8250_of_match, + .acpi_match_table =3D mtk8250_acpi_match, }, .probe =3D mtk8250_probe, .remove =3D mtk8250_remove, --=20 2.45.2