From nobody Wed Jan 7 23:14:39 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 935A13164D4; Mon, 5 Jan 2026 02:41:16 +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=1767580879; cv=none; b=eLtI+NwVnRTAlaJ1WzKMuepxKvmW0fPS7klI/KcN6P1n3H70lWi5Oj5ClvBA4MejuMRxicEX6rU+i28TlmKnBJMkcWOcaAO+lfHzPt6/RT6K4o2qDogrGEb3Vl/SXco7HmSwR2617DEPxVfcFwI7ZTLANTMKawGlYtMPHQEi4Z4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767580879; c=relaxed/simple; bh=zlBvy830AdQLVe6b8HS5Bjfb7jv7Xh6htQ9+DoQeP5I=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=agNxyC5vg1ISpaM7t6H8SlX+1hcpJ3w7l33i9ukQXlRxvJkz4pH7O5Gmyz1GTNcJpfGyV3xw8mziTtkCQgRdXzbDJt5KvOkTOvhm+k6p3QF6R0uF/dQRO3yX8Qn5ULcGQ/VxRTGP2CD6dkJZKWK5xa97dfGZsWDtt/uRMBUnqqA= 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=Cm0NCZ5/; 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="Cm0NCZ5/" X-UUID: fb68c614e9df11f0b33aeb1e7f16c2b6-20260105 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=V7IFbZVIyPVKWadnXb+iToLnqdSwPcwtFdqT4vEhn9U=; b=Cm0NCZ5/0ilpflUNGGR2WF66zLHr3A46xiCnnCnfAVh6Bs+3GG62x273OExg9jdY7jHmDHVCi+6vAkZPMAN1EhnOHiT5J6lFhD3Cthxfag9ErotfcPxscQH+g/mVlHhRP6AwB1D02ZiKUU4TF1MfqHDYZ2I6rdgconSgq6AKJSQ=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.9,REQID:ab9ef169-c4f6-4823-b664-cf60a7af6bce,IP:0,UR L:0,TC:0,Content:-25,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:-25 X-CID-META: VersionHash:5047765,CLOUDID:40a63829-e3a2-4f78-a442-8c73c4eb9e9d,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:81|82|102|836|888|898,TC:-5,Content: 0|15|50,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:nil,COL:0,OS I: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: fb68c614e9df11f0b33aeb1e7f16c2b6-20260105 Received: from mtkmbs13n1.mediatek.inc [(172.21.101.193)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1331170852; Mon, 05 Jan 2026 10:41:05 +0800 Received: from mtkmbs13n2.mediatek.inc (172.21.101.108) by MTKMBS09N1.mediatek.inc (172.21.101.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Mon, 5 Jan 2026 10:41:05 +0800 Received: from mediatek.com (10.233.130.16) by mtkmbs13n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.2562.29 via Frontend Transport; Mon, 5 Jan 2026 10:41:05 +0800 Received: by mediatek.com (Postfix, from userid 10007317) id 0A1A6200C5; Mon, 5 Jan 2026 10:41:05 +0800 (CST) From: Zhiyong Tao To: , , , , CC: , , , , , , , Yenchia Chen Subject: [PATCH] MEDIATEK: serial: 8250_mtk: Add ACPI support Date: Mon, 5 Jan 2026 10:39:55 +0800 Message-ID: <20260105024103.2027085-2-zhiyong.tao@mediatek.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260105024103.2027085-1-zhiyong.tao@mediatek.com> References: <20260105024103.2027085-1-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" From: "Zhiyong.Tao" 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 5875a7b9b4b1..e6a56cf54ae0 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