From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) (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 700E5423A76 for ; Wed, 29 Apr 2026 19:14:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.43 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777490065; cv=none; b=EFwCi+l6pejhlADKNZkF2lQez9LYLZxT6FP3MeOraCNJvYPbi3Os5Diw/Et+bOvgrWYtEyJx6nim/l2Lgpg9mLZy8aNNOtEOyQHt3gMRiS6B1jxxeFteKSnRdrcH5/jwOSXTvGEGdBa8MHPOEHiy8ZRDA+MWXGMIHmWXrzEdzIg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777490065; c=relaxed/simple; bh=M2o/Qr31tdSVgMGK7MGptHsdQ8CYwaC7nU5G71DmAdM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Gyw/12LO46GVZPDusHWpt2C62m6JXkGjdFIgpiOwfi9zVEau5iuK0/Q0zc7YVKpu9Uqqda7kKW5y35m5xHKQ1CGTNz8xoZgirMnt0J5ZVe18FcRhGXnZy6LW0KLIfrIl8Xk4sGC9zAUKfCfVMMmMSAtlA+6uEhistQdgLKU7MXw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=HTufx7q3; arc=none smtp.client-ip=209.85.128.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="HTufx7q3" Received: by mail-wm1-f43.google.com with SMTP id 5b1f17b1804b1-483487335c2so1181005e9.2 for ; Wed, 29 Apr 2026 12:14:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1777490062; x=1778094862; darn=lists.linux.dev; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=8a6WmnzhZriHz9vEWPuhbpYJDMw8zDZc78JguLRxNCc=; b=HTufx7q3C0w0iIW4F3cqJz+CCRiniUVkkvxnuTjJgsAf+Ks2AWIwFdwZFUX1QXC62W 2CXr2KLtdcOaXs93q5ZDCMdzPOpmG00ycH8qPxdTuhFkfO7jjKcoqIwQyejUw+8MqISO XfzNxP5rV5UaTo8V3sxXJ5QUHFTzPnSOXsqDQekLu9ZWF3R5CHZAPrCSlJQIDRISf3O/ ULj6fP3Dq18uiDAfMf/9Y3cTvAnIeNlbe2oLTtf+T44n0Um06xYE1T9TJMrQBKbpmY+a hcMT27tpHlWSkzOuAfYd2sX8ArPJEB71/aWswn1pO3eXoBpihV4suunNIMGR4EbQ8Vcj F1cA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777490062; x=1778094862; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=8a6WmnzhZriHz9vEWPuhbpYJDMw8zDZc78JguLRxNCc=; b=S50L+KHzxDdWM82EFBjCTBSzWxDpeSGDnotepDckppvsS5FYPd7abrEl2Pyi+sEZOt YUtNE1x+KGI4MtjJ7m0QD4UzJi/0ggL8Nda1ygyvUMXBSAGNH7JGaj3vO93Fg78+cWd5 KJDcXOQBRt6mjUzg9uPIBjoa5I+08xhY+hO23otT803vhW168bv2zwHZzQONaiSSFLaY 5zvak5bIZ9w4aUIqps6OFb8j0skSSPk4pL3uHsTesVJ7Q+AIuPrgSOiwYTvs8HMdBtIH +ThzvXD4U63BFIXdDtidkSwz0duwayYGAuOZQhKHQSXNI9cjILZ8cmvWZydPdpMvr9OS 0N0Q== X-Forwarded-Encrypted: i=1; AFNElJ8C9CpvdZTh6VP2Y56hvett4bkYDW4FXTAQhP+CZ81Xp2XdvTcUP8ZaU3iOE7GLGyJhAK4=@lists.linux.dev X-Gm-Message-State: AOJu0YxwYBnl9n77hBB1QFPGKizepnAbHWvqSPUo2tzWJR5i40t4txFi JsU5Z+QOlkncpBXNzWIHyoYSiyJ4nXZlNTExoPil10I+y8Z5Mg9sPY6L X-Gm-Gg: AeBDiev9Lu7sg+vEoQd5gq5jdFrzRspFAaEf2BhksxZLZ7N/Nd1cCf0L0VXHmT+wWX1 3yoBzX6i+LCYr2E7jUbueeg15SZZmgg5ewL8/WJvT/q818AY7PfEKOLHIZYZK9JEcGiiYb3M/Zy RdrMDBL9vr0Jfuu37b95/nKcDjJh2keL8J2QOjEk8ZscUGSXv+3cT7JvBcpSHGR5aDnT1LBRVCo LJxUYqRhUdgNOOrazaxWKIyWut71oBVnTlCKIaEMFwunklZaWFthkSkpmVmCo6v85ambHowl0Bx qgkuVGSJCZW3yAhtqmTxgDF7RhvisEvFYR3ua5nklH3CHnp6INEoZ97ycIKgo59ooqBI1WqdvoZ n7D/9Bn3+IAlklMqCfZ6pafVDJB45ZeWtJYNr3DFVe2niBtZgPVUiw3xGjJenBQASGBhjb1VqzV PW0U1cE0dEP6oBpFgQE2q6NnoF/Hr2INp6TxMPWgVahk4lwQsK0ry3mg== X-Received: by 2002:a05:600c:3d90:b0:488:b239:77ec with SMTP id 5b1f17b1804b1-48a77b1781cmr145135425e9.17.1777490061506; Wed, 29 Apr 2026 12:14:21 -0700 (PDT) Received: from [192.168.0.2] ([197.250.51.50]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a7c316d7esm23315005e9.24.2026.04.29.12.14.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Apr 2026 12:14:20 -0700 (PDT) From: =?utf-8?q?Stefan_D=C3=B6singer?= Date: Wed, 29 Apr 2026 22:13:14 +0300 Subject: [PATCH v7 3/6] ARM: zte: Add support for zx29 low level debug Precedence: bulk X-Mailing-List: soc@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260429-send-v7-3-b432e00d2db8@gmail.com> References: <20260429-send-v7-0-b432e00d2db8@gmail.com> In-Reply-To: <20260429-send-v7-0-b432e00d2db8@gmail.com> To: Jonathan Corbet , Shuah Khan , Russell King , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Arnd Bergmann , Krzysztof Kozlowski , Alexandre Belloni , Linus Walleij , Drew Fustini , Greg Kroah-Hartman , Jiri Slaby Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, soc@lists.linux.dev, linux-serial@vger.kernel.org, =?utf-8?q?Stefan_D=C3=B6singer?= X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2630; i=stefandoesinger@gmail.com; h=from:subject:message-id; bh=M2o/Qr31tdSVgMGK7MGptHsdQ8CYwaC7nU5G71DmAdM=; b=owEBiQJ2/ZANAwAIAT0TvMhUTxoiAcsmYgBp8lh1uHld2kPX/8v2HJbRvy3ZwFQDa0OSTcuv+ 3Kf5aBkmCiJAk8EAAEIADkWIQRDFvS2qgVbJ5UyXWw9E7zIVE8aIgUCafJYdRsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQPRO8yFRPGiLcqA/6ApdrD8oX5RPE4JAHnJAWFBos5HFL/o2 XpNBXS+K9DRL+91EY4to310L+6z8TQUfVqrk6vT7uP51Htp4rLo/uARsSbhPjQy1cNh3ao1SJDE QSKaiv7L6V28sOG3uZuFOr8tv0vpjoIeYnquTU0Gatryy6thQB8C/MkegTMkAnAC6cxYcHt8OD/ b5r0sKjrMOJW5th8V6XCxmGEM284cWRjPuVCrhHf7+hBLRzu6eyMJITtCVq/PwWc6ORnu01LuEP tFBEjZcpB2AbeDG+Jadntjmrnnlw8UYCHth1SgL2z6Dp+HIqj4xUPu+cLoZiY/QpDHqW5bNyipa IrwZqC5FWMt+sSEHGAeTOaLIlgvbGgFrVX00vAk0llThQglR2tPjYi7LxhoF9w2OOc7DhaGD2uB vVM2bxL0GQxUB+O1ksEb4lW/cuySwq9iTj1xmwTncmyq/YtwpXrLybTkrMx6/Qg4ThWwsZqNnn6 irosXvwUcEXciS1mNGEz8hhwrVmFo4y8q/vyn+TV2GMeLIH+lqeg+v2aC1JlY6mgqvR3y9LGLxB huWQ2AZwCam0n0gUIZj7xS+yXFhQTxgjPGbMsjhGqVh5leaw4Rvft7M/rnjjBbQOy3ALyM8WkJy 8A116eIV8pRrCb6eTl0JrllUjOb02B99OzBB0OidNpqj3+C9ANvw= X-Developer-Key: i=stefandoesinger@gmail.com; a=openpgp; fpr=4F9C2C8728019633893EBBB98CB81F9A72BBA155 This is based on the removed zx29 code. A separate (more complicated) patch will re-add the register map to the pl011 serial driver. Reviewed-by: Linus Walleij Signed-off-by: Stefan Dösinger --- I am unsure about the virtual address. It doesn't seem to matter, as long as it is a valid address. This address is based on the old removed code. Is there a rule-of-thumb physical to virtual mapping I can use to give a sensible default value? --- arch/arm/Kconfig.debug | 12 ++++++++++++ arch/arm/include/debug/pl01x.S | 7 +++++++ 2 files changed, 19 insertions(+) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 366f162e147d..98d8a5a60048 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -1331,6 +1331,16 @@ choice This option selects UART0 on VIA/Wondermedia System-on-a-chip devices, including VT8500, WM8505, WM8650 and WM8850. + config DEBUG_ZTE_ZX + bool "Kernel low-level debugging via zx29 UART" + select DEBUG_UART_PL01X + depends on ARCH_ZTE + help + Say Y here if you are enabling ZTE zx297520v3 SOC and need + debug UART support. This UART is a PL011 with different + register addresses. The UART for boot messages on zx29 boards + is usually UART1 and is operating at 921600 8N1. + config DEBUG_ZYNQ_UART0 bool "Kernel low-level debugging on Xilinx Zynq using UART0" depends on ARCH_ZYNQ @@ -1545,6 +1555,7 @@ config DEBUG_UART_8250 config DEBUG_UART_PHYS hex "Physical base address of debug UART" + default 0x01408000 if DEBUG_ZTE_ZX default 0x01c28000 if DEBUG_SUNXI_UART0 default 0x01c28400 if DEBUG_SUNXI_UART1 default 0x01d0c000 if DEBUG_DAVINCI_DA8XX_UART1 @@ -1701,6 +1712,7 @@ config DEBUG_UART_VIRT default 0xf31004c0 if DEBUG_MESON_UARTAO default 0xf4090000 if DEBUG_LPC32XX default 0xf4200000 if DEBUG_GEMINI + default 0xf4708000 if DEBUG_ZTE_ZX default 0xf6200000 if DEBUG_PXA_UART1 default 0xf7000000 if DEBUG_SUN9I_UART0 default 0xf7000000 if DEBUG_S3C64XX_UART && DEBUG_S3C_UART0 diff --git a/arch/arm/include/debug/pl01x.S b/arch/arm/include/debug/pl01x.S index c7e02d0628bf..0c7bfa4c10db 100644 --- a/arch/arm/include/debug/pl01x.S +++ b/arch/arm/include/debug/pl01x.S @@ -8,6 +8,13 @@ */ #include +#ifdef CONFIG_DEBUG_ZTE_ZX +#undef UART01x_DR +#undef UART01x_FR +#define UART01x_DR 0x04 +#define UART01x_FR 0x14 +#endif + #ifdef CONFIG_DEBUG_UART_PHYS .macro addruart, rp, rv, tmp ldr \rp, =CONFIG_DEBUG_UART_PHYS -- 2.53.0