From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ultrarisc.com (unknown [218.76.62.146]) by smtp.subspace.kernel.org (Postfix) with ESMTP id EF4EE3BC693; Wed, 29 Apr 2026 09:13:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=218.76.62.146 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777454019; cv=none; b=CyTbtkvebiULxUr8u1nygxwT0576jo50l9ecrg/J40sqEJETs+d27ChK+ioQ07+hNBRHwSNH0hXZUsxBqscCsPj7rN2zFSt+BKyQ27R4kbwrZvAecWdE8IZENVXwtsztbhBBwsFSjamLF4YpTWDPBZgkph5Ee2A48nJRg7y4GRk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777454019; c=relaxed/simple; bh=+dtQ3f+XBoxv3HZDucz50ukJ2U/SQ+5U7lcx9cpy2/w=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=tpHWHw5hg+6pNZBUOoDdjhOWpeNZywWwu+XlYvA8mtLiN7WIP3d/91XNlWY13RVl1++OcvlyOjdFajAGaaH/sbk13t9S+pOcIOHdpXsPzu7ACvWrFsHWz8noKc9LTg/kjPqPvjBnAseHX7wqPym3U9Inzj/9jUtouIURk3NEt0g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ultrarisc.com; spf=pass smtp.mailfrom=ultrarisc.com; dkim=pass (1024-bit key) header.d=ultrarisc.com header.i=@ultrarisc.com header.b=A+NwNV1k; arc=none smtp.client-ip=218.76.62.146 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ultrarisc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ultrarisc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ultrarisc.com header.i=@ultrarisc.com header.b="A+NwNV1k" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ultrarisc.com; s=dkim; h=Received:From:Date:Subject: MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id: References:In-Reply-To:To:Cc; bh=W6qFc8IOjX0c5M+yiuQoc29Iohko0me 7jng1y1x4BCM=; b=A+NwNV1k4NPQTKIfGOwBv8LBYrMyUE9hyuYdOfkG1Z2gRmn b53Q6VEYpzbLBIYFB0e1uOKU/FgN7x+z2uTS4wfeRX913O1sosINBLz4OyWL8kz5 DROBZQXKtfM2UpgI5M4yQmmLsDhOMmzdVoGVkS0QS7zH8IdWcNcMwLbtjF88= Received: from [127.0.0.1] (unknown [192.168.100.1]) by localhost.localdomain (Coremail) with SMTP id AQAAfwA3cULgy_FpFiUDAA--.1811S6; Wed, 29 Apr 2026 17:14:11 +0800 (CST) From: Jia Wang Date: Wed, 29 Apr 2026 17:13:28 +0800 Subject: [PATCH v7 4/4] serial: 8250_dw: Use a fixed CPR value for UltraRISC DP1000 UART Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260429-ultrarisc-serial-v7-4-e475cce9e274@ultrarisc.com> References: <20260429-ultrarisc-serial-v7-0-e475cce9e274@ultrarisc.com> In-Reply-To: <20260429-ultrarisc-serial-v7-0-e475cce9e274@ultrarisc.com> To: =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Andy Shevchenko , Greg Kroah-Hartman , Jiri Slaby , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, Jia Wang X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1777454005; l=1792; i=wangjia@ultrarisc.com; s=20260309; h=from:subject:message-id; bh=+dtQ3f+XBoxv3HZDucz50ukJ2U/SQ+5U7lcx9cpy2/w=; b=nmerw0ArdTWMMQFMZSuME4C0AJnXNs0ypTI1gfzcje9qI2TXhHpB7t9chdK9vLktGmCITfZg0 WR1yoMKYkBcCvGxo3WPqYm1vQFQGZCHi5fl5eBJFIMhcMl1iYh9g1EB X-Developer-Key: i=wangjia@ultrarisc.com; a=ed25519; pk=XvYkrelqJIIzobY7j+nIg8rsfv5kzaOzuc1UPhd087U= X-CM-TRANSID:AQAAfwA3cULgy_FpFiUDAA--.1811S6 X-Coremail-Antispam: 1UD129KBjvJXoW7tw1kXw4fWry5Gw18AryfXrb_yoW8Cr4fpF 47GrZ0vFySgF4Yg3WIy3WvvFZ7ua17Zry2k3srK347tFn8tFyUJrnakrWay3ZIgFySqw1a yF1Y9rW7Aa18Za7anT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnUUvcSsGvfC2KfnxnUUI43ZEXa7xR_UUUUUUUUU== X-CM-SenderInfo: pzdqwylld63zxwud2x1vfou0bp/1tbiAQAKEWnti78ACwBVs0 The UltraRISC DP1000 UART does not provide the standard CPR register used by 8250_dw to discover port capabilities. Provide a fixed CPR value for the DP1000-specific compatible so the driver can configure the port correctly. Signed-off-by: Jia Wang Reviewed-by: Andy Shevchenko --- drivers/tty/serial/8250/8250_dw.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 480f82d89856..55e40c10f46a 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -959,6 +959,15 @@ static const struct dw8250_platform_data dw8250_intc10ee = { .quirks = DW_UART_QUIRK_IER_KICK, }; +static const struct dw8250_platform_data dw8250_ultrarisc_dp1000_data = { + .usr_reg = DW_UART_USR, + .cpr_value = FIELD_PREP_CONST(DW_UART_CPR_ABP_DATA_WIDTH, 2) | + DW_UART_CPR_THRE_MODE | + DW_UART_CPR_DMA_EXTRA | + DW_UART_CPR_FIFO_MODE_FROM_SIZE(32), + .quirks = DW_UART_QUIRK_CPR_VALUE, +}; + static const struct of_device_id dw8250_of_match[] = { { .compatible = "snps,dw-apb-uart", .data = &dw8250_dw_apb }, { .compatible = "cavium,octeon-3860-uart", .data = &dw8250_octeon_3860_data }, @@ -966,6 +975,7 @@ static const struct of_device_id dw8250_of_match[] = { { .compatible = "renesas,rzn1-uart", .data = &dw8250_renesas_rzn1_data }, { .compatible = "sophgo,sg2044-uart", .data = &dw8250_skip_set_rate_data }, { .compatible = "starfive,jh7100-uart", .data = &dw8250_skip_set_rate_data }, + { .compatible = "ultrarisc,dp1000-uart", .data = &dw8250_ultrarisc_dp1000_data }, { /* Sentinel */ } }; MODULE_DEVICE_TABLE(of, dw8250_of_match); -- 2.34.1