From patchwork Tue Nov 16 15:01:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emil Renner Berthing X-Patchwork-Id: 517616 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EC891C433EF for ; Tue, 16 Nov 2021 15:05:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D3D0061AF0 for ; Tue, 16 Nov 2021 15:05:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237898AbhKPPIq (ORCPT ); Tue, 16 Nov 2021 10:08:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47982 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237858AbhKPPHR (ORCPT ); Tue, 16 Nov 2021 10:07:17 -0500 Received: from mail-ed1-x52e.google.com (mail-ed1-x52e.google.com [IPv6:2a00:1450:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 98B9DC06122A; Tue, 16 Nov 2021 07:02:24 -0800 (PST) Received: by mail-ed1-x52e.google.com with SMTP id e3so52796349edu.4; Tue, 16 Nov 2021 07:02:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=pprlQQrC3e4SR43dlURXybUN17p6YfB+zpLDI5SbPMo=; b=Ihg2ksTlUfZMj2Xi4GUUAqtc7R5Kf8Oh833r/M1+6NwUDNPDVkV1IvkoyzvaoJkOGH 7htZt2TN4YvCdsRRa8dcj+9eKk7xFFjWu8eELhNsLqGAIWsw4XUcRfaxyoV3b50YIZHP ovXfZgvJlvgrENvNoLGBRBH4IfByp2ZKKyZcQJjWsTRRmDmGJreHltD6pAsKIc5ynfhn yYejvbFEQ3LLeC2b9jew0MOLPsnTqpvnJiumS1Fizq4jrJun8MKf4fDGSgiHVeK+Yy1q jScCO+SFRuLjY8dcw99PH5yAkjhCWlTQSLqwfdu3q3HT08nFkn13pi36jK1G2Ft0MPxd FHGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=pprlQQrC3e4SR43dlURXybUN17p6YfB+zpLDI5SbPMo=; b=fAQ/tAO7+02fteC/ICa8sUxNZ57ASFqhhysvCB4cb/s2vN0P5pPq6CwEPq7YBQfPPv biKCFKW9gDagE3wBV6PSxUjHLqaZmtL3QriXwwk70ryzlt9GDUNFNEYfdNbFYohiqRqq fvXqNe78Q/Du/OAIMCqpCiqPNmwBmBRuPaRAj6QluXR6YXJy+t0YZQqIe5nJMzBj5yYC 1xrm652/2w/t63lfi449rct0kqBXsHyYxeAzbwGVjiRimrEAw2hqwyvLmzoXF5RoJDTY Pfce6oGWMyyoYyb8ZMuK8HG/pDsilOX+8CKu29/KMLf+hehtqbT8aIgYH/lAH4/TO/hI X7IQ== X-Gm-Message-State: AOAM531jCNsJ8zbcYCpo9B95vHF7t3rFbNTu/6bwoJXabWj1x6z6UL7R ScIJO//pHK0AZxRXQ/ub2qs= X-Google-Smtp-Source: ABdhPJwRgX8E9uRvMmlHIDeM54xPkwChrHpz2rq7KpOqT3ij+uMWBF5Hl3T5cQbXnKSNpsSqfkll0w== X-Received: by 2002:a17:906:b51:: with SMTP id v17mr11014072ejg.262.1637074940749; Tue, 16 Nov 2021 07:02:20 -0800 (PST) Received: from stitch.. ([2a02:aa7:4600:b4ae:a375:e7a0:9eaf:8d7b]) by smtp.gmail.com with ESMTPSA id u16sm9414311edr.43.2021.11.16.07.02.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Nov 2021 07:02:20 -0800 (PST) Sender: Emil Renner Berthing From: Emil Renner Berthing To: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, linux-serial@vger.kernel.org Cc: Emil Renner Berthing , Palmer Dabbelt , Paul Walmsley , Rob Herring , Michael Turquette , Stephen Boyd , Thomas Gleixner , Marc Zyngier , Philipp Zabel , Linus Walleij , Greg Kroah-Hartman , Daniel Lezcano , Andy Shevchenko , Jiri Slaby , Maximilian Luz , Sagar Kadam , Drew Fustini , Geert Uytterhoeven , Michael Zhu , Fu Wei , Anup Patel , Atish Patra , Matteo Croce , Arnd Bergmann , linux-kernel@vger.kernel.org, Andy Shevchenko Subject: [PATCH v4 14/16] serial: 8250_dw: Add StarFive JH7100 quirk Date: Tue, 16 Nov 2021 16:01:17 +0100 Message-Id: <20211116150119.2171-15-kernel@esmil.dk> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211116150119.2171-1-kernel@esmil.dk> References: <20211116150119.2171-1-kernel@esmil.dk> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org On the StarFive JH7100 RISC-V SoC the UART core clocks can't be set to exactly 16 * 115200Hz and many other common bitrates. Trying this will only result in a higher input clock, but low enough that the UART's internal divisor can't come close enough to the baud rate target. So rather than try to set the input clock it's better to skip the clk_set_rate call and rely solely on the UART's internal divisor. Signed-off-by: Emil Renner Berthing Reviewed-by: Andy Shevchenko Reviewed-by: Geert Uytterhoeven --- drivers/tty/serial/8250/8250_dw.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 53f57c3b9f42..1769808031c5 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -414,6 +414,8 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data) if (of_device_is_compatible(np, "marvell,armada-38x-uart")) p->serial_out = dw8250_serial_out38x; + if (of_device_is_compatible(np, "starfive,jh7100-uart")) + p->set_termios = dw8250_do_set_termios; } else if (acpi_dev_present("APMC0D08", NULL, -1)) { p->iotype = UPIO_MEM32; @@ -696,6 +698,7 @@ static const struct of_device_id dw8250_of_match[] = { { .compatible = "cavium,octeon-3860-uart" }, { .compatible = "marvell,armada-38x-uart" }, { .compatible = "renesas,rzn1-uart" }, + { .compatible = "starfive,jh7100-uart" }, { /* Sentinel */ } }; MODULE_DEVICE_TABLE(of, dw8250_of_match);