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Thu, 12 Jul 2018 01:57:11 +0000 Date: Thu, 12 Jul 2018 09:55:04 +0800 From: Jisheng Zhang To: Andy Shevchenko , Greg Kroah-Hartman , Jiri Slaby Cc: linux-arm-kernel@lists.infradead.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 0/3] serial: 8250_dw: add fractional divisor support Message-ID: <20180712095504.4d9583ce@xhacker.debian> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Originating-IP: [124.74.246.114] X-ClientProxiedBy: MRXP264CA0025.FRAP264.PROD.OUTLOOK.COM (2603:10a6:500:14::13) To MWHPR03MB2639.namprd03.prod.outlook.com (2603:10b6:300:46::9) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ded1bfd4-1327-4676-64e7-08d5e79aca2b X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989117)(5600053)(711020)(4534165)(4627221)(201703031133081)(201702281549075)(8990107)(2017052603328)(7153060)(7193020);SRVR:MWHPR03MB2639; 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The fractional divisor width is 4bits ~ 6bits. patch1 introduces necessary hooks to 8250 core. patch2 exports serial8250_do_set_divisor() patch3 implements the fractional divisor support for Synopsys DW 8250. Since v5: - Add Andy's Reviewed-by tag to all patches. Since v4: - use tmp to save baud * 16 rather than calculate every time in dw8250_get_divisor() Since v3: - simplify the dw8250_get_divisor() implementation again. Since v2: - rebase to tty-next branch, since I need one patch from Andy which is in tty-next - drop the patch "serial: 8250: let serial8250_get_divisor() get uart_port * as param" since it's in tty-next now. - add a new patch to export serial8250_do_set_divisor(), and reuse it to complete dw8250_set_divisor(). - remove DW 8250 version check, since the DLF register always exists and if fractional divisor isn't supported, the register read as 0 - add comments to explain how dw8250_get_divisor() get quot and frac. - the frac calcuation is simplified with well implemented GENMASK - Add Andy's Reviewed-by tag to patch1. Since v1: - add an extra patch to let serial8250_get_divisor() get uart_port * as param - take Andy's suggestions to "integrates hooks in the same way like it's done for the rest of 8250 ones". Many thanks to Andy. Jisheng Zhang (3): serial: 8250: introduce get_divisor() and set_divisor() hook serial: 8250: export serial8250_do_set_divisor() serial: 8250_dw: add fractional divisor support drivers/tty/serial/8250/8250_core.c | 4 +++ drivers/tty/serial/8250/8250_dw.c | 45 +++++++++++++++++++++++++++++ drivers/tty/serial/8250/8250_port.c | 30 +++++++++++++++---- include/linux/serial_8250.h | 3 ++ include/linux/serial_core.h | 7 +++++ 5 files changed, 84 insertions(+), 5 deletions(-) -- 2.18.0