From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jisheng Zhang Subject: [PATCH v2 0/3] serial: 8250_dw: add fractional divisor support Date: Wed, 4 Jul 2018 16:59:08 +0800 Message-ID: <20180704165908.4bb8b090@xhacker.debian> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Andy Shevchenko , Greg Kroah-Hartman , Jiri Slaby Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org List-Id: linux-serial@vger.kernel.org For Synopsys DesignWare 8250 uart which version >= 4.00a, there's a valid divisor latch fraction register. The fractional divisor width is 4bits ~ 6bits. patch1 lets serial8250_get_divisor() get uart_port * as param patch2 introduces necessary hooks to 8250 core. patch3 implements the fractional divisor support for Synopsys DW 8250. 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: let serial8250_get_divisor() get uart_port * as param serial: 8250: introduce get_divisor() and set_divisor() hook serial: 8250_dw: add fractional divisor support drivers/tty/serial/8250/8250_core.c | 4 +++ drivers/tty/serial/8250/8250_dw.c | 53 +++++++++++++++++++++++++++++ drivers/tty/serial/8250/8250_port.c | 33 ++++++++++++++---- include/linux/serial_core.h | 7 ++++ 4 files changed, 90 insertions(+), 7 deletions(-) -- 2.18.0