From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joel Stanley Subject: [PATCH v3] serial: 8250_of: Add reset support Date: Mon, 29 May 2017 19:27:52 +0930 Message-ID: <20170529095753.1210-1-joel@jms.id.au> Return-path: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Greg Kroah-Hartman , Rob Herring , Mark Rutland , Philipp Zabel Cc: linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-serial@vger.kernel.org This adds the hooks for an optional reset controller in the 8250 device tree node. Signed-off-by: Joel Stanley Reviewed-by: Philipp Zabel --- v3: - deassert reset after disabling clock in _remove to to match _setup order v2: Address Philipp's comments. Thanks for the review! - use _shared variant - remove unnecessary error handling Documentation/devicetree/bindings/serial/8250.txt | 1 + drivers/tty/serial/8250/8250_of.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/Documentation/devicetree/bindings/serial/8250.txt b/Documentation/devicetree/bindings/serial/8250.txt index 10276a46ecef..63e32393f82b 100644 --- a/Documentation/devicetree/bindings/serial/8250.txt +++ b/Documentation/devicetree/bindings/serial/8250.txt @@ -45,6 +45,7 @@ Optional properties: property. - tx-threshold: Specify the TX FIFO low water indication for parts with programmable TX FIFO thresholds. +- resets : phandle + reset specifier pairs Note: * fsl,ns16550: diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c index 1cbadafc6889..0cf95fddccfc 100644 --- a/drivers/tty/serial/8250/8250_of.c +++ b/drivers/tty/serial/8250/8250_of.c @@ -19,11 +19,13 @@ #include #include #include +#include #include "8250.h" struct of_serial_info { struct clk *clk; + struct reset_control *rst; int type; int line; }; @@ -132,6 +134,13 @@ static int of_platform_serial_setup(struct platform_device *ofdev, } } + info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL); + if (IS_ERR(info->rst)) + goto out; + ret = reset_control_deassert(info->rst); + if (ret) + goto out; + port->type = type; port->uartclk = clk; port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP @@ -229,6 +238,7 @@ static int of_platform_serial_remove(struct platform_device *ofdev) serial8250_unregister_port(info->line); + reset_control_assert(info->rst); if (info->clk) clk_disable_unprepare(info->clk); kfree(info); -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html