This adds the hooks for an optional reset controller in the 8250 device tree node.
Signed-off-by: Joel Stanley <[email protected]> --- Documentation/devicetree/bindings/serial/8250.txt | 1 + drivers/tty/serial/8250/8250_of.c | 16 ++++++++++++++++ 2 files changed, 17 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..f34dd23376f4 100644 --- a/drivers/tty/serial/8250/8250_of.c +++ b/drivers/tty/serial/8250/8250_of.c @@ -19,11 +19,13 @@ #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/clk.h> +#include <linux/reset.h> #include "8250.h" struct of_serial_info { struct clk *clk; + struct reset_control *rst; int type; int line; }; @@ -132,6 +134,18 @@ static int of_platform_serial_setup(struct platform_device *ofdev, } } + info->rst = devm_reset_control_get_optional(&ofdev->dev, NULL); + if (IS_ERR(info->rst)) { + ret = PTR_ERR(info->rst); + if (ret == -EPROBE_DEFER) + goto out; + info->rst = NULL; + } else { + 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 @@ -231,6 +245,8 @@ static int of_platform_serial_remove(struct platform_device *ofdev) if (info->clk) clk_disable_unprepare(info->clk); + if (info->rst) + reset_control_assert(info->rst); kfree(info); return 0; } -- 2.11.0
