[PATCH V7 1/6] tty: serial: meson: Move request the register region to probe
From: Yu Tu <hidden>
Date: 2022-02-25 07:40:02
Also in:
linux-amlogic, linux-arm-kernel, lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
This simplifies resetting the UART controller during probe and will make it easier to integrate the common clock code which will require the registers at probe time as well. Signed-off-by: Yu Tu <redacted> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> --- drivers/tty/serial/meson_uart.c | 32 ++++++++++++++------------------ 1 file changed, 14 insertions(+), 18 deletions(-)
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index 45e00d928253..6b80e41b4cc1 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c@@ -395,24 +395,11 @@ static int meson_uart_verify_port(struct uart_port *port, static void meson_uart_release_port(struct uart_port *port) { - devm_iounmap(port->dev, port->membase); - port->membase = NULL; - devm_release_mem_region(port->dev, port->mapbase, port->mapsize); + /* nothing to do */ } static int meson_uart_request_port(struct uart_port *port) { - if (!devm_request_mem_region(port->dev, port->mapbase, port->mapsize, - dev_name(port->dev))) { - dev_err(port->dev, "Memory region busy\n"); - return -EBUSY; - } - - port->membase = devm_ioremap(port->dev, port->mapbase, - port->mapsize); - if (!port->membase) - return -ENOMEM; - return 0; }
@@ -733,6 +720,18 @@ static int meson_uart_probe(struct platform_device *pdev) if (!port) return -ENOMEM; + if (!devm_request_mem_region(&pdev->dev, res_mem->start, + resource_size(res_mem), + dev_name(&pdev->dev))) { + dev_err(&pdev->dev, "Memory region busy\n"); + return -EBUSY; + } + + port->membase = devm_ioremap(&pdev->dev, res_mem->start, + resource_size(res_mem)); + if (IS_ERR(port->membase)) + return PTR_ERR(port->membase); + ret = meson_uart_probe_clocks(pdev, port); if (ret) return ret;
@@ -754,10 +753,7 @@ static int meson_uart_probe(struct platform_device *pdev) platform_set_drvdata(pdev, port); /* reset port before registering (and possibly registering console) */ - if (meson_uart_request_port(port) >= 0) { - meson_uart_reset(port); - meson_uart_release_port(port); - } + meson_uart_reset(port); ret = uart_add_one_port(&meson_uart_driver, port); if (ret)
--
2.33.1