[PATCH v2 1/3] serial: 8250_early: Add earlycon support for AMD Carrizo / Stoneyridge
From: Daniel Kurtz <hidden>
Date: 2018-03-14 21:44:36
Also in:
lkml
Subsystem:
8250/16?50 (and clone uarts) serial driver, the rest, tty layer and serial drivers · Maintainers:
Greg Kroah-Hartman, Linus Torvalds, Jiri Slaby
AMD Carrizo / Stoneyridge use a DesignWare 8250 UART that uses a 48 MHz input clock. Allow these platforms to set up this clock by specifying a kernel command line like: earlycon=amdcz,mmio32,0xfedc6000,115200 Signed-off-by: Daniel Kurtz <redacted> Suggested-by: Andy Shevchenko <redacted> Reviewed-by: Andy Shevchenko <redacted> --- drivers/tty/serial/8250/8250_early.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index ae6a256524d8..c6bf971a6038 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c@@ -195,3 +195,18 @@ static int __init early_au_setup(struct earlycon_device *dev, const char *opt) OF_EARLYCON_DECLARE(palmchip, "ralink,rt2880-uart", early_au_setup); #endif + +#ifdef CONFIG_SERIAL_8250_DW +static int __init early_amdcz_setup(struct earlycon_device *dev, + const char *opt) +{ + struct uart_port *port = &dev->port; + + port->uartclk = 48000000; + + return early_serial8250_setup(dev, opt); +} + +EARLYCON_DECLARE(amdcz, early_amdcz_setup); + +#endif
--
2.16.2.804.g6dcf76e118-goog