[RFC PATCH 09/10] drivers: PL011: allow to supply fixed option string
From: andre.przywara@arm.com (Andre Przywara)
Date: 2014-09-19 12:21:22
Also in:
linux-serial
Subsystem:
arm primecell uart pl010 and pl011 drivers, the rest, tty layer and serial drivers · Maintainers:
Russell King, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
The SBSA UART has a fixed baud rate and flow control setting, which cannot be changed or queried by software. Add a vendor specific property to always return fixed values when trying to read the console options. Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- drivers/tty/serial/amba-pl011.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 70af210..12f1a5f 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c@@ -79,6 +79,7 @@ struct vendor_data { bool dma_threshold; bool cts_event_workaround; bool always_enabled; + char *fixed_options; unsigned int (*get_fifosize)(struct amba_device *dev); };
@@ -96,6 +97,7 @@ static struct vendor_data vendor_arm = { .dma_threshold = false, .cts_event_workaround = false, .always_enabled = false, + .fixed_options = NULL, .get_fifosize = get_fifosize_arm, };
@@ -112,6 +114,7 @@ static struct vendor_data vendor_st = { .dma_threshold = true, .cts_event_workaround = true, .always_enabled = false, + .fixed_options = NULL, .get_fifosize = get_fifosize_st, };
@@ -2062,6 +2065,9 @@ static int __init pl011_console_setup(struct console *co, char *options) uap->port.uartclk = clk_get_rate(uap->clk); + if (!options && uap->vendor->fixed_options) + options = uap->vendor->fixed_options; + if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); else
--
1.7.9.5