The miniuart uses the core clock as the clock source. This clock is fixed by the
firmware to 250Mhz if enable_uart=1 is set in the config.txt file.
However a user could still choose to overclock the core frequency,
which would result in wrong baudrates computed by barebox.
Retrieve the core clock frequency from the firmware to allow all potential
firmware configurations to work with barebox.
Signed-off-by: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
---
arch/arm/boards/raspberry-pi/rpi-common.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/arm/boards/raspberry-pi/rpi-common.c b/arch/arm/boards/raspberry-pi/rpi-common.c
index 887f096f7..f22239c7c 100644
--- a/arch/arm/boards/raspberry-pi/rpi-common.c
+++ b/arch/arm/boards/raspberry-pi/rpi-common.c
@@ -310,6 +310,13 @@ static int rpi_console_clock_init(void)
clkdev_add_physbase(clk, 0x20201000, NULL);
clkdev_add_physbase(clk, 0x3f201000, NULL);
+ clk = rpi_register_firmware_clock(BCM2835_MBOX_CLOCK_ID_CORE,
+ "uart1-8250");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ clkdev_add_physbase(clk, 0x3f215040, NULL);
+
clk = clk_fixed("bcm2835-cs", 1 * 1000 * 1000);
clk_register_clkdev(clk, NULL, "bcm2835-cs");
--
2.19.1
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
