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| author | Rouven Czerwinski <r.czerwinski@pengutronix.de> | 2019-01-15 06:44:03 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2019-02-05 12:39:09 +0100 |
| commit | 9c3fe58fd962651bcab98b7d6f919a3e11e0dc3f (patch) | |
| tree | 84adf53ea0991e6d9148c59a8d7a143fc4456609 /arch | |
| parent | 86ec9aa7458ef752bdaed124e9905ef5d4ecf978 (diff) | |
| download | barebox-9c3fe58fd962651bcab98b7d6f919a3e11e0dc3f.tar.gz barebox-9c3fe58fd962651bcab98b7d6f919a3e11e0dc3f.tar.xz | |
ARM: rpi: retrieve miniuart clock from firmware
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@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/boards/raspberry-pi/rpi-common.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/boards/raspberry-pi/rpi-common.c b/arch/arm/boards/raspberry-pi/rpi-common.c index 887f096f7e..f22239c7cc 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"); |