how to get or initialize clock in L4Linux
martin.schroeder at openlimit.com
Fri Aug 8 12:20:45 CEST 2014
Am 08.08.2014 um 10:49 schrieb Yunchuan Geng:
> Hi, L4hackers,
> I am implementing I2C drivers from native linux to L4Linux. I am using
> Freescale iMX6Q SD board. Kernel version 3.14
> in ./drivers/i2c/busses/i2c-imx.c, function i2c_imx_probe(),
> devm_clk_get() is called. And fails at here. I understand that clock are
> initialized from function "__init imx6q_clocks_init()".
> I managed to compile and call the imx6q_clocks_init() function from
> L4Linux, but encountered many problem.
> The question is, Is it necessary to initialize clocks in L4Linux and how?
I had the same problem with clocking of the network driver in
fec_main.c. My approach is to do the clock setup outside of l4linux,
preferably let the bootloader (U-Boot) do this for me. So when the
driver is probed all clock setup can be skipped in the driver.
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