Userspace driver and clocks

mod42 — Wed, 08 Apr 2015 08:36:27 GMT

We have a special requirement regarding image processing which could be solved using the PXP. I wanted to write a user space IO driver to do this. My current problem is that the clock to the PXP is not enabled. I tried to use the uio_pdrv_genirq for the first tests and added the following device tree entry:

pxp@02218000 {

compatible = "gs-pxp";

reg = <0x02218000 0x4000>;

reg-names = "pxp"; /* Names of the zones */

interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;

clocks = <&clks IMX6SX_CLK_PXP_AXI>,

<&clks IMX6SX_CLK_DISPLAY_AXI>;

clock-names = "pxp-axi", "disp-axi";

status = "okay";

};

The uio device is created correctly but when I open the device the clock in the CCM is not ungated. Do I have to do write my own uio kernel driver when clocks have to be enabled? Or is it possible to enable clocks from user space?

Re: Userspace driver and clocks

igorpadykov — Thu, 09 Apr 2015 10:00:53 GMT

Hi Matthias

pxp is supported only on sabresd board and for its usage one

can look at tests in imx-test-3.10.53-1.1.0 L3.10.53_1.1.0_iMX6SX_Bundle :

i.MX 6 SoloX Linux

Best regards

igor

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Userspace driver and clocks

Re: Userspace driver and clocks