Pinmuxed specific pins to SPI, kernel is trying to use pins not specified and returning error that pins are already used

Technical Support
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1

I mofied SPI1 in the device tree to use specific pins:
MX6QDL_PAD_DISP0_DAT22__ECSPI1_MISO
0x0ec 0x400 0x7dc 0x2 0x1 0x100b1
MX6QDL_PAD_DISP0_DAT21__ECSPI1_MOSI
0x0e8 0x3fc 0x7e0 0x2 0x1 0x100b1
MX6QDL_PAD_DISP0_DAT20__ECSPI1_SCLK
0x0e4 0x3f8 0x7d8 0x2 0x1 0x100b1
MX6QDL_PAD_DISP0_DAT23__ECSPI1_SS0
0x0f0 0x404 0x7e4 0x2 0x1 0xb1

In the kmsg I get this error:

3,140,1300801,-;imx6dl-pinctrl 20e0000.iomuxc: pin MX6DL_PAD_EIM_EB1 already requested by 20e0000.iomuxc; cannot claim for 2008000.spi
 SUBSYSTEM=platform
 DEVICE=+platform:20e0000.iomuxc
3,141,1316450,-;imx6dl-pinctrl 20e0000.iomuxc: pin-114 (2008000.spi) status -22
 SUBSYSTEM=platform
 DEVICE=+platform:20e0000.iomuxc
3,142,1325401,-;imx6dl-pinctrl 20e0000.iomuxc: could not request pin 114 (MX6DL_PAD_EIM_EB1) from group ecspi1grp  on device 20e0000.iomuxc
 SUBSYSTEM=platform
 DEVICE=+platform:20e0000.iomuxc
3,143,1341406,-;spi_imx 2008000.spi: Error applying setting, reverse things back
 SUBSYSTEM=platform
 DEVICE=+platform:2008000.spi
4,144,1350529,-;spi_imx: probe of 2008000.spi failed with error -22

 I double checked that I assigned the correct values in iomuxc but for some reason the log says that the kernel was trying to assign "MX6DL_PAD_EIM_EB1" to spi@2008000, which has already been requested by 20e0000.iomuxc. I tried to find out where this pin leads too in the imx6dl-pinfunc.h and imx6q-pinfunc.h files but it doesn't point to a specific ball name, just the general group of options for _EIM_EB1.  I'm not sure why it's attempting to use pads I didn't request.

I’ve attached a copy of my device tree .dts file and the full kmsg log from my last run.

Thank you.

link text

2

link text

3

Sorry for the confusing post, I’m trying to get used to posting code block and etc.

4

What exact hardware (module and carrier board) and software (also downstream vs. mainline/upstream) versions of things are you talking about?

5

Colibri iMX6 256 MB IT version. Custom carrier board I designed myself. I’m using the Embedded Linux Minimal Image as a starting point. We are connecting an ArduCAM OV5642 to SPI and I2C. A the moment we’re focusing on pinmux for SPI and we’re getting the error above.

ECSPI1 seems to be trying to use pin 114 MX6DL_PAD_EIM_EB1 which is already taken up by another node, even though I didn’t request it to use that pin.

6

Our software is custom software we’re making to use the cameras, but it’s high level compared to the device tree we’re trying to figure out now.

7

I don’t suppose anyone has any idea what’s wrong?

8

I tried to find out where this pin leads too in the imx6dl-pinfunc.h and imx6q-pinfunc.h files but it doesn’t point to a specific ball name,

You should look not in *.h files but in related *.dts and *.dtsi files in arch/arm/boot/dts, file pattern perhaps imx6*. There are some matches in imx6qdl-colibri.dtsi and others. pinctrl_wem_gpio_4 group includes your pad, and group is included in imx6dl-colibri-eval-v3.dts.

9

Please read this.