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Old 02-14-2017, 07:53 AM   #1
mr.simo
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Registered: Feb 2010
Posts: 71

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Beaglebone Black: setting MMC1 pins as GPIO


Hi all,

I am using a Beaglebone Black and I am trying to reconfigure some pins of the P8 connector as GPIO, for example, the P8_5 pin.

As shown here, all the P8 connectors are reconfigurable.

Yesterday I started this thread and I came up with the solution of using this tool which generates the dts automatically.

The dtbo file is generated successfully but it doesn't work...
They seems to be loaded:
Code:
cat /sys/bus/platform/drivers/bone_capemgr/bone_capemgr/slots
 0: PF----  -1 
 1: PF----  -1 
 2: PF----  -1 
 3: PF----  -1 
 4: P-O-L-   0 Override Board Name,00A0,Override Manuf,BB-SPIDEV0
16: P-O-L-   1 Override Board Name,00A0,Override Manuf,bspm_P8_20_17
17: P-O-L-   2 Override Board Name,00A0,Override Manuf,bspm_P8_21_17
18: P-O-L-   3 Override Board Name,00A0,Override Manuf,bspm_P8_22_17
19: P-O-L-   4 Override Board Name,00A0,Override Manuf,bspm_P8_23_17
20: P-O-L-   5 Override Board Name,00A0,Override Manuf,bspm_P8_24_17
21: P-O-L-   6 Override Board Name,00A0,Override Manuf,bspm_P8_25_17
22: P-O-L-   7 Override Board Name,00A0,Override Manuf,bspm_P8_3_17
23: P-O-L-   8 Override Board Name,00A0,Override Manuf,bspm_P8_4_17
24: P-O-L-   9 Override Board Name,00A0,Override Manuf,bspm_P8_5_17
25: P-O-L-  10 Override Board Name,00A0,Override Manuf,bspm_P8_6_17
but dmesg output reports that the pins are already claimed for the mmc peripheral. Here is a cutted output of dmesg:

Code:
[   52.195166] bone_capemgr bone_capemgr: slot #5: 'Override Board Name,00A0,Override Manuf,bspm_P8_20_17'
[   52.216580] pinctrl-single 44e10800.pinmux: pin 44e10884.0 already requested by 481d8000.mmc; cannot claim for ocp:bs_pinmode_P8_20_0x17_pinmux
[   52.229772] pinctrl-single 44e10800.pinmux: pin-33 (ocp:bs_pinmode_P8_20_0x17_pinmux) status -22
[   52.238741] pinctrl-single 44e10800.pinmux: could not request pin 33 (44e10884.0) from group pinmux_bs_pinmode_P8_20_0x17  on device pinctrl-single
[   52.252145] bone-pinmux-helper ocp:bs_pinmode_P8_20_0x17_pinmux: Error applying setting, reverse things back
[   52.326758] pinctrl-single 44e10800.pinmux: pin 44e10884.0 already requested by 481d8000.mmc; cannot claim for ocp:bs_pinmode_P8_20_0x17_pinmux
[   52.339942] pinctrl-single 44e10800.pinmux: pin-33 (ocp:bs_pinmode_P8_20_0x17_pinmux) status -22
[   52.348992] pinctrl-single 44e10800.pinmux: could not request pin 33 (44e10884.0) from group pinmux_bs_pinmode_P8_20_0x17  on device pinctrl-single
[   52.362364] bone-pinmux-helper ocp:bs_pinmode_P8_20_0x17_pinmux: Error applying setting, reverse things back
[   52.372324] bone-pinmux-helper ocp:bs_pinmode_P8_20_0x17_pinmux: Failed to select default state
[   52.397242] ------------[ cut here ]------------
[   52.397336] WARNING: CPU: 0 PID: 1716 at drivers/base/devres.c:888 bone_pinmux_helper_probe+0x151/0x1c8()
[   52.397359] Modules linked in: snd_soc_hdmi_codec spidev snd_soc_simple_card omap_sham omap_aes_driver omap_rng rng_core tilcdc snd_soc_davinci_mcasp snd_soc_edma snd_soc_omap snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore spi_omap2_mcspi evdev tda998x uio_pdrv_genirq uio bnep usb_f_ecm g_ether usb_f_rndis u_ether libcomposite bluetooth rfkill
[   52.397648] CPU: 0 PID: 1716 Comm: cut Not tainted 4.4.20-ti-r43 #1
[   52.397670] Hardware name: Generic AM33XX (Flattened Device Tree)
[   52.397745] [<c0015b81>] (unwind_backtrace) from [<c00123f9>] (show_stack+0x11/0x14)
[   52.397804] [<c00123f9>] (show_stack) from [<c03c99e3>] (dump_stack+0x73/0x80)
[   52.397872] [<c03c99e3>] (dump_stack) from [<c00310a3>] (warn_slowpath_common+0x6b/0x94)
[   52.397917] [<c00310a3>] (warn_slowpath_common) from [<c0031173>] (warn_slowpath_null+0x17/0x1c)
[   52.397958] [<c0031173>] (warn_slowpath_null) from [<c04afb35>] (bone_pinmux_helper_probe+0x151/0x1c8)
[   52.398011] [<c04afb35>] (bone_pinmux_helper_probe) from [<c0496aa7>] (platform_drv_probe+0x37/0x7c)
[   52.398055] [<c0496aa7>] (platform_drv_probe) from [<c049540b>] (driver_probe_device+0x193/0x344)
[   52.398111] [<c049540b>] (driver_probe_device) from [<c0493d81>] (bus_for_each_drv+0x51/0x80)
[   52.398154] [<c0493d81>] (bus_for_each_drv) from [<c04951b9>] (__device_attach+0x81/0xe8)
[   52.398192] [<c04951b9>] (__device_attach) from [<c04949af>] (bus_probe_device+0x5b/0x60)
[   52.398232] [<c04949af>] (bus_probe_device) from [<c04932d3>] (device_add+0x303/0x430)
[   52.398293] [<c04932d3>] (device_add) from [<c05c3eb9>] (of_platform_device_create_pdata+0x61/0x84)
[   52.398343] [<c05c3eb9>] (of_platform_device_create_pdata) from [<c05c3f6d>] (of_platform_notify+0x85/0xb8)
[   52.398400] [<c05c3f6d>] (of_platform_notify) from [<c0048f6b>] (notifier_call_chain+0x4b/0x68)
[   52.398450] [<c0048f6b>] (notifier_call_chain) from [<c00491a9>] (__blocking_notifier_call_chain+0x2d/0x3c)
[   52.398499] [<c00491a9>] (__blocking_notifier_call_chain) from [<c00491cf>] (blocking_notifier_call_chain+0x17/0x1c)
[   52.398549] [<c00491cf>] (blocking_notifier_call_chain) from [<c05c4bad>] (__of_changeset_entry_notify+0x65/0xa4)
[   52.398598] [<c05c4bad>] (__of_changeset_entry_notify) from [<c05c51e9>] (__of_changeset_apply+0x65/0x100)
[   52.398647] [<c05c51e9>] (__of_changeset_apply) from [<c05c8c4d>] (__of_overlay_create+0x2ed/0x46c)
[   52.398692] [<c05c8c4d>] (__of_overlay_create) from [<c04b043b>] (capemgr_load_slot+0x2df/0x45c)
[   52.398734] [<c04b043b>] (capemgr_load_slot) from [<c04b1a15>] (slots_store+0xf1/0x244)
[   52.398789] [<c04b1a15>] (slots_store) from [<c018a0a3>] (kernfs_fop_write+0x87/0x150)
[   52.398843] [<c018a0a3>] (kernfs_fop_write) from [<c0136e4d>] (vfs_write+0x65/0x12c)
[   52.398886] [<c0136e4d>] (vfs_write) from [<c013752b>] (SyS_write+0x3f/0x80)
[   52.398937] [<c013752b>] (SyS_write) from [<c000ec41>] (ret_fast_syscall+0x1/0x52)
[   52.398963] ---[ end trace 112c5f67b59b3ede ]---
[   52.399041] bone-pinmux-helper: probe of ocp:bs_pinmode_P8_20_0x17_pinmux failed with error -22
[   52.399767] bone_capemgr bone_capemgr: slot #5: dtbo 'bspm_P8_20_17-00A0.dtbo' loaded; overlay id #1
[   52.458545] bone_capemgr bone_capemgr: part_number 'bspm_P8_21_17', version 'N/A'
[   52.458614] bone_capemgr bone_capemgr: slot #6: override
[   52.458657] bone_capemgr bone_capemgr: Using override eeprom data at slot 6
[   52.458701] bone_capemgr bone_capemgr: slot #6: 'Override Board Name,00A0,Override Manuf,bspm_P8_21_17'
[   52.482362] pinctrl-single 44e10800.pinmux: pin 44e10880.0 already requested by 481d8000.mmc; cannot claim for ocp:bs_pinmode_P8_21_0x17_pinmux
[   52.495364] pinctrl-single 44e10800.pinmux: pin-32 (ocp:bs_pinmode_P8_21_0x17_pinmux) status -22
[   52.504230] pinctrl-single 44e10800.pinmux: could not request pin 32 (44e10880.0) from group pinmux_bs_pinmode_P8_21_0x17  on device pinctrl-single
[   52.517525] bone-pinmux-helper ocp:bs_pinmode_P8_21_0x17_pinmux: Error applying setting, reverse things back
[   52.553454] pinctrl-single 44e10800.pinmux: pin 44e10880.0 already requested by 481d8000.mmc; cannot claim for ocp:bs_pinmode_P8_21_0x17_pinmux
[   52.566500] pinctrl-single 44e10800.pinmux: pin-32 (ocp:bs_pinmode_P8_21_0x17_pinmux) status -22
[   52.575378] pinctrl-single 44e10800.pinmux: could not request pin 32 (44e10880.0) from group pinmux_bs_pinmode_P8_21_0x17  on device pinctrl-single
[   52.588675] bone-pinmux-helper ocp:bs_pinmode_P8_21_0x17_pinmux: Error applying setting, reverse things back
[   52.598564] bone-pinmux-helper ocp:bs_pinmode_P8_21_0x17_pinmux: Failed to select default state
[   52.612985] ------------[ cut here ]------------
I am quiet new to dts so I have some doubt.
How can I re-assing these pins successfully, disabling the mmc pins ?

Thank you in advance.
Simon
 
Old 06-21-2017, 12:26 PM   #2
bhboyle
LQ Newbie
 
Registered: Jun 2017
Posts: 2

Rep: Reputation: Disabled
Did you ever solve this?

Simon.

I am having the same problem with the same pin. Did you ever resolve this issue?
 
Old 06-22-2017, 03:17 AM   #3
mr.simo
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Registered: Feb 2010
Posts: 71

Original Poster
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Hello bhboyle,

The solution was to comment the use of HDMI dedicated device-tree from uEnv.txt file, since by default settings, that pin and more others are dedicated to this purpose, and I did not need to use HDMI.

Regards,
Simon
 
Old 06-22-2017, 06:33 AM   #4
bhboyle
LQ Newbie
 
Registered: Jun 2017
Posts: 2

Rep: Reputation: Disabled
Great I will give that a try.

Thanks.
 
  


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