HELP:Kernel Panic after enabling IIO-HWMON driver in DTS

[A, Maheswari]

Hi,



I have already enabled IIO-HWMON and ASPEED_ADC drivers in linux configuration file.



Included  changes in my platform DTS file.



    iio-hwmon {

+                compatible = "iio-hwmon";

+                io-channels = <&adc 12>;

+        };

@@ -334,3 +339,8 @@

+&adc

+{

+       status = "okay";

+};



We are getting the below Kernel panic after this IIO-HWMON driver changes in DTS file.



Other platform are using this iio-hwmon driver. Please let us know if anyone faced this same issue.





[    3.761575] ==== 1. IIO_HWMON Probe === [    3.765477] Unable to handle kernel paging request at virtual address fffffdfb [    3.772710] pgd = f5dd9e82 [    3.775426] [fffffdfb] *pgd=9effd861, *pte=00000000, *ppte=00000000 [    3.781715] Internal error: Oops: 37 [#1] ARM [    3.786073] Modules linked in:

[    3.789148] CPU: 0 PID: 1 Comm: swapper Not tainted 4.18.8 #1 [    3.794892] Hardware name: Generic DT based system [    3.799706] PC is at iio_hwmon_probe+0xb4/0x3e4 [    3.804235] LR is at   (null) [    3.807207] pc : [<804eb7a0>]    lr : [<00000000>] psr: a0000013 [    3.813465] sp : 9e477d70  ip : 9e5b4550  fp : 9e477dbc [    3.818681] r10: 00000000  r9 : 00000000  r8 : 80b51d1c [    3.823900] r7 : 9e5b4410  r6 : 9e6f2290  r5 : 00000000  r4 : 9e5b4400 [    3.830418] r3 : 00000000  r2 : fffffdfb  r1 : 00000000  r0 : fffffdfb [    3.836936] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM Segment none [    3.844068] Control: 00c5387d  Table: 9e764008  DAC: 00000051 [    3.849811] Process swapper (pid: 1, stack limit = 0x2b33fe0f) [    3.855639] Stack: (0x9e477d70 to 0x9e478000) [    3.860004] 7d60:                                     9e5b4400

9ec1af90 fffffdfb 9e477d88

[    3.868179] 7d80: 8029ea9c 8029ae0c 9e5b4410 7e82968c 9e5b4418

9e5b4410 00000000 80b51d1c

[    3.876361] 7da0: 00000000 80b51d1c 00000000 00000000 9e477ddc

9e477dc0 804488f0 804eb6f8

[    3.884541] [.......]

00000000 00000000 00000000

[    4.023518] 7fe0: 00000000 00000000 00000000 00000000 00000013

00000000 00000000 00000000

[    4.031740] [<804eb7a0>] (iio_hwmon_probe) from [<804488f0>]

(platform_drv_probe+0x58/0xa8)

[    4.040118] [<804488f0>] (platform_drv_probe) from [<80446790>]

(driver_probe_device+0x2f8/0x474)

[    4.048999] [<80446790>] (driver_probe_device) from [<80446a0c>]

(__driver_attach+0x100/0x12c)

[    4.057620] [<80446a0c>] (__driver_attach) from [<804443a4>]

(bus_for_each_dev+0x80/0xc4)

[    4.065802] [<804443a4>] (bus_for_each_dev) from [<80445f14>]

(driver_attach+0x28/0x30)

[    4.073811] [<80445f14>] (driver_attach) from [<8044582c>]

(bus_add_driver+0x154/0x268)

[    4.081832] [<8044582c>] (bus_add_driver) from [<804475f8>]

(driver_register+0x84/0x118)

[    4.089933] [<804475f8>] (driver_register) from [<80448834>]

(__platform_driver_register+0x3c/0x50)

[    4.099003] [<80448834>] (__platform_driver_register) from [<80a26f24>] (iio_hwmon_driver_init+0x20/0x28) [    4.108593] [<80a26f24>] (iio_hwmon_driver_init) from [<80102e20>]

(do_one_initcall+0x4c/0x18c)

[    4.117323] [<80102e20>] (do_one_initcall) from [<80a0116c>]

(kernel_init_freeable+0x1a0/0x270)

[    4.126038] [<80a0116c>] (kernel_init_freeable) from [<806a7e6c>]

(kernel_init+0x18/0x128)

[    4.134315] [<806a7e6c>] (kernel_init) from [<801010e8>]

(ret_from_fork+0x14/0x2c)

[    4.141882] Exception stack(0x9e477fb0 to 0x9e477ff8) [    4.146937] 7fa0:                                     00000000

00000000 00000000 00000000

[    4.155112] 7fc0: 00000000 00000000 00000000 00000000 00000000

00000000 00000000 00000000

[    4.163282] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [    4.169903] Code: e0831083 e5860000 e1a01101 e0802001 (e7901001) [    4.176192] ---[ end trace 95853ce787f427d0 ]--- [    4.180830] Kernel panic - not syncing: Fatal exception



Thanks

Maheswari A
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