my i2cdetect show the following and we can see that expand 20 is still free:
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-1 using read byte commands.
I will probe address range 0x03-0x77.
Continue? [Y/n] y
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: 20 UU UU -- UU -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
2016-02-03 12:16 GMT+01:00 Beninio Mbila <[email protected]>:
> Hello Graham,
> Thanks for tour quick reply, I am using Debian 8 Jessie indeed.
>
> *I have modified my dts as following and it is working fine expect the
> expander at adress 0x20 I don't know why?*
>
> &i2c2 {
>
> clock-frequency = <400000>;
> status = "okay";
>
>
>
>
> *pca953x_0:gpio@20 { compatible = "nxp, pca9535"; reg =
> <0x20>; }*;
> pca953x_1:gpio@21 {
> compatible = "nxp,pca9535";
> reg = <0x21>;
> };
>
> pca953x_2:gpio@22 {
> compatible = "nxp,pca9535";
> reg = <0x22>;
> };
>
> pca953x_3gpio@24 {
> compatible = "nxp,pca9535";
> reg = <0x24>;
> };
> *It looks like the gpio adress from 1024 to gpio1040 are forbidden? see my
> log below:*
>
> GPIOs 976-991, i2c/1-0024, pca9535, can sleep:
> gpio-976 (sysfs ) in lo
> gpio-977 (sysfs ) in lo
> gpio-978 (sysfs ) in lo
> gpio-979 (sysfs ) in lo
> gpio-980 (sysfs ) in lo
> gpio-981 (sysfs ) in lo
> gpio-982 (sysfs ) in lo
> gpio-983 (sysfs ) in lo
> gpio-984 (sysfs ) in lo
> gpio-985 (sysfs ) in lo
> gpio-986 (sysfs ) in lo
> gpio-987 (sysfs ) in lo
> gpio-989 (sysfs ) in lo
> gpio-990 (sysfs ) in hi
> gpio-991 (sysfs ) in lo
>
> GPIOs 992-1007, i2c/1-0022, pca9535, can sleep:
> gpio-992 (sysfs ) in lo
> gpio-993 (sysfs ) in lo
> gpio-994 (sysfs ) in lo
> gpio-995 (sysfs ) in lo
> gpio-996 (sysfs ) in lo
> gpio-997 (sysfs ) in lo
> gpio-998 (sysfs ) in lo
> gpio-999 (sysfs ) in lo
> gpio-1000 (sysfs ) in lo
> gpio-1001 (sysfs ) in lo
> gpio-1002 (sysfs ) in lo
> gpio-1003 (sysfs ) in lo
> gpio-1004 (sysfs ) in lo
> gpio-1005 (sysfs ) in lo
> gpio-1006 (sysfs ) in lo
> gpio-1007 (sysfs ) in lo
>
> GPIOs 1008-1023, i2c/1-0021, pca9535, can sleep:
> gpio-1008 (sysfs ) in lo
> gpio-1009 (sysfs ) in lo
> gpio-1010 (sysfs ) in lo
> gpio-1011 (sysfs ) in lo
> gpio-1012 (sysfs ) in lo
> gpio-1013 (sysfs ) in lo
> gpio-1014 (sysfs ) in lo
> gpio-1015 (sysfs ) in lo
> gpio-1016 (sysfs ) in lo
> gpio-1017 (sysfs ) in lo
> gpio-1018 (sysfs ) in lo
> gpio-1019 (sysfs ) in lo
> gpio-1020 (sysfs ) in lo
> gpio-1021 (sysfs ) in lo
> gpio-1022 (sysfs ) in lo
> gpio-1023 (sysfs ) out hi
>
>
> 2016-02-02 22:32 GMT+01:00 Graham <[email protected]>:
>
>> You didn't say which version of OS you were running.
>> The I2C busses were renumbered in later OS.
>> Since you mentioned kernel 4.1.15, I will assume that you are running
>> Debian 8
>>
>> In Debian 8, I2C2 is pinned out to P9-19 and P9-20 by default. (No device
>> tree changes necessary.)
>> Hook your expander there and see if you can see it with i2cdetect.
>>
>> --- Graham
>>
>> ==
>>
>>
>> On Tuesday, February 2, 2016 at 4:54:55 AM UTC-6, malkowki_belgium wrote:
>>>
>>> Hello all,
>>>
>>> I am trying to add the PCA 9535 expander on the i2c2 bus on P9. 23 and
>>> P9.24 using the device tree but I cannot detect it when booting the board
>>> with the kernel 4.1.15.
>>> below the way I declare the device on the DTS.
>>>
>>> Do you know what I am doing wrong?
>>>
>>> &omap3_pmx_core {
>>> pinctrl-names = "default";
>>> pinctrl-0 = <
>>> &hsusb2_pins
>>> >;
>>> i2c2_pins: pinmux_i2c_pins {
>>> pinctrl-single,pins = <
>>> 0x18E (PIN_INPUT_PULLUP | MUX_MODE0) /*
>>> i2c2_scl.gpio_168 */
>>> 0x190 (PIN_INPUT_PULLUP | MUX_MODE0) /*
>>> i2c2_sda.gpio_136 */
>>>
>>> >;
>>> };
>>>
>>> &i2c2 {
>>>
>>> clock-frequency = <400000>;
>>>
>>> pca9535: gpio@20 {
>>> compatible = "nxp, pca9535";
>>> gpio-controller;
>>> #gpio-cell = <2>;
>>> reg = <0x20>;
>>> status = "okay";
>>>
>>> };
>>>
>>> gpio@21 {
>>> compatible = "nxp, pca9535";
>>> gpio-controller;
>>> #gpio-cell = <2>;
>>> reg = <0x21>;
>>> status = "okay";
>>>
>>> };
>>> gpio@22 {
>>> compatible = "nxp, pca9535";
>>> gpio-controller;
>>> status = "okay";
>>> #gpio-cell = <2>;
>>> reg = <0x22>;
>>>
>>> };
>>> gpio@24 {
>>> compatible = "nxp, pca9535";
>>> gpio-controller;
>>> status = "okay";
>>> #gpio-cell = <2>;
>>> reg = <0x24>;
>>>
>>> };
>>> };
>>>
>>> &gpio5 {
>>> pinctrl-names = "defaults";
>>> pinctrl-0 = <
>>> &gpio_pins
>>> &i2c2_pins
>>>
>>> >;
>>> };
>>>
>>>
>>> --
>> For more options, visit http://beagleboard.org/discuss
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>
>
>
>
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