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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--
Beninio Mbila
--
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