On 2017-01-19 19:34, Peter Rosin wrote:
> On 2017-01-19 19:03, Adrian Fiergolski wrote:
>> Hi,
>>
>> I haven't found any information regarding support for nested i2c muxes.
>> Is the below device tree supported by the current driver ?
>
> No, it is not since you cannot have two devices with address 0x74
> visible at the same time. You would have to set a different address
> on one of the muxes using its A0-A2 pins. Then it should work.
>
> Look in Documentation/i2c/i2c-topology for more information.
>
> Cheers,
> peda
>
>> &i2c0 {
>> status = "okay";
>> clock-frequency = <400000>;
>> pinctrl-names = "default";
>> pinctrl-0 = <&pinctrl_i2c0_default>;
>>
>> i2cswitch@74 {
>> compatible = "nxp,pca9548";
>> #address-cells = <1>;
>> #size-cells = <0>;
>> reg = <0x74>;
>>
>> i2c@0 {
>> #address-cells = <1>;
>> #size-cells = <0>;
>> reg = <0>;
>> si570: clock-generator@5d {
>> #clock-cells = <0>;
>> compatible = "silabs,si570";
>> temperature-stability = <50>;
>> reg = <0x5d>;
>> factory-fout = <156250000>;
>> clock-frequency = <148500000>;
>> };
>> };
>>
>> i2c@2 {
>> #address-cells = <1>;
>> #size-cells = <0>;
>> reg = <5>;
Also, this <5> is bogus. It should match the @2 a few lines up.
Cheers,
peda
>> i2cswitch_hpc@74 {
>> compatible = "nxp,pca9548";
>> #address-cells = <1>;
>> #size-cells = <0>;
>> reg = <0x74>;
>> hpc_caribou_sources_enable@76 {
>> compatible= "nxp,pca9539";
>> #address-cells = <1>;
>> #size-cells = <0>;
>> reg = <0x76>;
>> };
>> };
>>
>> };
>>
>> };
>>
>> };
>>
>> With such tree I am getting error
>>
>> [2.173385] i2c i2c-2: of_i2c: invalid addr=0 on
>> /amba/i2c@e0004000/i2cswitch@74/i2c@2/i2cswitch_hpc@74
>>
>>
>> Regards,
>>
>> Adrian Fiergolski
>>
>>
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>
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