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>;
> 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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