There is no CS output with weim bus

[BH1SVR]

Hello. We designed a board which connected LAN9221 (an ethernet chip) to i.MX 6ULL‘s weim bus. LAN9221 is the only device on weim bus. The following is the device tree.

&weim {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_weim>;
	status = "okay";
        #address-cells = <2>;
	#size-cells = <1>;
        ranges = <0 0 0x50000000 0x08000000>;
        clocks = <&clks IMX6UL_CLK_EIM_SLOW_PODF>,
                 <&clks IMX6UL_CLK_IPG>;
        fsl,weim-cs-gpr = <&gpr>;
        lan9221@0,0 {
		compatible = "smsc,lan9115";
                pinctrl-names = "default";
  	        pinctrl-0 = <&pinctrl_lan9221>;
                smsc,irq-push-pull;
       		reg = <0 0x0 0x1000>;
                reg-shift = <1>;
                reg-io-width = <2>;
                fsl,weim-cs-timing = <0x30610001 0x00001002 0x1c324444 0x00000000 0x1c680924 0x00000000>;
                interrupt-parent = <&gpio1>;
                interrupts = <1 IRQ_TYPE_LEVEL_LOW>;
                phy-mode = "mii";
                reset-pin = <&gpio2 16 GPIO_ACTIVE_LOW>;
	};
};

 LAN9221's driver tries to read regs during probe, but there is no CS output with oscilloscope watching.

I think  the clock is down maybe, and try to read CCM_CCGR6 reg before accessing LAN9221, the reg is 0xFFFFFFFF. 

 Please help me find where the problem comes from. Thanks.

[Sanket_Parekh]

Hi @BH1SVR ,

I hope you are doing well.

Please provide me with the boot logs to verify that driver is correctly registered and the clock is enabled.

Thanks & Regards

Sanket Parekh