Perform full reset on AD9361 from running Linux (Zynq)

I have a use-case where either,

(1) the AD9361 may go through a hard reset (toggle voltage rail)

(2) the Zynq FPGA may be reloaded while Linux is running (/dev/xdevcfg).

After this I would like to perform whatever necessary steps there are to reset everything needed to use the AD9361 again like the system is coming up out of a fresh boot.

So without doing either (1) or (2) I want to just prove I can reset everything on a working image... I'm trying to follow this older post and hope it is still relevant. The two major issues I have with this are that I can't figure out how to assert the RESETB pin as it it looks to be held up by the ADI driver and I can't seem to unbind the driver following the steps from the linked post :

~/unit_test/support # ls /sys/bus/platform/drivers/dma-axi-dmac/unbind
/sys/bus/platform/drivers/dma-axi-dmac/unbind
~/unit_test/support # echo 7c40000.dma > /sys/bus/platform/drivers/dma-axi-dmac/
unbind
sh: write error: No such device

Attempting to write to the RESETB pin using the GPIO system in Linux I get a "Device or resource busy" error (same when writing to the sync pin). I can write to the EN_AGC pin just fine.

Thanks

Some additional snippets which may/may not be useful

dmesg @ startup :

~/unit_test/support # dmesg | grep ad9361
[    5.762957] ad9361 spi32766.0: ad9361_probe : enter (ad9361)
[    6.040763] ad9361 spi32766.0: ad9361_probe : AD936x Rev 2 successfully initialized
[    7.007410] cf_axi_adc 79020000.cf-ad9361-lpc: ADI AIM (10.00.b) at 0x79020000 mapped to 0xf0bc8000, probed ADC AD9361 as MASTER
[    7.033738] cf_axi_dds 79024000.cf-ad9361-dds-core-lpc: Analog Devices CF_AXI_DDS_DDS MASTER (9.00.b) at 0x79024000 mapped to 0xf0bed000, probed DDS AD9361

relevant dts :

        // https://www.kernel.org/doc/Documentation/devicetree/bindings/dma/adi%2Caxi-dmac.txt
        rx_dma: dma@7c400000 {
                compatible = "adi,axi-dmac-1.00.a";
                reg = <0x7c400000 0x10000>;
                interrupts = <0 59 0>;
                clocks = <&clkc 16>;
                #dma-cells = <1>;
                // adi,channels {
                //     #size-cells = <0>;
                //     #address-cells = <1>;

                //     dma-channel@0 {
                //             reg = <0x0>;
                //             adi,length-width = <0x18>;
                //             adi,source-bus-width = <0x40>;
                //             adi,destination-bus-width = <0x40>;
                //             adi,source-bus-type = <0x2>;
                //             adi,destination-bus-type = <0x0>;
                //     };
                // };
                dma-channel {
                        adi,buswidth = <64>;
                        adi,type = <0>;
                };
        };

        // https://www.kernel.org/doc/Documentation/devicetree/bindings/dma/adi%2Caxi-dmac.txt
        tx_dma: dma@7c420000 {
                compatible = "adi,axi-dmac-1.00.a";
                reg = <0x7c420000 0x10000>;
                interrupts = <0 58 0>;
                clocks = <&clkc 16>;
                #dma-cells = <1>;
                // adi,channels {
                //     #size-cells = <0>;
                //     #address-cells = <1>;

                //     dma-channel@0 {
                //             reg = <0x0>;
                //             adi,length-width = <0x18>;
                //             adi,source-bus-width = <0x40>;
                //             adi,destination-bus-width = <0x40>;
                //             adi,source-bus-type = <0x0>;
                //             adi,destination-bus-type = <0x2>;
                //             adi,cyclic;
                //     };
                // };
                dma-channel {
                        adi,buswidth = <64>;
                        adi,type = <1>;
                        adi,cyclic;
                };
        };

        cf_ad9361_adc_core_0: cf-ad9361-lpc@79020000 {
                compatible = "adi,axi-ad9361-6.00.a";
                reg = <0x79020000 0x6000>;
                dmas = <&rx_dma 0>;
                dma-names = "rx";
                spibus-connected = <&adc0_ad9361>;
                xlnx,dphase-timeout = <0x8>;
                xlnx,num-mem = <0x1>;
                xlnx,num-reg = <0x1>;
                xlnx,s-axi-min-size = <0x1ff>;
                xlnx,slv-awidth = <0x20>;
                xlnx,slv-dwidth = <0x20>;
                xlnx,use-wstrb = <0x0>;
        };

        cf_ad9361_dac_core_0: cf-ad9361-dds-core-lpc@79024000 {
                compatible = "adi,axi-ad9361-dds-6.00.a";
                reg = <0x79024000 0x1000>;
                clocks = <&adc0_ad9361 13>;
                clock-names = "sampl_clk";
                dmas = <&tx_dma 0>;
                dma-names = "tx";
                dac-sample-frequency = <491520000>;
                xlnx,dphase-timeout = <0x8>;
                xlnx,num-mem = <0x1>;
                xlnx,num-reg = <0x1>;
                xlnx,s-axi-min-size = <0x1ff>;
                xlnx,slv-awidth = <0x20>;
                xlnx,slv-dwidth = <0x20>;
                xlnx,use-wstrb = <0x0>;
        };

&adc0_ad9361 {
        en_agc-gpios = <&gpio0 55 0>;
        sync-gpios = <&gpio0 56 0>;
        reset-gpios = <&gpio0 54 0>;
};