hi
@igorpadykov
step 1
I have successfully added the rtc spi m41t39 in maaxbaord.
I have fixed the issue,
the spi cs pin is wrong in dts file
it should change to cs-gpios = <&gpio5 9 0 > ; from cs-gpios = <&gpio5 13 0 > ;
I checked the imx8mq processor hardware datasheet
the ecsp1_ss0 is gpio5.io9 not io13.
the gpio5.io13 is ecsp2_ss0 , wrong at here.
correct:
237 pinctrl_ecspi1: ecspi1grp {
238 fsl,pins = <
239 MX8MQ_IOMUXC_ECSPI1_SS0_GPIO5_IO9 0x16
240 MX8MQ_IOMUXC_ECSPI1_MOSI_ECSPI1_MOSI 0x16
241 MX8MQ_IOMUXC_ECSPI1_MISO_ECSPI1_MISO 0x16
242 MX8MQ_IOMUXC_ECSPI1_SCLK_ECSPI1_SCLK 0x1816
243 >;
244 };
&ecspi1{
fsl,spi-num-chipselects = < 1 >;
cs-gpios = <&gpio5 9 0 > ;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1 >;
status = "okay";
#address-cells=<1>;
#size-cells=<0>;
rtc@0x00{
#address-cellss=<1>;
#size-cells=<1>;
compatible = "rtc-m41t93";
spi-max-frequency = <5000000>;
reg = <0>;
};
};
step 2. config m41t39 in kernel config.
NOT use module, need to build in kernel. because if use module. every time after kernel start up, the module should insert and the time should reset again so that it seems does not work.
