I am working on pwm audio driver, i got some pwm driver from below link:
GitHub - Glowforge/kernel-module-imx-pwm-audio: i.MX6 PWM audio driver
Please look at this driver once from above..............................
| code from driver... "sdma-params" passing from device tree |
|---|
/* Read SDMA channel number and load address */
if (of_property_read_u32_array(pdev->dev.of_node, "sdma-params",
sdma_params, ARRAY_SIZE(sdma_params)) == 0) {
// if (of_property_read_u32_array(pdev->dev.of_node, NULL,
// NULL,0)) {
self->sdma_ch_num = sdma_params[0];
self->sdma_script_origin = sdma_params[1];
} else {
dev_err(&pdev->dev, "sdma-params property not specified");
goto failed_sdma_init;
} |
while passing the parameters of sdma(channel No. and address of sdma script load address ) in devicetree the board is not booting(its booting till bootloader), is because of channel number and address?
| Devicetree |
|---|
&pwm3 {
comaptible = "glowforge,imx-pwm-audio";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm3>;
enable-gpio = <&gpio1 4 0>;
timer = <0x10>;
sdma-params = <0x19 0xdc0>;
status = "okay"; |
Please suggest me how to pass these parameters through devicetree and also give some examples to understand it.
Thanks & Regards
Ganesh K
