Generate audio with pwm (IMX6UL)

ganesh_k — Thu, 19 Jul 2018 11:02:50 GMT

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; }

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

Re: Generate audio with pwm (IMX6UL)

BiyongSUN — Tue, 17 Aug 2021 09:32:12 GMT

maybe you can check the Medium Quality Sound (MQS) of i.MX6UL to see if meet your requirements.

topic Generate audio with pwm (IMX6UL) in i.MX Processors

Generate audio with pwm (IMX6UL)

Re: Generate audio with pwm (IMX6UL)