i.MX6 is access to ECSPI pins as GPIO possible?

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i.MX6 is access to ECSPI pins as GPIO possible?

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J_W
Contributor III

I have a device that needs to put into SPI mode by the following procedure:

 - Poll CSPI_ready
 - When CSPI_ready goes high enable SS
 - Send at least 16 clock cycles

I have my device hooked up against the standard configuration:

pinctrl_ecspi1: ecspi1grp {
		fsl,pins = <
			MX6QDL_PAD_EIM_D18__ECSPI1_MOSI		0x0b0b0
			MX6QDL_PAD_EIM_D17__ECSPI1_MISO		0x0b0b0
			MX6QDL_PAD_EIM_D16__ECSPI1_SCLK		0x0b0b0
			MX6QDL_PAD_GPIO_19__ECSPI1_RDY		0x0b0b0
			MX6QDL_PAD_EIM_EB2__GPIO2_IO30		0x0b0b0 /* SPI CS0 */
			MX6QDL_PAD_EIM_D19__GPIO3_IO19		0x0b0b0 /* SPI CS1 */
		>;
	};

 

I want to poll the CSPI_Ready line and then just send some garbage data when it goes high. 

This doesn't seem to be a possibility with the regular spider.h provided functions - to which I am able to find examples. I have CONFIG_SPI_IMX enabled in my Linux config but I am unable to find any examples what-so-ever on how to make use of these functions. I've tried reading through the source code but I can't make sense of it.

1. Is there any example of ANYTHING with this out there? Even the most trivial example would go a long way in helping me, I believe.

2. Is it possible to poll the CSPI_Ready pin while not transferring any data?

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