Imx233 spi speed - Mainline Kernel

[pierreparent]

Hi,

I don't succeed in configuring SPI Hz-Speed with mailine kernel (4.0.3).

Here is my dts:

		ssp1: ssp@80034000 {
			#address-cells = <1>;
			#size-cells = <0>;
			compatible = "fsl,imx23-spi";
			pinctrl-names = "default";
			pinctrl-0 = <&spi2_pins_a>;
			status = "okay";
			clock-frequency = <5000000>;

			spidev: spidev@0 {
					compatible = "spidev";
				spi-max-frequency = <5000000>;
				reg = <0>;
				};

};

But whatever I tried the spi_clock remains at 1mhz!

Does anyone know how to solve this problem?

Thanks in advance,

Pierre.

[b36401]

You can change fuses for SSP clock according to table 7-53 "HW_OCOTP_ROM0" of i.MX23 Reference Manual.

11:8  - SSP_SCK_INDEX Index to SSP clock speed.

0000 = 240kHz

0010 = 1MHz           0011 = 2MHz

0100 = 4 MHz          0101 = 6MHz

0110 = 8MHz           0111 = 10MHz

1000 = 12MHz        1001 = 16MHz

1010 = 20MHz        1011 = 24MHz

1100 = 40MHz        1101 = 48MHz

1110 = 240kHz

Have a great day,

Victor

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[pierreparent]

I think it comes form the function void mxs_ssp_set_clk_rate(struct mxs_ssp *ssp, unsigned int rate) in file  clk-ssp.c which should change clock speed but does not work, I don't know why yet.