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SPI gpio expander with mcp23s08

In this application mcp23s08 is used to expand imx23 gpio’s with GPIO 97,98, …104. SPI slave select is connected on mcp23s08’s address pin A0 so chip select is done when A0 is low. Device tree file is modified as follow: ssp1: ssp@80034000 { #address-cells = ; #size-cells = ; compatible = “fsl,imx23-spi”; pinctrl-names = “default”;

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formats

SPI – Serial Periferial Interface

The i.MX23 has two identical synchronous serial ports (SSP). The SSP supports four modes of operation’s: Motorola SPI, Windbond SPI, Texas Instruments SSI and SD/SDIO/MMC (1-bit, 4-bit, and 8-bit) mode. Mode of operation is determined with SSP1 control register’s at address space beginning at 0x8001_0000 and SSP2 beginning at 0x8003_4000. The SSP also supports slave

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