Is there a plan for providing a way to set pdata for an I2C chip in a way that could be shared across all OF platforms?
For example, the pca953x I2C GPIO driver requires that pdata != NULL so it can get the gpio_base field. It can also take in a default 'invert' value to initialize a chip register with. Currently, there's no obvious way to get this to work on PowerPC without hardcoding things in the arch/powerpc/platforms/*.c file. On ARM platforms, they currently handle this by declaring I2C_BOARD_INFO() in their board-specific files. For OF platforms, I think the obvious choice would be to specify platform data in the device tree. We already register I2C devices automatically as found in the device tree (see drivers/of/of_i2c.c), but this registration method does not provide any way to set platform_data. Of course, I could put some code in my board specific file to parse the device tree properties and set pdata accordingly, but this hardly seems ideal. After all, the device tree bindings -> pdata translation itself does not have to be board-specific. Basically, I think we need to have some common code somewhere that does the task of populating platform_data for a specific I2C chip based on a device tree node -- similarly to how we register the I2C devices already. Is anyone working on this? Did anyone have anything else in mind? -- Nate Case <[EMAIL PROTECTED]> _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
