On 12/05/2012 11:48 PM, Grant Likely wrote: >> - base = REG_GPIODATAIN1 + d_bnk; >> + direction = gpio_twl4030_read(REG_GPIODATADIR1 + d_bnk); >> + if (direction > 0 && (direction >> d_off) & 0x1) >> + base = REG_SETGPIODATAOUT1 + d_bnk; >> + else >> + base = REG_GPIODATAIN1 + d_bnk; >> + > > This is probably quite expensive considering that reads need to go out > the i2c bus. Things like the output state and the pin direction should > be cached by the driver in its private data structure so that you don't > add an additional i2c round trip.
True. I have sent the v2, which grown a bit since I did not wanted to add more global variable to this driver. -- Péter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
