Support GPIO for one register control multiple pins case with calculating register offset first, then bit offset.
Signed-off-by: Jun Nie <[email protected]> --- drivers/pinctrl/pinctrl-single.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c index 13b45f2..4f23ef0 100644 --- a/drivers/pinctrl/pinctrl-single.c +++ b/drivers/pinctrl/pinctrl-single.c @@ -494,7 +494,7 @@ static int pcs_request_gpio(struct pinctrl_dev *pctldev, struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev); struct pcs_gpiofunc_range *frange = NULL; struct list_head *pos, *tmp; - int mux_bytes = 0; + int offset, mux_bytes = 0; unsigned data; /* If function mask is null, return directly. */ @@ -507,9 +507,23 @@ static int pcs_request_gpio(struct pinctrl_dev *pctldev, || pin < frange->offset) continue; mux_bytes = pcs->width / BITS_PER_BYTE; - data = pcs->read(pcs->base + pin * mux_bytes) & ~pcs->fmask; - data |= frange->gpiofunc; - pcs->write(data, pcs->base + pin * mux_bytes); + if (pcs->bits_per_mux) { + int pin_pos, byte_num, num_pins_in_register; + + num_pins_in_register = pcs->width / pcs->bits_per_pin; + byte_num = (pcs->bits_per_pin * pin) / BITS_PER_BYTE; + offset = (byte_num / mux_bytes) * mux_bytes; + pin_pos = pin % num_pins_in_register; + pin_pos *= pcs->bits_per_pin; + data = pcs->read(pcs->base + offset) & + ~(pcs->fmask << pin_pos); + data |= (frange->gpiofunc & pcs->fmask) << pin_pos; + } else { + offset = pin * mux_bytes; + data = pcs->read(pcs->base + offset) & ~pcs->fmask; + data |= frange->gpiofunc; + } + pcs->write(data, pcs->base + offset); break; } return 0; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
