On Tue, Jan 31, 2023 at 02:57:06PM -0800, Dmitry Torokhov wrote:
> Switch the driver from legacy gpio API that is deprecated to the newer
> gpiod API that respects line polarities described in ACPI/DT.
>
> This makes driver use standard property name for the reset gpio
> ("reset-gpios" vs "gpios-reset"), however there is a quirk in gpiolib
> to also recognize the legacy name and keep compatibility with older
> DTSes.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>
> ---
>
> All preparation gpiolib work to handle legacy names and polarity quirks
> has landed in mainline...
>
> drivers/video/backlight/hx8357.c | 82 ++++++++++++++------------------
> 1 file changed, 37 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/video/backlight/hx8357.c
> b/drivers/video/backlight/hx8357.c
> index 9b50bc96e00f..a93e14adb846 100644
> --- a/drivers/video/backlight/hx8357.c
> +++ b/drivers/video/backlight/hx8357.c
> [snip]
> - if (of_find_property(spi->dev.of_node, "im-gpios", NULL)) {
> - lcd->use_im_pins = 1;
> -
> - for (i = 0; i < HX8357_NUM_IM_PINS; i++) {
> - lcd->im_pins[i] = of_get_named_gpio(spi->dev.of_node,
> - "im-gpios", i);
> - if (lcd->im_pins[i] == -EPROBE_DEFER) {
> - dev_info(&spi->dev, "GPIO requested is not here
> yet, deferring the probe\n");
> - return -EPROBE_DEFER;
> - }
> - if (!gpio_is_valid(lcd->im_pins[i])) {
> - dev_err(&spi->dev, "Missing dt property:
> im-gpios\n");
> - return -EINVAL;
> + gpiod_set_consumer_name(lcd->reset, "hx8357-reset");
> +
> + for (i = 0; i < HX8357_NUM_IM_PINS; i++) {
> + lcd->im_pins[i] = devm_gpiod_get_index(&spi->dev,
> + "im", i, GPIOD_OUT_LOW);
> + ret = PTR_ERR_OR_ZERO(lcd->im_pins[i]);
> + if (ret) {
> + if (ret == -ENOENT) {
> + if (i == 0)
> + break;
> + dev_err(&spi->dev, "Missing im gpios[%d]\n", i);
> + ret = -EINVAL;
> + } if (ret == -EPROBE_DEFER) {
> + dev_info(&spi->dev, "im gpio[%d] is not here
> yet, deferring the probe\n",
> + i);
> + } else {
> + dev_err(&spi->dev, "failed to request im
> gpio[%d]: %d\n",
> + i, ret);
> }
These last two clauses should be updated to return dev_err_probe(...)
instead.
With that change:
Reviewed-by: Daniel Thompson <daniel.thomp...@linaro.org>
Daniel.
