Commit ce69b95c authored by Guan Ben's avatar Guan Ben Committed by Samuel Ortiz

NFC: Make EN2 pin optional in the TRF7970A driver

Make the EN2 pin optional. This is useful for boards,
which have this pin fix wired, for example to ground.
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarGuan Ben <ben.guan@cn.bosch.com>
Signed-off-by: default avatarMark Jonas <mark.jonas@de.bosch.com>
Signed-off-by: default avatarHeiko Schocher <hs@denx.de>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 96bd0b5e
......@@ -5,8 +5,8 @@ Required properties:
- spi-max-frequency: Maximum SPI frequency (<= 2000000).
- interrupt-parent: phandle of parent interrupt handler.
- interrupts: A single interrupt specifier.
- ti,enable-gpios: Two GPIO entries used for 'EN' and 'EN2' pins on the
TRF7970A.
- ti,enable-gpios: One or two GPIO entries used for 'EN' and 'EN2' pins on the
TRF7970A. EN2 is optional.
- vin-supply: Regulator for supply voltage to VIN pin
Optional SoC Specific Properties:
......
......@@ -1885,9 +1885,11 @@ static int trf7970a_power_up(struct trf7970a *trf)
usleep_range(5000, 6000);
if (!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) {
if (gpio_is_valid(trf->en2_gpio)) {
gpio_set_value(trf->en2_gpio, 1);
usleep_range(1000, 2000);
}
}
gpio_set_value(trf->en_gpio, 1);
......@@ -1914,6 +1916,7 @@ static int trf7970a_power_down(struct trf7970a *trf)
}
gpio_set_value(trf->en_gpio, 0);
if (gpio_is_valid(trf->en2_gpio))
gpio_set_value(trf->en2_gpio, 0);
ret = regulator_disable(trf->regulator);
......@@ -2032,16 +2035,15 @@ static int trf7970a_probe(struct spi_device *spi)
trf->en2_gpio = of_get_named_gpio(np, "ti,enable-gpios", 1);
if (!gpio_is_valid(trf->en2_gpio)) {
dev_err(trf->dev, "No EN2 GPIO property\n");
return trf->en2_gpio;
}
dev_info(trf->dev, "No EN2 GPIO property\n");
} else {
ret = devm_gpio_request_one(trf->dev, trf->en2_gpio,
GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN2");
if (ret) {
dev_err(trf->dev, "Can't request EN2 GPIO: %d\n", ret);
return ret;
}
}
if (of_property_read_bool(np, "en2-rf-quirk"))
trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW;
......
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