NFC: trf7970a: Add 'autosuspend-delay' DTS property
The trf7970a driver currently uses a fixed autosuspend delay of 30 seconds.
To enable users to customize the delay as they see fit, add support for the
new 'autosuspend-delay' DTS property (part of the nfc node) which can
override the default 30 seconds.
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index 8744a55..a91859b 100644
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -1221,12 +1221,25 @@
.abort_cmd = trf7970a_abort_cmd,
};
+static int trf7970a_get_autosuspend_delay(struct device_node *np)
+{
+ int autosuspend_delay, ret;
+
+ ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay);
+ if (ret)
+ autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY;
+
+ of_node_put(np);
+
+ return autosuspend_delay;
+}
+
static int trf7970a_probe(struct spi_device *spi)
{
struct device_node *np = spi->dev.of_node;
const struct spi_device_id *id = spi_get_device_id(spi);
struct trf7970a *trf;
- int uvolts, ret;
+ int uvolts, autosuspend_delay, ret;
if (!np) {
dev_err(&spi->dev, "No Device Tree entry\n");
@@ -1315,7 +1328,9 @@
nfc_digital_set_drvdata(trf->ddev, trf);
spi_set_drvdata(spi, trf);
- pm_runtime_set_autosuspend_delay(trf->dev, TRF7970A_AUTOSUSPEND_DELAY);
+ autosuspend_delay = trf7970a_get_autosuspend_delay(np);
+
+ pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay);
pm_runtime_use_autosuspend(trf->dev);
pm_runtime_enable(trf->dev);