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>

1 files changed, 17 insertions, 2 deletions

diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index 8744a556fbd1..a91859b133e8 100644
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -1221,12 +1221,25 @@ static struct nfc_digital_ops trf7970a_nfc_ops = {
         .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 @@ static int trf7970a_probe(struct spi_device *spi)
         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);