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 (file)
--- 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);