hwrng: atmel - add DT support

Add DT support.

Make the driver depend on CONFIG_OF as at91sam9g45 was the only SoC making
use of the TRNG block and this SoC is now fully migrated to DT.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 8 insertions, 1 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index 91a04ae8003c..de57b38809c7 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -64,7 +64,7 @@ config HW_RANDOM_AMD
 
 config HW_RANDOM_ATMEL
         tristate "Atmel Random Number Generator support"
-        depends on ARCH_AT91 && HAVE_CLK
+        depends on ARCH_AT91 && HAVE_CLK && OF
         default HW_RANDOM
         ---help---
           This driver provides kernel-side support for the Random Number
diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
index 644ec4882206..0bb0b2120a63 100644
--- a/drivers/char/hw_random/atmel-rng.c
+++ b/drivers/char/hw_random/atmel-rng.c
@@ -123,6 +123,12 @@ static const struct dev_pm_ops atmel_trng_pm_ops = {
 };
 #endif /* CONFIG_PM */
 
+static const struct of_device_id atmel_trng_dt_ids[] = {
+        { .compatible = "atmel,at91sam9g45-trng" },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, atmel_trng_dt_ids);
+
 static struct platform_driver atmel_trng_driver = {
         .probe          = atmel_trng_probe,
         .remove         = atmel_trng_remove,
@@ -132,6 +138,7 @@ static struct platform_driver atmel_trng_driver = {
 #ifdef CONFIG_PM
                 .pm     = &atmel_trng_pm_ops,
 #endif /* CONFIG_PM */
+                .of_match_table = atmel_trng_dt_ids,
         },
 };