Qcom 8996 and later chips support prng v2 where we need to only
implement .read callback for hwrng.
Add a new table for v2 which supports this and get version required for
driver data.
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
---
drivers/char/hw_random/msm-rng.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/char/hw_random/msm-rng.c b/drivers/char/hw_random/msm-rng.c
index 7644474035e5..3f509072a6c6 100644
--- a/drivers/char/hw_random/msm-rng.c
+++ b/drivers/char/hw_random/msm-rng.c
@@ -17,6 +17,7 @@
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
/* Device specific register offsets */
@@ -132,10 +133,16 @@ static struct hwrng msm_rng = {
.read = msm_rng_read,
};
+static struct hwrng msm_rng_v2 = {
+ .name = KBUILD_MODNAME,
+ .read = msm_rng_read,
+};
+
static int msm_rng_probe(struct platform_device *pdev)
{
struct resource *res;
struct msm_rng *rng;
+ unsigned int version;
int ret;
rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
@@ -154,6 +161,9 @@ static int msm_rng_probe(struct platform_device *pdev)
return PTR_ERR(rng->clk);
rng->hwrng = &msm_rng;
+ version = (unsigned long)of_device_get_match_data(&pdev->dev);
+ if (version)
+ rng->hwrng = &msm_rng_v2;
rng->hwrng->priv = (unsigned long)rng;
ret = devm_hwrng_register(&pdev->dev, rng->hwrng);
@@ -166,7 +176,8 @@ static int msm_rng_probe(struct platform_device *pdev)
}
static const struct of_device_id msm_rng_of_match[] = {
- { .compatible = "qcom,prng", },
+ { .compatible = "qcom,prng", .data = (void *)0},
+ { .compatible = "qcom,prng-v2", .data = (void *)1},
{}
};
MODULE_DEVICE_TABLE(of, msm_rng_of_match);
--
2.14.4
