[PATCH 0/3] hwrng: ks-sa - simple cleanups

[PATCH 0/3] hwrng: ks-sa - simple cleanups

[Martin Kaiser]

Some simple cleanups of the ks-sa-rng driver. Compile-tested only.

Martin Kaiser (3):
  hwrng: ks-sa - access private data via struct hwrng
  hwrng: ks-sa - remove dev from struct ks_sa_rng
  hwrng: ks-sa - use dev_err_probe

 drivers/char/hw_random/ks-sa-rng.c | 26 +++++++-------------------
 1 file changed, 7 insertions(+), 19 deletions(-)

-- 
2.39.2

[PATCH 1/3] hwrng: ks-sa - access private data via struct hwrng

[Martin Kaiser]

This driver uses a struct ks_sa_rng for its private data. It contains a
struct hwrng. Call container_of to get from hwrng to ks_sa_rng.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
---
 drivers/char/hw_random/ks-sa-rng.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/char/hw_random/ks-sa-rng.c b/drivers/char/hw_random/ks-sa-rng.c
index 2f2f21f1b659..0857964f8714 100644
--- a/drivers/char/hw_random/ks-sa-rng.c
+++ b/drivers/char/hw_random/ks-sa-rng.c
@@ -113,8 +113,7 @@ static unsigned int refill_delay_ns(unsigned long clk_rate)
 static int ks_sa_rng_init(struct hwrng *rng)
 {
 	u32 value;
-	struct device *dev = (struct device *)rng->priv;
-	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	struct ks_sa_rng *ks_sa_rng = container_of(rng, struct ks_sa_rng, rng);
 	unsigned long clk_rate = clk_get_rate(ks_sa_rng->clk);
 
 	/* Enable RNG module */
@@ -153,8 +152,7 @@ static int ks_sa_rng_init(struct hwrng *rng)
 
 static void ks_sa_rng_cleanup(struct hwrng *rng)
 {
-	struct device *dev = (struct device *)rng->priv;
-	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	struct ks_sa_rng *ks_sa_rng = container_of(rng, struct ks_sa_rng, rng);
 
 	/* Disable RNG */
 	writel(0, &ks_sa_rng->reg_rng->control);
@@ -164,8 +162,7 @@ static void ks_sa_rng_cleanup(struct hwrng *rng)
 
 static int ks_sa_rng_data_read(struct hwrng *rng, u32 *data)
 {
-	struct device *dev = (struct device *)rng->priv;
-	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	struct ks_sa_rng *ks_sa_rng = container_of(rng, struct ks_sa_rng, rng);
 
 	/* Read random data */
 	data[0] = readl(&ks_sa_rng->reg_rng->output_l);
@@ -179,8 +176,7 @@ static int ks_sa_rng_data_read(struct hwrng *rng, u32 *data)
 
 static int ks_sa_rng_data_present(struct hwrng *rng, int wait)
 {
-	struct device *dev = (struct device *)rng->priv;
-	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	struct ks_sa_rng *ks_sa_rng = container_of(rng, struct ks_sa_rng, rng);
 	u64 now = ktime_get_ns();
 
 	u32	ready;
@@ -225,7 +221,6 @@ static int ks_sa_rng_probe(struct platform_device *pdev)
 		.data_present = ks_sa_rng_data_present,
 		.cleanup = ks_sa_rng_cleanup,
 	};
-	ks_sa_rng->rng.priv = (unsigned long)dev;
 
 	ks_sa_rng->reg_rng = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(ks_sa_rng->reg_rng))
@@ -248,8 +243,6 @@ static int ks_sa_rng_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, ks_sa_rng);
-
 	return devm_hwrng_register(&pdev->dev, &ks_sa_rng->rng);
 }
 
-- 
2.39.2

[PATCH 2/3] hwrng: ks-sa - remove dev from struct ks_sa_rng

[Martin Kaiser]

dev in struct ks_sa_rng is not used. Remove it.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
---
 drivers/char/hw_random/ks-sa-rng.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/char/hw_random/ks-sa-rng.c b/drivers/char/hw_random/ks-sa-rng.c
index 0857964f8714..70d21bf657ce 100644
--- a/drivers/char/hw_random/ks-sa-rng.c
+++ b/drivers/char/hw_random/ks-sa-rng.c
@@ -81,7 +81,6 @@ struct trng_regs {
 };
 
 struct ks_sa_rng {
-	struct device	*dev;
 	struct hwrng	rng;
 	struct clk	*clk;
 	struct regmap	*regmap_cfg;
@@ -213,7 +212,6 @@ static int ks_sa_rng_probe(struct platform_device *pdev)
 	if (!ks_sa_rng)
 		return -ENOMEM;
 
-	ks_sa_rng->dev = dev;
 	ks_sa_rng->rng = (struct hwrng) {
 		.name = "ks_sa_hwrng",
 		.init = ks_sa_rng_init,
-- 
2.39.2

[PATCH 3/3] hwrng: ks-sa - use dev_err_probe

[Martin Kaiser]

Replace dev_err + return with dev_err_probe.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
---
 drivers/char/hw_random/ks-sa-rng.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/char/hw_random/ks-sa-rng.c b/drivers/char/hw_random/ks-sa-rng.c
index 70d21bf657ce..dff7b9db7044 100644
--- a/drivers/char/hw_random/ks-sa-rng.c
+++ b/drivers/char/hw_random/ks-sa-rng.c
@@ -228,17 +228,14 @@ static int ks_sa_rng_probe(struct platform_device *pdev)
 		syscon_regmap_lookup_by_phandle(dev->of_node,
 						"ti,syscon-sa-cfg");
 
-	if (IS_ERR(ks_sa_rng->regmap_cfg)) {
-		dev_err(dev, "syscon_node_to_regmap failed\n");
-		return -EINVAL;
-	}
+	if (IS_ERR(ks_sa_rng->regmap_cfg))
+		return dev_err_probe(dev, -EINVAL, "syscon_node_to_regmap failed\n");
 
 	pm_runtime_enable(dev);
 	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0) {
-		dev_err(dev, "Failed to enable SA power-domain\n");
 		pm_runtime_disable(dev);
-		return ret;
+		return dev_err_probe(dev, ret, "Failed to enable SA power-domain\n");
 	}
 
 	return devm_hwrng_register(&pdev->dev, &ks_sa_rng->rng);
-- 
2.39.2

Re: [PATCH 0/3] hwrng: ks-sa - simple cleanups

[Herbert Xu]

On Thu, Aug 24, 2023 at 09:40:34PM +0200, Martin Kaiser wrote:
> Some simple cleanups of the ks-sa-rng driver. Compile-tested only.
> 
> Martin Kaiser (3):
>   hwrng: ks-sa - access private data via struct hwrng
>   hwrng: ks-sa - remove dev from struct ks_sa_rng
>   hwrng: ks-sa - use dev_err_probe
> 
>  drivers/char/hw_random/ks-sa-rng.c | 26 +++++++-------------------
>  1 file changed, 7 insertions(+), 19 deletions(-)
> 
> -- 
> 2.39.2

All applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt