From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Florian Fainelli <f.fainelli@gmail.com>,
Matt Mackall <mpm@selenic.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>, Ray Jui <rjui@broadcom.com>,
Scott Branden <sbranden@broadcom.com>,
bcm-kernel-feedback-list@broadcom.com (maintainer:BROADCOM
BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE...),
Eric Anholt <eric@anholt.net>,
Stefan Wahren <stefan.wahren@i2se.com>,
PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>,
Russell King <rmk+kernel@armlinux.org.uk>,
Krzysztof Kozlowski <krzk@kernel.org>,
Harald Freudenberger <freude@linux.vnet.ibm.com>,
Sean Wang <sean.wang@mediatek.com>,
Martin Kaiser <martin@kaiser.cx>,
Steffen Trumtrar <s.trumtrar@pengutronix.de>,
linux-crypto@vger.kernel.org (open list:HARDWARE RANDOM NUMBER
GENERATOR CORE),
devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND
FLATTENED DEVICE TREE BINDINGS),
linux-rpi-kernel@lists.infradead.org (moderated list:BROADCOM
BCM2835 ARM ARCHITECTURE),
linux-arm-kernel@lists.infradead.org (moderated list:BROADCOM
BCM2835 ARM ARCHITECTURE)
Subject: [PATCH 07/12] hwrng: bcm2835-rng: Manage an optional clock
Date: Wed, 1 Nov 2017 18:04:03 -0700 [thread overview]
Message-ID: <20171102010408.27736-8-f.fainelli@gmail.com> (raw)
In-Reply-To: <20171102010408.27736-1-f.fainelli@gmail.com>
One of the last steps before bcm63xx-rng can be eliminated is to manage
a clock during hwrng::init and hwrng::cleanup, so fetch it in the probe
function, and manage it during these two steps when valid.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/char/hw_random/bcm2835-rng.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
index ed20e0b6b7ae..35928efb52e7 100644
--- a/drivers/char/hw_random/bcm2835-rng.c
+++ b/drivers/char/hw_random/bcm2835-rng.c
@@ -15,6 +15,7 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/printk.h>
+#include <linux/clk.h>
#define RNG_CTRL 0x0
#define RNG_STATUS 0x4
@@ -33,6 +34,7 @@ struct bcm2835_rng_priv {
struct hwrng rng;
void __iomem *base;
bool mask_interrupts;
+ struct clk *clk;
};
static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng)
@@ -67,6 +69,11 @@ static int bcm2835_rng_init(struct hwrng *rng)
{
struct bcm2835_rng_priv *priv = to_rng_priv(rng);
u32 val;
+ int ret;
+
+ ret = clk_prepare_enable(priv->clk);
+ if (ret)
+ return ret;
if (priv->mask_interrupts) {
/* mask the interrupt */
@@ -88,6 +95,8 @@ static void bcm2835_rng_cleanup(struct hwrng *rng)
/* disable rng hardware */
__raw_writel(0, priv->base + RNG_CTRL);
+
+ clk_disable_unprepare(priv->clk);
}
struct bcm2835_rng_of_data {
@@ -130,6 +139,11 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
return PTR_ERR(priv->base);
}
+ /* Clock is optional on most platforms */
+ priv->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->clk))
+ priv->clk = NULL;
+
priv->rng.name = "bcm2835-rng";
priv->rng.init = bcm2835_rng_init;
priv->rng.read = bcm2835_rng_read;
--
2.9.3
next prev parent reply other threads:[~2017-11-02 1:06 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-02 1:03 [PATCH 00/12] bcm63xx-rng conversion to bcm2835-rng Florian Fainelli
2017-11-02 1:03 ` [PATCH 01/12] hwrng: bcm2835-rng: Obtain base register via resource Florian Fainelli
2017-11-02 1:03 ` [PATCH 02/12] hwrng: bcm2835-rng: Define a driver private context Florian Fainelli
2017-11-02 1:03 ` [PATCH 03/12] hwrng: bcm2835-rng: Move enabling to hwrng::init Florian Fainelli
2017-11-02 1:04 ` [PATCH 04/12] hwrng: bcm2835-rng: Implementation cleanup callback Florian Fainelli
2017-11-02 1:04 ` [PATCH 05/12] hwrng: bcm2835-rng: Use device managed helpers Florian Fainelli
2017-11-02 1:04 ` [PATCH 06/12] hwrng: bcm2835-rng: Rework interrupt masking Florian Fainelli
2017-11-02 1:04 ` Florian Fainelli [this message]
2017-11-04 13:50 ` [PATCH 07/12] hwrng: bcm2835-rng: Manage an optional clock Stefan Wahren
2017-11-04 17:59 ` Florian Fainelli
2017-11-04 18:22 ` Stefan Wahren
2017-11-04 19:37 ` Andrew Lunn
2017-11-04 20:08 ` Russell King - ARM Linux
2017-11-04 20:17 ` Andrew Lunn
2017-11-02 1:04 ` [PATCH 08/12] hwrng: bcm2835-rng: Abstract I/O accessors Florian Fainelli
2017-11-03 20:19 ` Eric Anholt
2017-11-03 22:04 ` Florian Fainelli
2017-11-02 1:04 ` [PATCH 09/12] hwrng: bcm2835-rng: Add Broadcom MIPS " Florian Fainelli
2017-11-02 1:04 ` [PATCH 10/12] dt-bindings: rng: Incorporate brcm,bcm6368.txt binding Florian Fainelli
2017-11-06 21:38 ` Rob Herring
2017-11-02 1:04 ` [PATCH 11/12] hwrng: bcm2835-rng: Enable BCM2835 RNG to work on BCM63xx platforms Florian Fainelli
2017-11-04 18:27 ` Stefan Wahren
2017-11-06 20:16 ` Florian Fainelli
2017-11-07 6:45 ` Stefan Wahren
2017-11-07 23:27 ` Stefan Wahren
2017-11-02 1:04 ` [PATCH 12/12] hwrng: bcm63xx-rng: Remove since bcm2835-rng takes over Florian Fainelli
2017-11-03 20:18 ` Eric Anholt
2017-11-03 21:58 ` Florian Fainelli
2017-11-02 19:00 ` [PATCH 00/12] bcm63xx-rng conversion to bcm2835-rng Stefan Wahren
2017-11-02 19:01 ` Stefan Wahren
2017-11-02 19:06 ` Florian Fainelli
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