From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Wolfgang Grandegger <wg@grandegger.com>,
Marc Kleine-Budde <mkl@pengutronix.de>,
linux-can@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: [PATCH v1 1/3] can: mcp251x: Use devm_clk_get_optional() to get the input clock
Date: Mon, 26 Aug 2019 20:26:21 +0300 [thread overview]
Message-ID: <20190826172623.79378-1-andriy.shevchenko@linux.intel.com> (raw)
Simplify the code which fetches the input clock by using
devm_clk_get_optional(). This comes with a small functional change: previously
all errors were ignored when platform data is present. Now all errors are
treated as errors. If no input clock is present devm_clk_get_optional() will
return NULL instead of an error which matches the behavior of the old code.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/net/can/spi/mcp251x.c | 30 ++++++++++++------------------
1 file changed, 12 insertions(+), 18 deletions(-)
diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index 58992fd61cb9..e04b578f2b1f 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -1014,15 +1014,13 @@ static int mcp251x_can_probe(struct spi_device *spi)
struct clk *clk;
int freq, ret;
- clk = devm_clk_get(&spi->dev, NULL);
- if (IS_ERR(clk)) {
- if (pdata)
- freq = pdata->oscillator_frequency;
- else
- return PTR_ERR(clk);
- } else {
- freq = clk_get_rate(clk);
- }
+ clk = devm_clk_get_optional(&spi->dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ freq = clk_get_rate(clk);
+ if (freq == 0 && pdata)
+ freq = pdata->oscillator_frequency;
/* Sanity check */
if (freq < 1000000 || freq > 25000000)
@@ -1033,11 +1031,9 @@ static int mcp251x_can_probe(struct spi_device *spi)
if (!net)
return -ENOMEM;
- if (!IS_ERR(clk)) {
- ret = clk_prepare_enable(clk);
- if (ret)
- goto out_free;
- }
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ goto out_free;
net->netdev_ops = &mcp251x_netdev_ops;
net->flags |= IFF_ECHO;
@@ -1122,8 +1118,7 @@ static int mcp251x_can_probe(struct spi_device *spi)
mcp251x_power_enable(priv->power, 0);
out_clk:
- if (!IS_ERR(clk))
- clk_disable_unprepare(clk);
+ clk_disable_unprepare(clk);
out_free:
free_candev(net);
@@ -1141,8 +1136,7 @@ static int mcp251x_can_remove(struct spi_device *spi)
mcp251x_power_enable(priv->power, 0);
- if (!IS_ERR(priv->clk))
- clk_disable_unprepare(priv->clk);
+ clk_disable_unprepare(priv->clk);
free_candev(net);
--
2.23.0.rc1
next reply other threads:[~2019-08-26 17:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-26 17:26 Andy Shevchenko [this message]
2019-08-26 17:26 ` [PATCH v1 2/3] can: mcp251x: Make use of device property API Andy Shevchenko
2019-08-26 17:26 ` [PATCH v1 3/3] can: mcp251x: Call wrapper instead of regulator_disable() Andy Shevchenko
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