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net: mvmdio: get and enable optional clock

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Marvell mdio driver uses internal registers that can be clock gated on
some SoCs. This patch just adds optional clock handling, to allow to pass
and enable the corresponding clock.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sebastian Hesselbarth 2013-04-07 01:09:47 +00:00 committed by David S. Miller
parent d5b40921aa
commit 3d604da1e9
1 changed files with 11 additions and 0 deletions
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11
drivers/net/ethernet/marvell/mvmdio.c
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@ -28,6 +28,7 @@
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/of_mdio.h>
#include <linux/sched.h>
#include <linux/wait.h>
@ -46,6 +47,7 @@
struct orion_mdio_dev {
struct mutex lock;
void __iomem *regs;
struct clk *clk;
/*
* If we have access to the error interrupt pin (which is
* somewhat misnamed as it not only reflects internal errors
@ -230,6 +232,10 @@ static int orion_mdio_probe(struct platform_device *pdev)
init_waitqueue_head(&dev->smi_busy_wait);
dev->clk = devm_clk_get(&pdev->dev, NULL);
if (!IS_ERR(dev->clk))
clk_prepare_enable(dev->clk);
dev->err_interrupt = platform_get_irq(pdev, 0);
if (dev->err_interrupt != -ENXIO) {
ret = devm_request_irq(&pdev->dev, dev->err_interrupt,
@ -258,6 +264,8 @@ static int orion_mdio_probe(struct platform_device *pdev)
return 0;
out_mdio:
if (!IS_ERR(dev->clk))
clk_disable_unprepare(dev->clk);
kfree(bus->irq);
mdiobus_free(bus);
return ret;
@ -272,6 +280,9 @@ static int orion_mdio_remove(struct platform_device *pdev)
mdiobus_unregister(bus);
kfree(bus->irq);
mdiobus_free(bus);
if (!IS_ERR(dev->clk))
clk_disable_unprepare(dev->clk);
return 0;
}