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fs_enet: cleanup clock API use 

make the Freescale ethernet driver get, prepare and enable the FEC clock
during probe(); disable and unprepare the clock upon remove(), put is
done by the devm approach; hold a reference to the clock over the period
of use.

clock lookup is non-fatal as not all platforms provide clock specs in
their device tree; failure to enable specified clocks is fatal.

Signed-off-by: Gerhard Sittig <gsi@denx.de>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerhard Sittig 2013-08-22 21:55:13 +02:00 committed by David S. Miller
parent 35b9eb0eee
commit 2771399ac9
2 changed files with 23 additions and 0 deletions
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20
drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
View File

@ -999,6 +999,8 @@ static int fs_enet_probe(struct platform_device *ofdev)
struct fs_enet_private *fep;
struct fs_platform_info *fpi;
const u32 *data;
struct clk *clk;
int err;
const u8 *mac_addr;
const char *phy_connection_type;
int privsize, len, ret = -ENODEV;
@ -1036,6 +1038,20 @@ static int fs_enet_probe(struct platform_device *ofdev)
fpi->use_rmii = 1;
}
/* make clock lookup non-fatal (the driver is shared among platforms),
* but require enable to succeed when a clock was specified/found,
* keep a reference to the clock upon successful acquisition
*/
clk = devm_clk_get(&ofdev->dev, "per");
if (!IS_ERR(clk)) {
err = clk_prepare_enable(clk);
if (err) {
ret = err;
goto out_free_fpi;
}
fpi->clk_per = clk;
}
privsize = sizeof(*fep) +
sizeof(struct sk_buff **) *
(fpi->rx_ring + fpi->tx_ring);
@ -1107,6 +1123,8 @@ out_free_dev:
free_netdev(ndev);
out_put:
of_node_put(fpi->phy_node);
if (fpi->clk_per)
clk_disable_unprepare(fpi->clk_per);
out_free_fpi:
kfree(fpi);
return ret;
@ -1123,6 +1141,8 @@ static int fs_enet_remove(struct platform_device *ofdev)
fep->ops->cleanup_data(ndev);
dev_set_drvdata(fep->dev, NULL);
of_node_put(fep->fpi->phy_node);
if (fep->fpi->clk_per)
clk_disable_unprepare(fep->fpi->clk_per);
free_netdev(ndev);
return 0;
}

3
include/linux/fs_enet_pd.h
View File

@ -16,6 +16,7 @@
#ifndef FS_ENET_PD_H
#define FS_ENET_PD_H
#include <linux/clk.h>
#include <linux/string.h>
#include <linux/of_mdio.h>
#include <linux/if_ether.h>
@ -143,6 +144,8 @@ struct fs_platform_info {
int use_rmii; /* use RMII mode */
int has_phy; /* if the network is phy container as well...*/
struct clk *clk_per; /* 'per' clock for register access */
};
struct fs_mii_fec_platform_info {
u32 irq[32];