diff options
| author | Fugang Duan <B38611@freescale.com> | 2014-09-13 01:00:46 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-09-14 01:32:16 +0400 |
| commit | 9b5330edf1f8e24a8ca25412e6d341e0fae0ad0a (patch) | |
| tree | a3f807f854abf9409301a39b59f660b893b31e2d /drivers/net/ethernet/freescale | |
| parent | 42f272539487e49c9ea830ad97db41eb9937d5dc (diff) | |
| download | linux-9b5330edf1f8e24a8ca25412e6d341e0fae0ad0a.tar.xz | |
net:fec: add enet refrence clock for i.MX 6SX chip
i.MX6sx enet has below clocks for user config:
clk_ipg: ipg_clk_s, ipg_clk_mac0_s, 66Mhz
clk_ahb: enet system clock, it is enet AXI clock for imx6sx.
For imx6sx, it alos is the clock source of interrupt coalescing.
The clock range: 200Mhz ~ 266Mhz.
clk_ref: refrence clock for tx and rx. For imx6sx enet RGMII mode,
the refrence clock is 125Mhz coming from internal PLL or external.
In i.MX6sx-arm2 board, the clock is from internal PLL.
clk_ref is optional, depends on board.
clk_enet_out: The clock can be output from internal PLL. It can supply 50Mhz
clock for phy. clk_enet_out is optional, depends on chip and board.
clk_ptp: 1588 ts clock. It is optional, depends on chip.
The patch add clk_ref to distiguish the different clocks.
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Frank Li <Frank.Li@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/freescale')
| -rw-r--r-- | drivers/net/ethernet/freescale/fec.h | 1 | ||||
| -rw-r--r-- | drivers/net/ethernet/freescale/fec_main.c | 17 |
2 files changed, 18 insertions, 0 deletions
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h index ee41d98b44b6..635772bbfb73 100644 --- a/drivers/net/ethernet/freescale/fec.h +++ b/drivers/net/ethernet/freescale/fec.h @@ -272,6 +272,7 @@ struct fec_enet_private { struct clk *clk_ipg; struct clk *clk_ahb; + struct clk *clk_ref; struct clk *clk_enet_out; struct clk *clk_ptp; diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 89355a719625..c21ecff17608 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -1621,6 +1621,11 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable) } mutex_unlock(&fep->ptp_clk_mutex); } + if (fep->clk_ref) { + ret = clk_prepare_enable(fep->clk_ref); + if (ret) + goto failed_clk_ref; + } } else { clk_disable_unprepare(fep->clk_ahb); clk_disable_unprepare(fep->clk_ipg); @@ -1632,9 +1637,15 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable) fep->ptp_clk_on = false; mutex_unlock(&fep->ptp_clk_mutex); } + if (fep->clk_ref) + clk_disable_unprepare(fep->clk_ref); } return 0; + +failed_clk_ref: + if (fep->clk_ref) + clk_disable_unprepare(fep->clk_ref); failed_clk_ptp: if (fep->clk_enet_out) clk_disable_unprepare(fep->clk_enet_out); @@ -2637,6 +2648,12 @@ fec_probe(struct platform_device *pdev) fep->ptp_clk_on = false; mutex_init(&fep->ptp_clk_mutex); + + /* clk_ref is optional, depends on board */ + fep->clk_ref = devm_clk_get(&pdev->dev, "enet_clk_ref"); + if (IS_ERR(fep->clk_ref)) + fep->clk_ref = NULL; + fep->clk_ptp = devm_clk_get(&pdev->dev, "ptp"); fep->bufdesc_ex = pdev->id_entry->driver_data & FEC_QUIRK_HAS_BUFDESC_EX; |