diff options
| -rw-r--r-- | Documentation/devicetree/bindings/net/stmmac.txt | 4 | ||||
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/stmmac.h | 2 | ||||
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 20 | ||||
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h | 2 |
4 files changed, 22 insertions, 6 deletions
diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt index 9b03c57563a..e45ac3f926b 100644 --- a/Documentation/devicetree/bindings/net/stmmac.txt +++ b/Documentation/devicetree/bindings/net/stmmac.txt @@ -39,6 +39,10 @@ Optional properties: further clocks may be specified in derived bindings. - clock-names: One name for each entry in the clocks property, the first one should be "stmmaceth". +- clk_ptp_ref: this is the PTP reference clock; in case of the PTP is + available this clock is used for programming the Timestamp Addend Register. + If not passed then the system clock will be used and this is fine on some + platforms. Examples: diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h index ca01035634a..128a0b723a0 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h @@ -105,6 +105,8 @@ struct stmmac_priv { struct ptp_clock *ptp_clock; struct ptp_clock_info ptp_clock_ops; unsigned int default_addend; + struct clk *clk_ptp_ref; + unsigned int clk_ptp_rate; u32 adv_ts; int use_riwt; int irq_wake; diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 51a89d4bb12..03652891fcb 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -603,16 +603,16 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr) /* calculate default added value: * formula is : * addend = (2^32)/freq_div_ratio; - * where, freq_div_ratio = STMMAC_SYSCLOCK/50MHz - * hence, addend = ((2^32) * 50MHz)/STMMAC_SYSCLOCK; - * NOTE: STMMAC_SYSCLOCK should be >= 50MHz to + * where, freq_div_ratio = clk_ptp_ref_i/50MHz + * hence, addend = ((2^32) * 50MHz)/clk_ptp_ref_i; + * NOTE: clk_ptp_ref_i should be >= 50MHz to * achive 20ns accuracy. * * 2^x * y == (y << x), hence * 2^32 * 50000000 ==> (50000000 << 32) */ temp = (u64) (50000000ULL << 32); - priv->default_addend = div_u64(temp, STMMAC_SYSCLOCK); + priv->default_addend = div_u64(temp, priv->clk_ptp_rate); priv->hw->ptp->config_addend(priv->ioaddr, priv->default_addend); @@ -638,6 +638,16 @@ static int stmmac_init_ptp(struct stmmac_priv *priv) if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp)) return -EOPNOTSUPP; + /* Fall-back to main clock in case of no PTP ref is passed */ + priv->clk_ptp_ref = devm_clk_get(priv->device, "clk_ptp_ref"); + if (IS_ERR(priv->clk_ptp_ref)) { + priv->clk_ptp_rate = clk_get_rate(priv->stmmac_clk); + priv->clk_ptp_ref = NULL; + } else { + clk_prepare_enable(priv->clk_ptp_ref); + priv->clk_ptp_rate = clk_get_rate(priv->clk_ptp_ref); + } + priv->adv_ts = 0; if (priv->dma_cap.atime_stamp && priv->extend_desc) priv->adv_ts = 1; @@ -657,6 +667,8 @@ static int stmmac_init_ptp(struct stmmac_priv *priv) static void stmmac_release_ptp(struct stmmac_priv *priv) { + if (priv->clk_ptp_ref) + clk_disable_unprepare(priv->clk_ptp_ref); stmmac_ptp_unregister(priv); } diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h index 3dbc047622f..4535df37c22 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h @@ -25,8 +25,6 @@ #ifndef __STMMAC_PTP_H__ #define __STMMAC_PTP_H__ -#define STMMAC_SYSCLOCK 62500000 - /* IEEE 1588 PTP register offsets */ #define PTP_TCR 0x0700 /* Timestamp Control Reg */ #define PTP_SSIR 0x0704 /* Sub-Second Increment Reg */ |