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stmmac: Add an optional register interface clock

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The DWMAC block on certain SoCs (such as IMG Pistachio) have a second
clock which must be enabled in order to access the peripheral's
register interface, so add support for requesting and enabling an
optional "pclk".

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Cc: James Hartley <james.hartley@imgtec.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Bresticker 2015-04-07 13:38:45 -07:00 committed by David S. Miller
parent 2790460e14
commit 5f9755d26f
3 changed files with 20 additions and 3 deletions
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7
Documentation/devicetree/bindings/net/stmmac.txt
View File

@ -35,10 +35,11 @@ Optional properties:
- reset-names: Should contain the reset signal name "stmmaceth", if a
reset phandle is given
- max-frame-size: See ethernet.txt file in the same directory
- clocks: If present, the first clock should be the GMAC main clock,
further clocks may be specified in derived bindings.
- clocks: If present, the first clock should be the GMAC main clock and
the second clock should be peripheral's register interface clock. 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".
first one should be "stmmaceth" and the second one should be "pclk".
- 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

1
drivers/net/ethernet/stmicro/stmmac/stmmac.h
View File

@ -97,6 +97,7 @@ struct stmmac_priv {
int wolopts;
int wol_irq;
struct clk *stmmac_clk;
struct clk *pclk;
struct reset_control *stmmac_rst;
int clk_csr;
struct timer_list eee_ctrl_timer;

15
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -2849,6 +2849,16 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
}
clk_prepare_enable(priv->stmmac_clk);
priv->pclk = devm_clk_get(priv->device, "pclk");
if (IS_ERR(priv->pclk)) {
if (PTR_ERR(priv->pclk) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto error_pclk_get;
}
priv->pclk = NULL;
}
clk_prepare_enable(priv->pclk);
priv->stmmac_rst = devm_reset_control_get(priv->device,
STMMAC_RESOURCE_NAME);
if (IS_ERR(priv->stmmac_rst)) {
@ -2934,6 +2944,8 @@ error_mdio_register:
error_netdev_register:
netif_napi_del(&priv->napi);
error_hw_init:
clk_disable_unprepare(priv->pclk);
error_pclk_get:
clk_disable_unprepare(priv->stmmac_clk);
error_clk_get:
free_netdev(ndev);
@ -2965,6 +2977,7 @@ int stmmac_dvr_remove(struct net_device *ndev)
unregister_netdev(ndev);
if (priv->stmmac_rst)
reset_control_assert(priv->stmmac_rst);
clk_disable_unprepare(priv->pclk);
clk_disable_unprepare(priv->stmmac_clk);
free_netdev(ndev);
@ -3011,6 +3024,7 @@ int stmmac_suspend(struct net_device *ndev)
stmmac_set_mac(priv->ioaddr, false);
pinctrl_pm_select_sleep_state(priv->device);
/* Disable clock in case of PWM is off */
clk_disable(priv->pclk);
clk_disable(priv->stmmac_clk);
}
spin_unlock_irqrestore(&priv->lock, flags);
@ -3051,6 +3065,7 @@ int stmmac_resume(struct net_device *ndev)
pinctrl_pm_select_default_state(priv->device);
/* enable the clk prevously disabled */
clk_enable(priv->stmmac_clk);
clk_enable(priv->pclk);
/* reset the phy so that it's ready */
if (priv->mii)
stmmac_mdio_reset(priv->mii);