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Commit 5f9755d2 authored by Andrew Bresticker's avatar Andrew Bresticker Committed by David S. Miller
Browse files

stmmac: Add an optional register interface clock 



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: default avatarAndrew Bresticker <abrestic@chromium.org>
Cc: James Hartley <james.hartley@imgtec.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2790460e

Documentation/devicetree/bindings/net/stmmac.txt

+4 −3
Original line number Diff line number Diff line
@@ -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

drivers/net/ethernet/stmicro/stmmac/stmmac.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

+15 −0
Original line number Diff line number Diff line
@@ -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 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device, 
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);