From: Andrew Bresticker Date: Tue, 7 Apr 2015 20:38:45 +0000 (-0700) Subject: stmmac: Add an optional register interface clock X-Git-Tag: v4.1-rc1~128^2~48 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=5f9755d26fbfcb6787a6746653f1760fef0d5ba5;p=linux.git 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: Andrew Bresticker Cc: James Hartley Cc: Arnd Bergmann Signed-off-by: David S. Miller --- diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt index 8ca65cec52ae..29aca8591b16 100644 --- a/Documentation/devicetree/bindings/net/stmmac.txt +++ b/Documentation/devicetree/bindings/net/stmmac.txt @@ -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 diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h index c0a391983372..2ac9552d1fa3 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h @@ -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; diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 5336594abed1..06103cad7c77 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -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);