From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mugunthan V N Subject: [net-next PATCH v4 1/5] net: cpsw: enhance pinctrl support Date: Wed, 5 Jun 2013 22:38:15 +0530 Message-ID: <1370452099-24026-2-git-send-email-mugunthanvnm@ti.com> References: <1370452099-24026-1-git-send-email-mugunthanvnm@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from arroyo.ext.ti.com ([192.94.94.40]:55152 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756432Ab3FERHn (ORCPT ); Wed, 5 Jun 2013 13:07:43 -0400 In-Reply-To: <1370452099-24026-1-git-send-email-mugunthanvnm@ti.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: netdev@vger.kernel.org Cc: davem@davemloft.net, devicetree-discuss@lists.ozlabs.org, linux-omap@vger.kernel.org, benoit.cousson@linaro.org, paul@pwsan.com, Hebbar Gururaja , Mugunthan V N From: Hebbar Gururaja Amend cpsw controller to optionally take a pin control handle and set the state of the pins to: - "default" on boot, resume - "sleep" on suspend() This should make it possible to optimize energy usage for the pins for the suspend/resume cycle. If any of the above pin states are missing in dt, a warning message about the missing state is displayed. If certain pin-states are not available, to remove this warning message pass respective state name with null phandler. Signed-off-by: Hebbar Gururaja Signed-off-by: Mugunthan V N --- drivers/net/ethernet/ti/cpsw.c | 48 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index a45f64e..0599515 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -35,6 +35,7 @@ #include #include +#include #include "cpsw_ale.h" #include "cpts.h" @@ -351,6 +352,11 @@ struct cpsw_priv { bool irq_enabled; struct cpts *cpts; u32 emac_port; + + /* Two optional pin states - default & sleep */ + struct pinctrl *pinctrl; + struct pinctrl_state *pins_def; + struct pinctrl_state *pins_sleep; }; #define napi_to_priv(napi) container_of(napi, struct cpsw_priv, napi) @@ -1691,6 +1697,35 @@ static int cpsw_probe(struct platform_device *pdev) */ pm_runtime_enable(&pdev->dev); + priv->pinctrl = devm_pinctrl_get(&pdev->dev); + if (!IS_ERR(priv->pinctrl)) { + priv->pins_def = pinctrl_lookup_state(priv->pinctrl, + PINCTRL_STATE_DEFAULT); + /* enable pins to be muxed in and configured */ + if (IS_ERR(priv->pins_def)) + dev_warn(&pdev->dev, "could not get default pinstate\n"); + else + if (pinctrl_select_state(priv->pinctrl, + priv->pins_def)) + dev_err(&pdev->dev, + "could not set default pins\n"); + + priv->pins_sleep = pinctrl_lookup_state(priv->pinctrl, + PINCTRL_STATE_SLEEP); + if (IS_ERR(priv->pins_sleep)) + dev_warn(&pdev->dev, "could not get sleep pinstate\n"); + } else { + /* Since we continue even when pinctrl node is not found, + * Invalidate pins as not available. This is to make sure that + * IS_ERR(pins_xxx) results in failure when used. + */ + priv->pins_def = ERR_PTR(-ENODATA); + priv->pins_sleep = ERR_PTR(-ENODATA); + + dev_warn(&pdev->dev, + "pins are not configured from the driver\n"); + } + if (cpsw_probe_dt(&priv->data, pdev)) { pr_err("cpsw: platform data missing\n"); ret = -ENODEV; @@ -1974,11 +2009,17 @@ static int cpsw_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct net_device *ndev = platform_get_drvdata(pdev); + struct cpsw_priv *priv = netdev_priv(ndev); if (netif_running(ndev)) cpsw_ndo_stop(ndev); pm_runtime_put_sync(&pdev->dev); + /* Optionally let pins go into sleep states */ + if (!IS_ERR(priv->pins_sleep)) + if (pinctrl_select_state(priv->pinctrl, priv->pins_sleep)) + dev_err(dev, "could not set pins to sleep state\n"); + return 0; } @@ -1986,8 +2027,15 @@ static int cpsw_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct net_device *ndev = platform_get_drvdata(pdev); + struct cpsw_priv *priv = netdev_priv(ndev); pm_runtime_get_sync(&pdev->dev); + + /* Optionaly enable pins to be muxed in and configured */ + if (!IS_ERR(priv->pins_def)) + if (pinctrl_select_state(priv->pinctrl, priv->pins_def)) + dev_err(dev, "could not set default pins\n"); + if (netif_running(ndev)) cpsw_ndo_open(ndev); return 0; -- 1.7.9.5