From: Hebbar Gururaja <gururaja.heb...@ti.com> 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 <gururaja.heb...@ti.com> Signed-off-by: Mugunthan V N <mugunthan...@ti.com> --- drivers/net/ethernet/ti/cpsw.c | 49 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 21a5b29..1150f06 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -35,6 +35,7 @@ #include <linux/if_vlan.h> #include <linux/platform_data/cpsw.h> +#include <linux/pinctrl/consumer.h> #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_default; + struct pinctrl_state *pins_sleep; }; #define napi_to_priv(napi) container_of(napi, struct cpsw_priv, napi) @@ -1689,6 +1695,36 @@ 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_default = pinctrl_lookup_state(priv->pinctrl, + PINCTRL_STATE_DEFAULT); + /* enable pins to be muxed in and configured */ + if (IS_ERR(priv->pins_default)) + dev_warn(&pdev->dev, "could not get default pinstate\n"); + else + if (pinctrl_select_state(priv->pinctrl, + priv->pins_default)) + 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_default = 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; @@ -1973,11 +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; } @@ -1985,8 +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_default)) + if (pinctrl_select_state(priv->pinctrl, priv->pins_default)) + dev_err(dev, "could not set default pins\n"); + if (netif_running(ndev)) cpsw_ndo_open(ndev); return 0; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html