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: Mugunthan V N <mugunthan...@ti.com> --- drivers/net/ethernet/ti/davinci_mdio.c | 46 ++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c index 12aec17..0026006 100644 --- a/drivers/net/ethernet/ti/davinci_mdio.c +++ b/drivers/net/ethernet/ti/davinci_mdio.c @@ -38,6 +38,7 @@ #include <linux/davinci_emac.h> #include <linux/of.h> #include <linux/of_device.h> +#include <linux/pinctrl/consumer.h> /* * This timeout definition is a worst-case ultra defensive measure against @@ -94,6 +95,11 @@ struct davinci_mdio_data { struct mii_bus *bus; bool suspended; unsigned long access_time; /* jiffies */ + + /* Two optional pin states - default & sleep */ + struct pinctrl *pinctrl; + struct pinctrl_state *pins_default; + struct pinctrl_state *pins_sleep; }; static void __davinci_mdio_reset(struct davinci_mdio_data *data) @@ -347,6 +353,36 @@ static int davinci_mdio_probe(struct platform_device *pdev) data->bus->parent = dev; data->bus->priv = data; + data->pinctrl = devm_pinctrl_get(&pdev->dev); + if (!IS_ERR(data->pinctrl)) { + data->pins_default = pinctrl_lookup_state(data->pinctrl, + PINCTRL_STATE_DEFAULT); + /* enable pins to be muxed in and configured */ + if (IS_ERR(data->pins_default)) + dev_warn(&pdev->dev, "could not get default pinstate\n"); + else + if (pinctrl_select_state(data->pinctrl, + data->pins_default)) + dev_err(&pdev->dev, + "could not set default pins\n"); + + data->pins_sleep = pinctrl_lookup_state(data->pinctrl, + PINCTRL_STATE_SLEEP); + if (IS_ERR(data->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. + */ + data->pins_default = ERR_PTR(-ENODATA); + data->pins_sleep = ERR_PTR(-ENODATA); + + dev_warn(&pdev->dev, + "pins are not configured from the driver\n"); + } + pm_runtime_enable(&pdev->dev); pm_runtime_get_sync(&pdev->dev); data->clk = clk_get(&pdev->dev, "fck"); @@ -454,6 +490,11 @@ static int davinci_mdio_suspend(struct device *dev) data->suspended = true; spin_unlock(&data->lock); + /* Optionally let pins go into sleep states */ + if (!IS_ERR(data->pins_sleep)) + if (pinctrl_select_state(data->pinctrl, data->pins_sleep)) + dev_err(dev, "could not set pins to sleep state\n"); + return 0; } @@ -465,6 +506,11 @@ static int davinci_mdio_resume(struct device *dev) spin_lock(&data->lock); pm_runtime_get_sync(data->dev); + /* Optionaly enable pins to be muxed in and configured */ + if (!IS_ERR(data->pins_default)) + if (pinctrl_select_state(data->pinctrl, data->pins_default)) + dev_err(dev, "could not set default pins\n"); + /* restart the scan state machine */ ctrl = __raw_readl(&data->regs->control); ctrl |= CONTROL_ENABLE; -- 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