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 <mugunthanvnm@xxxxxx>
---
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..be81d3e 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
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