pinctrl: single: Add support for auxdata

For omaps, we still have dependencies to the legacy code
for handling the PRM (Power Reset Management) interrupts,
and also for reconfiguring the io wake-up chain after
changes.

Let's pass the PRM interrupt and the rearm functions via
auxdata. Then when at some point we have a proper PRM
driver, we can get the interrupt via device tree and
set up the rearm function as exported function in the
PRM driver.

By using auxdata we can remove a dependency to the
wake-up events for converting omap3 to be device
tree only.

Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Prakash Manjunathappa <prakash.pm@ti.com>
Cc: Roger Quadros <rogerq@ti.com>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index dad65df36f4b438aaaf246df91579ca86a22efb5..c2aada71c9150d623b35fbb76944801d4e9e4432 100644 (file)
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -28,6 +28,8 @@
 #include <linux/pinctrl/pinmux.h>
 #include <linux/pinctrl/pinconf-generic.h>
 
+#include <linux/platform_data/pinctrl-single.h>
+
 #include "core.h"
 #include "pinconf.h"
 
@@ -159,12 +161,14 @@ struct pcs_name {
  * @irq:       optional interrupt for the controller
  * @irq_enable_mask:   optional SoC specific interrupt enable mask
  * @irq_status_mask:   optional SoC specific interrupt status mask
+ * @rearm:     optional SoC specific wake-up rearm function
  */
 struct pcs_soc_data {
        unsigned flags;
        int irq;
        unsigned irq_enable_mask;
        unsigned irq_status_mask;
+       void (*rearm)(void);
 };
 
 /**
@@ -1622,6 +1626,8 @@ static void pcs_irq_unmask(struct irq_data *d)
        struct pcs_soc_data *pcs_soc = irq_data_get_irq_chip_data(d);
 
        pcs_irq_set(pcs_soc, d->irq, true);
+       if (pcs_soc->rearm)
+               pcs_soc->rearm();
 }
 
 /**
@@ -1672,6 +1678,11 @@ static int pcs_irq_handle(struct pcs_soc_data *pcs_soc)
                }
        }
 
+       /*
+        * For debugging on omaps, you may want to call pcs_soc->rearm()
+        * here to see wake-up interrupts during runtime also.
+        */
+
        return count;
 }
 
@@ -1835,6 +1846,7 @@ static int pcs_probe(struct platform_device *pdev)
 {
        struct device_node *np = pdev->dev.of_node;
        const struct of_device_id *match;
+       struct pcs_pdata *pdata;
        struct resource *res;
        struct pcs_device *pcs;
        const struct pcs_soc_data *soc;
@@ -1949,6 +1961,17 @@ static int pcs_probe(struct platform_device *pdev)
        if (pcs->socdata.irq)
                pcs->flags |= PCS_FEAT_IRQ;
 
+       /* We still need auxdata for some omaps for PRM interrupts */
+       pdata = dev_get_platdata(&pdev->dev);
+       if (pdata) {
+               if (pdata->rearm)
+                       pcs->socdata.rearm = pdata->rearm;
+               if (pdata->irq) {
+                       pcs->socdata.irq = pdata->irq;
+                       pcs->flags |= PCS_FEAT_IRQ;
+               }
+       }
+
        if (PCS_HAS_IRQ) {
                ret = pcs_irq_init_chained_handler(pcs, np);
                if (ret < 0)

diff --git a/include/linux/platform_data/pinctrl-single.h b/include/linux/platform_data/pinctrl-single.h
new file mode 100644 (file)
index 0000000..72eacda
--- /dev/null
+++ b/include/linux/platform_data/pinctrl-single.h
@@ -0,0 +1,12 @@
+/**
+ * irq:                optional wake-up interrupt
+ * rearm:      optional soc specific rearm function
+ *
+ * Note that the irq and rearm setup should come from device
+ * tree except for omap where there are still some dependencies
+ * to the legacy PRM code.
+ */
+struct pcs_pdata {
+       int irq;
+       void (*rearm)(void);
+};