mfd: Add device tree probe support for mc13xxx

This adds device tree probe support for mc13xxx mfd driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 128 insertions, 31 deletions

diff --git a/Documentation/devicetree/bindings/mfd/mc13xxx.txt b/Documentation/devicetree/bindings/mfd/mc13xxx.txt
new file mode 100644
index 000000000000..4ed46a610633
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/mc13xxx.txt
@@ -0,0 +1,53 @@
+* Freescale MC13783/MC13892 Power Management Integrated Circuit (PMIC)
+
+Required properties:
+- compatible : Should be "fsl,mc13783" or "fsl,mc13892"
+
+Optional properties:
+- fsl,mc13xxx-uses-adc : Indicate the ADC is being used
+- fsl,mc13xxx-uses-codec : Indicate the Audio Codec is being used
+- fsl,mc13xxx-uses-rtc : Indicate the RTC is being used
+- fsl,mc13xxx-uses-touch : Indicate the touchscreen controller is being used
+
+Sub-nodes:
+- regulators : Contain the regulator nodes.  The name of regulator node
+  is being used by mc13xxx regulator driver to find the correct relator
+  device.
+
+  The bindings details of individual regulator device can be found in:
+  Documentation/devicetree/bindings/regulator/regulator.txt
+
+Examples:
+
+ecspi@70010000 { /* ECSPI1 */
+        fsl,spi-num-chipselects = <2>;
+        cs-gpios = <&gpio3 24 0>, /* GPIO4_24 */
+                   <&gpio3 25 0>; /* GPIO4_25 */
+        status = "okay";
+
+        pmic: mc13892@0 {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                compatible = "fsl,mc13892";
+                spi-max-frequency = <6000000>;
+                reg = <0>;
+                interrupt-parent = <&gpio0>;
+                interrupts = <8>;
+
+                regulators {
+                        sw1_reg: mc13892__sw1 {
+                                regulator-min-microvolt = <600000>;
+                                regulator-max-microvolt = <1375000>;
+                                regulator-boot-on;
+                                regulator-always-on;
+                        };
+
+                        sw2_reg: mc13892__sw2 {
+                                regulator-min-microvolt = <900000>;
+                                regulator-max-microvolt = <1850000>;
+                                regulator-boot-on;
+                                regulator-always-on;
+                        };
+                };
+        };
+};
diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c
index d0d3dfafba5c..7122386b4e3c 100644
--- a/drivers/mfd/mc13xxx-core.c
+++ b/drivers/mfd/mc13xxx-core.c
@@ -18,11 +18,15 @@
 #include <linux/spi/spi.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/mc13xxx.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
 
 struct mc13xxx {
         struct spi_device *spidev;
         struct mutex lock;
         int irq;
+        int flags;
 
         irq_handler_t irqhandler[MC13XXX_NUM_IRQ];
         void *irqdata[MC13XXX_NUM_IRQ];
@@ -550,10 +554,7 @@ static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx)
 
 int mc13xxx_get_flags(struct mc13xxx *mc13xxx)
 {
-        struct mc13xxx_platform_data *pdata =
-                dev_get_platdata(&mc13xxx->spidev->dev);
-
-        return pdata->flags;
+        return mc13xxx->flags;
 }
 EXPORT_SYMBOL(mc13xxx_get_flags);
 
@@ -696,17 +697,67 @@ static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format)
         return mc13xxx_add_subdevice_pdata(mc13xxx, format, NULL, 0);
 }
 
+#ifdef CONFIG_OF
+static int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
+{
+        struct device_node *np = mc13xxx->spidev->dev.of_node;
+
+        if (!np)
+                return -ENODEV;
+
+        if (of_get_property(np, "fsl,mc13xxx-uses-adc", NULL))
+                mc13xxx->flags |= MC13XXX_USE_ADC;
+
+        if (of_get_property(np, "fsl,mc13xxx-uses-codec", NULL))
+                mc13xxx->flags |= MC13XXX_USE_CODEC;
+
+        if (of_get_property(np, "fsl,mc13xxx-uses-rtc", NULL))
+                mc13xxx->flags |= MC13XXX_USE_RTC;
+
+        if (of_get_property(np, "fsl,mc13xxx-uses-touch", NULL))
+                mc13xxx->flags |= MC13XXX_USE_TOUCHSCREEN;
+
+        return 0;
+}
+#else
+static inline int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
+{
+        return -ENODEV;
+}
+#endif
+
+static const struct spi_device_id mc13xxx_device_id[] = {
+        {
+                .name = "mc13783",
+                .driver_data = MC13XXX_ID_MC13783,
+        }, {
+                .name = "mc13892",
+                .driver_data = MC13XXX_ID_MC13892,
+        }, {
+                /* sentinel */
+        }
+};
+MODULE_DEVICE_TABLE(spi, mc13xxx_device_id);
+
+static const struct of_device_id mc13xxx_dt_ids[] = {
+        { .compatible = "fsl,mc13783", .data = (void *) MC13XXX_ID_MC13783, },
+        { .compatible = "fsl,mc13892", .data = (void *) MC13XXX_ID_MC13892, },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
+
 static int mc13xxx_probe(struct spi_device *spi)
 {
+        const struct of_device_id *of_id;
+        struct spi_driver *sdrv = to_spi_driver(spi->dev.driver);
         struct mc13xxx *mc13xxx;
         struct mc13xxx_platform_data *pdata = dev_get_platdata(&spi->dev);
         enum mc13xxx_id id;
         int ret;
 
-        if (!pdata) {
-                dev_err(&spi->dev, "invalid platform data\n");
-                return -EINVAL;
-        }
+        of_id = of_match_device(mc13xxx_dt_ids, &spi->dev);
+        if (of_id)
+                sdrv->id_table = &mc13xxx_device_id[(enum mc13xxx_id) of_id->data];
 
         mc13xxx = kzalloc(sizeof(*mc13xxx), GFP_KERNEL);
         if (!mc13xxx)
@@ -749,28 +800,33 @@ err_revision:
 
         mc13xxx_unlock(mc13xxx);
 
-        if (pdata->flags & MC13XXX_USE_ADC)
+        if (mc13xxx_probe_flags_dt(mc13xxx) < 0 && pdata)
+                mc13xxx->flags = pdata->flags;
+
+        if (mc13xxx->flags & MC13XXX_USE_ADC)
                 mc13xxx_add_subdevice(mc13xxx, "%s-adc");
 
-        if (pdata->flags & MC13XXX_USE_CODEC)
+        if (mc13xxx->flags & MC13XXX_USE_CODEC)
                 mc13xxx_add_subdevice(mc13xxx, "%s-codec");
 
-        mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",
-                &pdata->regulators, sizeof(pdata->regulators));
-
-        if (pdata->flags & MC13XXX_USE_RTC)
+        if (mc13xxx->flags & MC13XXX_USE_RTC)
                 mc13xxx_add_subdevice(mc13xxx, "%s-rtc");
 
-        if (pdata->flags & MC13XXX_USE_TOUCHSCREEN)
+        if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
                 mc13xxx_add_subdevice(mc13xxx, "%s-ts");
 
-        if (pdata->leds)
+        if (pdata) {
+                mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",
+                        &pdata->regulators, sizeof(pdata->regulators));
                 mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
                                 pdata->leds, sizeof(*pdata->leds));
-
-        if (pdata->buttons)
                 mc13xxx_add_subdevice_pdata(mc13xxx, "%s-pwrbutton",
                                 pdata->buttons, sizeof(*pdata->buttons));
+        } else {
+                mc13xxx_add_subdevice(mc13xxx, "%s-regulator");
+                mc13xxx_add_subdevice(mc13xxx, "%s-led");
+                mc13xxx_add_subdevice(mc13xxx, "%s-pwrbutton");
+        }
 
         return 0;
 }
@@ -788,24 +844,12 @@ static int __devexit mc13xxx_remove(struct spi_device *spi)
         return 0;
 }
 
-static const struct spi_device_id mc13xxx_device_id[] = {
-        {
-                .name = "mc13783",
-                .driver_data = MC13XXX_ID_MC13783,
-        }, {
-                .name = "mc13892",
-                .driver_data = MC13XXX_ID_MC13892,
-        }, {
-                /* sentinel */
-        }
-};
-MODULE_DEVICE_TABLE(spi, mc13xxx_device_id);
-
 static struct spi_driver mc13xxx_driver = {
         .id_table = mc13xxx_device_id,
         .driver = {
                 .name = "mc13xxx",
                 .owner = THIS_MODULE,
+                .of_match_table = mc13xxx_dt_ids,
         },
         .probe = mc13xxx_probe,
         .remove = __devexit_p(mc13xxx_remove),