twl4030_charger: Add devicetree support

This allows the charger to be enabled with devicetree, and allows the
parameters for charging the backup battery to be set.

Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Kumar Gala <galak@codeaurora.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>

diff --git a/Documentation/devicetree/bindings/power/twl-charger.txt b/Documentation/devicetree/bindings/power/twl-charger.txt
new file mode 100644 (file)
index 0000000..d5c7062
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/twl-charger.txt
@@ -0,0 +1,20 @@
+TWL BCI (Battery Charger Interface)
+
+Required properties:
+- compatible:
+  - "ti,twl4030-bci"
+- interrupts: two interrupt lines from the TWL SIH (secondary
+  interrupt handler) - interrupts 9 and 2.
+
+Optional properties:
+- ti,bb-uvolt: microvolts for charging the backup battery.
+- ti,bb-uamp: microamps for charging the backup battery.
+
+Examples:
+
+bci {
+   compatible = "ti,twl4030-bci";
+   interrupts = <9>, <2>;
+   ti,bb-uvolt = <3200000>;
+   ti,bb-uamp = <150>;
+};

diff --git a/arch/arm/boot/dts/twl4030.dtsi b/arch/arm/boot/dts/twl4030.dtsi
index ae6a17a..5a12540 100644 (file)
--- a/arch/arm/boot/dts/twl4030.dtsi
+++ b/arch/arm/boot/dts/twl4030.dtsi
@@ -19,6 +19,12 @@
                interrupts = <11>;
        };
 
+       charger: bci {
+               compatible = "ti,twl4030-bci";
+               interrupts = <9>, <2>;
+               bci3v1-supply = <&vusb3v1>;
+       };
+
        watchdog {
                compatible = "ti,twl4030-wdt";
        };

diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index d98abe9..f141088 100644 (file)
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -495,10 +495,38 @@ static enum power_supply_property twl4030_charger_props[] = {
        POWER_SUPPLY_PROP_CURRENT_NOW,
 };
 
+#ifdef CONFIG_OF
+static const struct twl4030_bci_platform_data *
+twl4030_bci_parse_dt(struct device *dev)
+{
+       struct device_node *np = dev->of_node;
+       struct twl4030_bci_platform_data *pdata;
+       u32 num;
+
+       if (!np)
+               return NULL;
+       pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+       if (!pdata)
+               return pdata;
+
+       if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
+               pdata->bb_uvolt = num;
+       if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
+               pdata->bb_uamp = num;
+       return pdata;
+}
+#else
+static inline const struct twl4030_bci_platform_data *
+twl4030_bci_parse_dt(struct device *dev)
+{
+       return NULL;
+}
+#endif
+
 static int __init twl4030_bci_probe(struct platform_device *pdev)
 {
        struct twl4030_bci *bci;
-       struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
+       const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
        int ret;
        u32 reg;
 
@@ -506,6 +534,9 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
        if (bci == NULL)
                return -ENOMEM;
 
+       if (!pdata)
+               pdata = twl4030_bci_parse_dt(&pdev->dev);
+
        bci->dev = &pdev->dev;
        bci->irq_chg = platform_get_irq(pdev, 0);
        bci->irq_bci = platform_get_irq(pdev, 1);
@@ -581,8 +612,11 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
 
        twl4030_charger_enable_ac(true);
        twl4030_charger_enable_usb(bci, true);
-       twl4030_charger_enable_backup(pdata->bb_uvolt,
-                                     pdata->bb_uamp);
+       if (pdata)
+               twl4030_charger_enable_backup(pdata->bb_uvolt,
+                                             pdata->bb_uamp);
+       else
+               twl4030_charger_enable_backup(0, 0);
 
        return 0;
 
@@ -631,10 +665,17 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
        return 0;
 }
 
+static const struct of_device_id twl_bci_of_match[] = {
+       {.compatible = "ti,twl4030-bci", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, twl_bci_of_match);
+
 static struct platform_driver twl4030_bci_driver = {
        .driver = {
                .name   = "twl4030_bci",
                .owner  = THIS_MODULE,
+               .of_match_table = of_match_ptr(twl_bci_of_match),
        },
        .remove = __exit_p(twl4030_bci_remove),
 };