Re: [PATCH v2 3/5] regulator: helper routine to extractregulator_init_data

[Shawn Guo]

On Mon, Oct 24, 2011 at 03:06:37PM +0200, Mark Brown wrote:
> On Mon, Oct 24, 2011 at 09:04:31PM +0800, Shawn Guo wrote:
> 
> > If we can attach the device_node of 'regulators' node to dev->of_node
> > when calling regulator_register(regulator_desc, dev, ...) from
> > regulator driver, the regulator core will be able to find all nodes under
> > 'regulators' using for_each_child_of_node(dev->of_node, child).
> 
> Please provide concrete examples of the bindings you're talking about,
> the really important thing here is how sane the bindings look and I've
> really got no idea what any of what you're talking about will look like
> or if they make sense.
> 
The only thing different from what I attached last time is the
compatible string added to 'regulators' node.

        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>;
                        mc13xxx-irq-gpios = <&gpio0 8 0>; /* GPIO1_8 */

                        regulators {
                        	compatible = "fsl,mc13892-regulator";

                                sw1reg: mc13892_sw1 {
                                        regulator-min-uV = <600000>;
                                        regulator-max-uV = <1375000>;
                                        regulator-change-voltage;
                                        regulator-boot-on;
                                        regulator-always-on;
                                };

                                sw2reg: mc13892_sw2 {
                                        regulator-min-uV = <900000>;
                                        regulator-max-uV = <1850000>;
                                        regulator-change-voltage;
                                        regulator-boot-on;
                                        regulator-always-on;
                                };

                                ......
                        };

                        leds {
                                ......
                        };

                        buttons {
                                ......
                        };
                };

                flash: at45db321d@1 {
                        ......
                };
        };

> > hesitate to hack this into mfd_add_devices(), so I would like to add
> > compatible string "fsl,mc13892-regulators" to node 'regulators' and
> > find the node using of_find_compatible_node(dev->parent, NULL,
> > "fsl,mc13892-regulators").
> 
> It's not immediately obvious to me that having a binding for the
> regulators separately makes sense, it's not a usefully distinct device.
> 
Fair point.  Actually, I also hate to have the finding of node
'regulators' plugged into regulator driver.  What about following
change to address Grant's concern on global device tree search?
 
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 8fe132d..29dcf90 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2673,7 +2673,8 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
        BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);

        /* find device_node and attach it */
-       rdev->dev.of_node = of_find_node_by_name(NULL, regulator_desc->name);
+       rdev->dev.of_node = of_find_node_by_name(dev->parent->of_node,
+                                                regulator_desc->name);

        /* register with sysfs */
        rdev->dev.class = &regulator_class;

-- 
Regards,
Shawn

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