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Message-ID: <20111024134025.GE1755@S2100-06.ap.freescale.net>
Date: Mon, 24 Oct 2011 21:40:26 +0800
From: Shawn Guo <shawn.guo@...escale.com>
To: Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC: Grant Likely <grant.likely@...retlab.ca>,
Rajendra Nayak <rnayak@...com>, <patches@...aro.org>,
<tony@...mide.com>, <devicetree-discuss@...ts.ozlabs.org>,
<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<lrg@...com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 3/5] regulator: helper routine to extract
regulator_init_data
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@...10000 { /* 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 = ®ulator_class;
--
Regards,
Shawn
--
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