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Message-ID: <20111024145139.GH1755@S2100-06.ap.freescale.net>
Date: Mon, 24 Oct 2011 22:51:40 +0800
From: Shawn Guo <shawn.guo@...escale.com>
To: Grant Likely <grant.likely@...retlab.ca>
CC: Mark Brown <broonie@...nsource.wolfsonmicro.com>,
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 03:59:50PM +0200, Grant Likely wrote:
> On Mon, Oct 24, 2011 at 09:40:26PM +0800, Shawn Guo wrote:
> > 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);
>
> of_find_node_by_name() doesn't work that way. The first argument is a
> starting point, but it doesn't restrict the search to children of a
> node.
>
> for_each_child_of_node() is what you want to use when iterating over
> the children which unfortunately changes the structure of this
> function.
>
The dev->parent->of_node is meant to point to node 'pmic: mc13892@0'.
And the intention here is not to iterate over the children, but to
start a search from a reasonable point rather than the top root node.
--
Regards,
Shawn
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