linux-kernel - Re: [RFC PATCH] mfd: pm8x41: Naive function devices registration

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Date:	Fri, 25 Apr 2014 08:43:59 -0500
From:	Rob Herring <robherring2@...il.com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	Courtney Cavin <courtney.cavin@...ymobile.com>,
	Josh Cartwright <joshc@...eaurora.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [RFC PATCH] mfd: pm8x41: Naive function devices registration

On Fri, Apr 25, 2014 at 8:29 AM, Ivan T. Ivanov <iivanov@...sol.com> wrote:
> On Fri, 2014-04-25 at 08:00 -0500, Rob Herring wrote:
>> On Fri, Apr 25, 2014 at 7:32 AM, Ivan T. Ivanov <iivanov@...sol.com> wrote:
>> > From: "Ivan T. Ivanov" <iivanov@...sol.com>
>> >
>> > Currently functions that exist in both the controller at the
>> > same address offset can not be specified with the same names.
>> >
>> > Adding Unique Slave ID device address to prefix function
>> > device names fixes this.
>> >
>> > Function devices are SPMI devices, so register them on
>> > SPMI bus.
>> >
>> > Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
>> > ---
>> >  drivers/mfd/pm8x41.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++----
>>
>> No, this should be fixed in the core, not the driver.
>
> I think that at core level they are no issues.

By core, I mean the device naming conventions used by the DT platform
device code. There is a problem and it should be handled.

As I mentioned in the other thread, either we should not use the
address on non-translatable addresses like this or append the parent
address.

> There is no name clashes with "top level" devices.
>
> spmi@...{
>         ...
>         child@0 {
>                 compatible = "qcom,pm8941";
>                 reg = <0x0 SPMI_USID>;
>
>                 #address-cells = <1>;
>                 #size-cells = <0>;
>
>                 revid@100 {
>                         compatible = "qcom,qpnp-revid";
>                         reg = <0x100>;
>                 };
>         };
>
>         child@4 {
>                 compatible = "qcom,pm8841";
>                 reg = <0x4 SPMI_USID>;
>
>                 #address-cells = <1>;
>                 #size-cells = <0>;
>
>                 revid@100 {
>                         compatible = "qcom,qpnp-revid";
>                         reg = <0x100>;
>                 };
>         };
> };
>
> I don't have experience with SPMI devices, but it looks
> like address partitioning is specific to this "PMIC"
> controllers.
>
> Regards,
> Ivan
>
>>
>> Rob
>
>
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