linux-kernel - Re: [PATCH v3 2/4] mfd: pm8xxx-spmi: document DT bindings for Qualcomm SPMI PMICs

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Message-ID: <53DA054D.2050508@mm-sol.com>
Date:	Thu, 31 Jul 2014 11:58:53 +0300
From:	Stanimir Varbanov <svarbanov@...sol.com>
To:	David Collins <collinsd@...eaurora.org>
CC:	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Josh Cartwright <joshc@...eaurora.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v3 2/4] mfd: pm8xxx-spmi: document DT bindings for Qualcomm
 SPMI PMICs

On 07/30/2014 01:23 AM, David Collins wrote:
> On 07/24/2014 05:45 AM, Stanimir Varbanov wrote:
>> Document DT bindings used to describe the Qualcomm SPMI PMICs.
>> Currently the SPMI PMICs supported are pm8941, pm8841 and pma8084.
>>
>> Signed-off-by: Stanimir Varbanov <svarbanov@...sol.com>
> 
> (...)
>> +Required properties for peripheral child nodes:
>> +- compatible:      Should contain "qcom,pm8xxx-xxx", where "xxx" is
>> +                   peripheral name. The "pm8xxx" can be any of supported PMICs,
>> +                   see example below.
> 
> I don't think that this binding document should be imposing any formatting
> restrictions on the compatible strings for QPNP peripheral drivers.  The
> QPNP peripheral drivers in the downstream msm-3.10 tree [1] do not specify
> per-PMIC compatible strings.  This is because ideally, a given QPNP
> peripheral represents a hardware block that is identical in interface and
> operation between PMICs.
> 

Isn't "hardware block that is identical in interface and operation
between PMICs" exactly the meaning of *compatible* property?

No *compatible* property, no platform device. We must have this property
for every peripheral driver.

> These peripheral drivers determine the base address for a given device
> instance via device tree reg and reg-names properties.  In order for this
> to continue to work with the pm8xxx-spmi driver, some mechanism will need
> to be introduced which creates resource structs for the
> non-memory-mappable SPMI base addresses.  One possible solution is
> currently being discussed in another thread [2].  This document will need
> to be updated to show the child node reg property scheme once a solution
> is reached.
> 

That's correct. If we reach the "reg" solution this binding document
must be changed.

> (...)
>> +Example:
>> +
>> +	pm8941@0 {
>> +		compatible = "qcom,pm8941";
>> +		reg = <0x0 SPMI_USID>;
>> +
>> +		rtc {
>> +			compatible = "qcom,pm8941-rtc";
>> +			interrupts = <0x0 0x61 0x1 IRQ_TYPE_EDGE_RISING>;
>> +			interrupt-names = "alarm";
>> +		};
>> +	};
> 
> Can you please expand your example to include the second SID for the
> PM8941 chip?  That way, it will be clear that each PMIC needs two DT
> nodes; one for each SID.

Sure, will do.

-- 
regards,
Stan
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