linux-kernel - Re: [PATCH 0/3] Add initial DT support for Qualcomm SPMI PMIC devices

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Message-ID: <1424967957.2340.30.camel@mm-sol.com>
Date:	Thu, 26 Feb 2015 18:25:57 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 0/3] Add initial DT support for Qualcomm SPMI PMIC
 devices


Hi Stephan, 

Sorry for delayed answer.

On Thu, 2015-02-19 at 16:49 -0800, Stephen Boyd wrote:
> On 02/03/15 04:17, Ivan T. Ivanov wrote:
> > Following set of patches add initial DT support for PMIC devices
> > found on recent Quqalcomm chipsets. Details for SPMI bus and PMIC arbiter
> > could be found here [1].
> 
> Can you please put the specific compatible strings for the pmic model
> into the nodes in addition to the generic "qcom,spmi-pmic"? We may want
> to have regmap config tables in the future that describe the
> cache/read/write abilities of the regsiters. If all we have is the
> generic binding then we don't have a way to populate these tables.
> Unless the plan there is to use the revid registers?
> 

I would really like that we can use "revid" registers, but I don't know... 

>From what I can see usually in one physical PMIC chip they
are 2 USID devices.

I can successfully discover following USID's on APQ8074 boards:

pmic-spmi 0-00: qcom,pm8941-v1.0 detected
pmic-spmi 0-01: qcom,pm8941-v1.0 detected
pmic-spmi 0-04: qcom,pm8841-v0.0 detected
pmic-spmi 0-05: qcom,pm8841-v0.0 detected

Unfortunately on PM8916 only one device is detected, with USID 0.
But they should be two, judging by downstream DTS files, right?

pmic-spmi 0-00: qcom,pm8916-v0.0 detected 
pmic-spmi 0-01: unknown device

For communication with PM8916 I am using recent patches from Gilad [1].
Maybe there are still some issues with these patches, which can cause
this behavior or PM8916 just didn't have these registers for USID 1?

Regards,
Ivan 

[1] https://lkml.org/lkml/2015/2/19/453

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