linux-kernel - Re: [PATCH] mfd: qcom-spmi-pmic: Add support for more chips versions

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Date:	Wed, 5 Nov 2014 17:36:59 -0800
From:	Bjorn Andersson <bjorn@...o.se>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
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>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Stanimir Varbanov <svarbanov@...sol.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH] mfd: qcom-spmi-pmic: Add support for more chips versions

On Wed, Nov 5, 2014 at 10:31 AM, Ivan T. Ivanov <iivanov@...sol.com> wrote:
>
> On Wed, 2014-11-05 at 10:11 -0800, Bjorn Andersson wrote:
>> On Tue, Nov 4, 2014 at 5:33 AM, Ivan T. Ivanov <iivanov@...sol.com>
>> wrote:
>> [..]
>> > @@ -28,11 +144,27 @@ static int pmic_spmi_probe(struct spmi_device
>> > *sdev)
>> >  {
>> >         struct device_node *root = sdev->dev.of_node;
>> >         struct regmap *regmap;
>> > +       struct property *prop;
>> > +       int major, minor, ret;
>> > +       char *name, compatible[32];
>> >
>> >         regmap = devm_regmap_init_spmi_ext(sdev,
>> > &spmi_regmap_config);
>> >         if (IS_ERR(regmap))
>> >                 return PTR_ERR(regmap);
>> >
>> > +       ret = pmic_spmi_read_revid(regmap, &name, &major, &minor);
>> > +       if (!ret) {
>> > +               snprintf(compatible, ARRAY_SIZE(compatible),
>> > "qcom,%s-v%d.%d",
>> > +                        name, major, minor);
>> > +               prop = kzalloc(sizeof(*prop), GFP_KERNEL);
>> > +               if (prop) {
>> > +                       prop->name = kstrdup("compatible",
>> > GFP_KERNEL);
>> > +                       prop->value = kstrdup(compatible,
>> > GFP_KERNEL);
>> > +                       prop->length = strlen(prop->value);
>> > +                       of_update_property(root, prop);
>> > +               }
>> > +       }
>> > +
>>
>> Why would you do this?
>> What benefit does it give to patch the of_node to have a more
>> specific
>> compatible?
>
> Some of the child device drivers have to know PMIC chip revision.
>

So your plan is to have a strstr(parent->compatible, "-v2") there?

Could you be a little bit more elaborate on what you're trying to do
and which child devices that might be?

Regards,
Bjorn
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