linux-kernel - Re: [PATCH v6 33/52] memory: tegra20: Support interconnect framework

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Date:   Tue, 27 Oct 2020 23:25:31 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Viresh Kumar <vireshk@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v6 33/52] memory: tegra20: Support interconnect framework

27.10.2020 13:09, Krzysztof Kozlowski пишет:
...
>> +err_msg:
>> +	dev_err(emc->dev, "failed to initialize ICC: %d\n", err);
> 
> You will print such errors on all existing DTBs. Since it is not a
> failure of probe (it is actually quite expected, normal situation when
> booting with older DTB), let's change it to warning (here and in all
> other places and drivers).

The existing DTBs will be stopped on the error message below.

>> +
>> +	return err;
>> +}
>> +
>> +static int tegra_emc_opp_table_init(struct tegra_emc *emc)
>> +{
>> +	const char *rname = "core";
>> +	int err;
>> +
>> +	/*
>> +	 * Legacy device-trees don't have OPP table and EMC driver isn't
>> +	 * useful in this case.
>> +	 */
>> +	if (!device_property_present(emc->dev, "operating-points-v2")) {
>> +		dev_err(emc->dev, "OPP table not found\n");
>> +		dev_err(emc->dev, "please update your device tree\n");
>> +		return -ENODEV;
>> +	}

The existing DTBs are stopped here.

...
>> +	err = tegra_emc_opp_table_init(emc);
>> +	if (err)
>> +		goto unreg_notifier;
> 
> This looks like the ABI break I mentioned around DT bindings. Are the
> bindings marked as unstable?

This T20 EMC driver wasn't ever used so far at all and this series makes
it useful. Hence I think it should be fine to assume that the T20 EMC
ABI is unstable.