linux-kernel - Re: [PATCH v5 3/3] regulator: tps6594-regulator: Add driver for TI TPS6594 regulators

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Date:   Wed, 7 Jun 2023 13:44:46 +0200
From:   jerome Neanne <jneanne@...libre.com>
To:     andy.shevchenko@...il.com, Esteban Blanc <eblanc@...libre.com>
Cc:     linus.walleij@...aro.org, lgirdwood@...il.com, broonie@...nel.org,
        a.zummo@...ertech.it, alexandre.belloni@...tlin.com,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-rtc@...r.kernel.org, jpanis@...libre.com,
        aseketeli@...libre.com, u-kumar1@...com
Subject: Re: [PATCH v5 3/3] regulator: tps6594-regulator: Add driver for TI
 TPS6594 regulators


> 
>> +	enum {
>> +		MULTI_BUCK12,
>> +		MULTI_BUCK123,
>> +		MULTI_BUCK1234,
>> +		MULTI_BUCK12_34,
> 
>> +		MULTI_FIRST = MULTI_BUCK12,
>> +		MULTI_LAST = MULTI_BUCK12_34,
>> +		MULTI_NUM = MULTI_LAST - MULTI_FIRST + 1
> 
> 		MULT_NUM
> 
> will suffice instead all this.
> 
>> +	};
> 
> But why enum at all? See below.
Just for the switch case readability.
I have to iterate across the multiphases array for look up name into 
device tree and evaluate in that order.

This can be reduced to:
	enum {
		MULTI_BUCK12,
		MULTI_BUCK123,
		MULTI_BUCK1234,
		MULTI_BUCK12_34,
		MULTI_NUM = MULTI_BUCK12_34 - MULTI_BUCK12 + 1
	};

> 
> ...
> 
>> +	/*
>> +	 * Switch case defines different possible multi phase config
>> +	 * This is based on dts buck node name.
>> +	 * Buck node name must be chosen accordingly.
>> +	 * Default case is no Multiphase buck.
>> +	 * In case of Multiphase configuration, value should be defined for
>> +	 * buck_configured to avoid creating bucks for every buck in multiphase
>> +	 */
>> +	for (multi = MULTI_FIRST; multi < MULTI_NUM; multi++) {
>> +		np = of_find_node_by_name(tps->dev->of_node, multiphases[multi]);
>> +		npname = of_node_full_name(np);
>> +		np_pmic_parent = of_get_parent(of_get_parent(np));
>> +		if (of_node_cmp(of_node_full_name(np_pmic_parent), tps->dev->of_node->full_name))
> 
> Why not of_node_full_name() in the second case?
Sure.
> 
> 
>> +			continue;
>> +		delta = strcmp(npname, multiphases[multi]);
>> +		if (!delta) {
>> +			switch (multi) {
>> +			case MULTI_BUCK12:
> 
> This all looks like match_string() reinvention.
I can go with match_string but this is not significantly changing the game:

index = match_string(multiphases, ARRAY_SIZE(multiphases), npname);
if (index >= 0) {
	switch (index) {

No question on all your other feedback. Just wondering if I missed 
something with match_string use. Looks like a good idea indeed but this 
is not drastically changing the code as you seem to expect... Let me 
know if you think I'm doing it in a wrong way.

Regards,
Jerome.