linux-kernel - Re: [PATCH v4 05/13] pinctrl: samsung: Switch to use for_each_gpiochip

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Message-ID: <3b527700-444e-1f6e-fee1-5cd6ed2ef7f9@linaro.org>
Date:   Sat, 9 Apr 2022 15:33:49 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Qianggui Song <qianggui.song@...ogic.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Marc Zyngier <maz@...nel.org>,
        Fabien Dessenne <fabien.dessenne@...s.st.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        openbmc@...ts.ozlabs.org, linux-renesas-soc@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Avi Fishman <avifishman70@...il.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v4 05/13] pinctrl: samsung: Switch to use
 for_each_gpiochip_node() helper

On 08/04/2022 17:39, Andy Shevchenko wrote:
> On Fri, Apr 08, 2022 at 05:22:21PM +0200, Krzysztof Kozlowski wrote:
>> On 01/04/2022 12:35, Andy Shevchenko wrote:
>>> Switch the code to use for_each_gpiochip_node() helper.
> 
> (...)
> 
>>>  /*
>>>   * Iterate over all driver pin banks to find one matching the name of node,
>>>   * skipping optional "-gpio" node suffix. When found, assign node to the bank.
>>>   */
>>> -static void samsung_banks_of_node_get(struct device *dev,
>>> -				      struct samsung_pinctrl_drv_data *d,
>>> -				      struct device_node *node)
>>> +static void samsung_banks_node_get(struct device *dev, struct samsung_pinctrl_drv_data *d)
>>
>> This is worth simplification anyway, so please split it to separate patch.
> 
> Not sure what to do and why it worth an additional churn.

Makes this change smaller so it's easier to review.

> 
>>>  {
>>>  	const char *suffix = "-gpio-bank";
>>>  	struct samsung_pin_bank *bank;
>>> -	struct device_node *child;
>>> +	struct fwnode_handle *child;
>>>  	/* Pin bank names are up to 4 characters */
>>>  	char node_name[20];
>>>  	unsigned int i;
>>> @@ -1038,17 +1037,17 @@ static void samsung_banks_of_node_get(struct device *dev,
>>>  			continue;
>>>  		}
>>>  
>>> -		for_each_child_of_node(node, child) {
>>> -			if (!of_find_property(child, "gpio-controller", NULL))
>>> -				continue;
>>
>> This does not look equivalent. There are nodes without this property.
> 
> Not sure I understand why not. The macro checks for the property and
> iterates over nodes that have this property.
> 
> Can you elaborate, please?

Eh, my bad, it is equivalent.

> 
>>> -			if (of_node_name_eq(child, node_name))
>>> +		for_each_gpiochip_node(dev, child) {
>>> +			struct device_node *np = to_of_node(child);
>>> +
>>> +			if (of_node_name_eq(np, node_name))
>>>  				break;
>>> -			else if (of_node_name_eq(child, bank->name))
>>> +			if (of_node_name_eq(np, bank->name))
>>>  				break;
>>>  		}
>>
>> This patch has to wait till someone provides you a tested-by. I might do
>> it around next week.
> 
> Fine with me, I will drop it from my repo for now.


Best regards,
Krzysztof