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Subject: Re: [PATCH V4 1/4] mfd: f81504-core: Add Fintek F81504/508/512
 PCIE-to-UART/GPIO core support
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        linus.walleij@linaro.org, gnurou@gmail.com, gregkh@linuxfoundation.org,
        paul.gortmaker@windriver.com, lee.jones@linaro.org, jslaby@suse.com,
        gnomes@lxorguk.ukuu.org.uk, peter_hong@fintek.com.tw
References: <1456209003-22396-1-git-send-email-hpeter+linux_kernel@gmail.com>
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 <1456225517.13244.41.camel@linux.intel.com>
Cc: heikki.krogerus@linux.intel.com, peter@hurleysoftware.com,
        soeren.grunewald@desy.de, udknight@gmail.com, adam.lee@canonical.com,
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        Peter Hung <hpeter+linux_kernel@gmail.com>
From: Peter Hung <hpeter@gmail.com>
Message-ID: <56D69775.7080309@gmail.com>
Date: Wed, 2 Mar 2016 15:34:13 +0800
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Hi Andy,

Andy Shevchenko 於 2016/2/23 下午 07:05 寫道:
> On Tue, 2016-02-23 at 14:30 +0800, Peter Hung wrote:
>> +config MFD_FINTEK_F81504_CORE
>> +        tristate "Fintek F81504/508/512 PCIE-to-UART/GPIO MFD
>> support"
>> +        depends on PCI
>> +        select MFD_CORE
>> +        default SERIAL_8250
>
> SERIAL_8250_PCI ?

In my opinion, 8250_pci & f81504_core are independently drivers.
So I'll set the default to SERIAL_8250.

>> +static bool f81504_is_gpio(unsigned int idx, u8 gpio_en)
>> +{
>> +	unsigned int i;
>> +
>> +	/* Find every port to check is multi-function port */
>> +	for (i = 0; i < ARRAY_SIZE(fintek_gpio_mapping); i++) {
>
>
>> +		if (fintek_gpio_mapping[i] != idx || !(gpio_en &
>> BIT(i)))
>> +			continue;
>> +
>> +		/*
>> +		 * This port is multi-function and enabled as gpio
>> mode.
>> +		 * So we'll not configure it as serial port.
>> +		 */
>> +		return true;
>
> Perhaps
>
> if (fintek_gpio_mapping[i] == idx && (gpio_en & BIT(i)))
>   return true;

Your code is more simple and readable. I'll change it for V5

Thanks for your advices.
-- 
With Best Regards,
Peter Hung