linux-kernel - Re: [PATCH RESEND 1/1] serial: 8250_pci: Fix real serial port count for F81504/508/512

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Date:	Tue, 15 Dec 2015 10:56:08 +0800
From:	Peter Hung <hpeter@...il.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, jslaby@...e.com,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	tom_tsai@...tek.com.tw, Peter H <peter_hong@...tek.com.tw>,
	Peter Hung <hpeter+linux_kernel@...il.com>
Subject: Re: [PATCH RESEND 1/1] serial: 8250_pci: Fix real serial port count
 for F81504/508/512

Hello,

Andy Shevchenko 於 2015/12/13 上午 09:08 寫道:
> On Tue, Dec 1, 2015 at 8:54 AM, Peter Hung <hpeter@...il.com> wrote:

> First of all, maybe you can consider to split this part of the driver
> to separate one? (Like we did for 8250_mid.c). It seems 8250_pci is
> too bloated. But it's just an idea, maybe for future.

It's a good idea. Our PCI-to-UART device is a multifunctional
(GPIO/UART) board, I need try to split it from 8250_pci.c to
implements all functions.

>>
>> +/* The device is multi-function with UART & GPIO */
>> +static u8 fintek_gpio_mapping[] = {2, 3, 8, 9, 10, 11};
>
> Clearly you have bit combination here
> Bit 1: 1
> Bit 3: 1
>
> So, mask as 0x0a shall cover this IIAC.

IMO, It maybe wrong. If we checked only with 0x0a mask,
the 0x06 & 0x07 will be passed.

I had try with k-map to reduce from 0~11 (12~15 for don't care).
The final boolean value is a + c b(bar) for a is MSB.

>> -       config_base = 0x40 + 0x08 * idx;
>> +       switch (pdev->device) {
>> +       case 0x1104: /* 4 ports */
>
> Maybe you can introduce constants for IDs.

I'll make the magic numbers with #define marco.

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