linux-kernel - Re: [PATCH v3] serial: 8250_uniphier: add UniPhier serial driver

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Date:	Tue, 19 May 2015 12:13:51 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	Peter Hurley <peter@...leysoftware.com>,
	John Crispin <blogic@...nwrt.org>,
	Tony Lindgren <tony@...mide.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Joachim Eastwood <manabian@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-serial@...r.kernel.org,
	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Jiri Slaby <jslaby@...e.cz>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH v3] serial: 8250_uniphier: add UniPhier serial driver

2015-05-19 10:54 GMT+02:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> Hi Matthias,
>
> 2015-05-19 17:22 GMT+09:00 Matthias Brugger <matthias.bgg@...il.com>:
>> 2015-05-19 3:11 GMT+02:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
>>> Add the driver for on-chip UART used on UniPhier SoCs.
>>>
>>> This hardware is similar to 8250 with a slightly different register
>>> mapping, so it should go into drivers/tty/serial/8250 directory.
>>
>> The patch is for a driver in this folder, so no need to but it in the
>> commit message.
>> Instead just write a short description about the difference to a
>> standard 8250 device.
>>
>>>
>>> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>>> ---
>>>
>>> Changes in v3:
>>>   - Just add *_SHIFT macro for the special case
>>>
>>> Changes in v2:
>>>   - Drop unnecessary #include <linux/init.h>
>>>   - Sort includes in alphabetical order
>>>   - Use devm_clk_get() rather than of_clk_get()
>>>   - Delete unneeded clk_put() from uniphier_uart_remove callback
>>>   - Delete unneeded IS_ERR_OR_NULL check from uniphier_uart_remove callback
>>>   - Use UNIPHIER_UART_*_SHIFT instead of hard-coded shift values
>>>   - Change the first argument type of uniphier_of_serial_setup()
>>>     from (struct platform_device *) to (struct device *) for code-cleanup.
>>>
>>>  drivers/tty/serial/8250/8250_uniphier.c | 237 ++++++++++++++++++++++++++++++++
>>>  drivers/tty/serial/8250/Kconfig         |   7 +
>>>  drivers/tty/serial/8250/Makefile        |   1 +
>>>  3 files changed, 245 insertions(+)
>>>  create mode 100644 drivers/tty/serial/8250/8250_uniphier.c
>>>
>>> diff --git a/drivers/tty/serial/8250/8250_uniphier.c b/drivers/tty/serial/8250/8250_uniphier.c
>>> new file mode 100644
>>> index 0000000..50349bf
>>> --- /dev/null
>>> +++ b/drivers/tty/serial/8250/8250_uniphier.c
>>> @@ -0,0 +1,237 @@
>>> +/*
>>> + * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@...ionext.com>
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License as published by
>>> + * the Free Software Foundation; either version 2 of the License, or
>>> + * (at your option) any later version.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + */
>>> +
>>> +#include <linux/clk.h>
>>> +#include <linux/io.h>
>>> +#include <linux/module.h>
>>> +#include <linux/of.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/serial_8250.h>
>>> +#include <linux/serial_core.h>
>>> +#include <linux/serial_reg.h>
>>> +#include "8250.h"
>>> +
>>> +/* Most (but not all) of UniPhier UART devices have 64-depth FIFO. */
>>> +#define UNIPHIER_UART_DEFAULT_FIFO_SIZE        64
>>> +
>>> +#define UNIPHIER_UART_CHAR_FCR 3       /* Character / FIFO Control Register */
>>> +#define UNIPHIER_UART_LCR_MCR  4       /* Line/Modem Control Register */
>>> +#define     UNIPHIER_UART_LCR_SHIFT    8
>>> +#define UNIPHIER_UART_DLR      9       /* Divisor Latch Register */
>>
>> Nit pick: Please fix identation. After "define" just put one blank.
>> I personally prefer that the define values are aligned by tabs, but
>> that's up tu you.
>>
>
> I intentionally use deeper indentation for *_SHIFT
> because I want to clearly show  UNIPHIER_UART_LCR_SHIFT
> belongs to UNIPHIER_UART_LCR_MCR register.
>
> I also want to describe them within 80 columns including comments,
> so I cannot insert extra TABs to align the values.

Ok, than from my side that's fine as it is.
Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

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