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

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Message-ID: <CABuKBeJwOp3Km=Vw+xn8cRtH8DC-TNB_m7s8WSdPxzKHdzrdcw@mail.gmail.com>
Date:	Tue, 19 May 2015 10:22:06 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	linux-serial@...r.kernel.org,
	Joachim Eastwood <manabian@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Jiri Slaby <jslaby@...e.cz>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Peter Hurley <peter@...leysoftware.com>,
	Alan Cox <alan@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	John Crispin <blogic@...nwrt.org>,
	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v3] serial: 8250_uniphier: add UniPhier serial driver

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.

With these changes you can add:
Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

Thanks,
Matthias

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