linux-kernel - Re: [PATCH v7 6/8] i3c: target: func: add tty driver

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Date: Tue, 6 Feb 2024 13:54:42 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Frank Li <Frank.Li@....com>
cc: alexandre.belloni@...tlin.com, conor.culhane@...vaco.com, 
    devicetree@...r.kernel.org, 
    Greg Kroah-Hartman <gregkh@...uxfoundation.org>, imx@...ts.linux.dev, 
    Jiri Slaby <jirislaby@...nel.org>, joe@...ches.com, 
    krzysztof.kozlowski+dt@...aro.org, krzysztof.kozlowski@...aro.org, 
    linux-i3c@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>, 
    linux-serial <linux-serial@...r.kernel.org>, miquel.raynal@...tlin.com, 
    robh@...nel.org, zbigniew.lukwinski@...ux.intel.com
Subject: Re: [PATCH v7 6/8] i3c: target: func: add tty driver

On Mon, 5 Feb 2024, Frank Li wrote:

> Add tty over I3C target function driver.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> 
> Notes:
>     Change from v4 to v5
>     - remove void*
>     - include bitfield.h
>     - remove extra ()
>     - oneline for struct ttyi3c_port *sport
> 
>  drivers/i3c/Kconfig       |   3 +
>  drivers/i3c/Makefile      |   1 +
>  drivers/i3c/func/Kconfig  |   9 +
>  drivers/i3c/func/Makefile |   3 +
>  drivers/i3c/func/tty.c    | 474 ++++++++++++++++++++++++++++++++++++++
>  5 files changed, 490 insertions(+)
>  create mode 100644 drivers/i3c/func/Kconfig
>  create mode 100644 drivers/i3c/func/Makefile
>  create mode 100644 drivers/i3c/func/tty.c
> 
> diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig
> index d59a7eb83d13a..fca808cda87b3 100644
> --- a/drivers/i3c/Kconfig
> +++ b/drivers/i3c/Kconfig
> @@ -48,3 +48,6 @@ config I3C_TARGET_CONFIGFS
>  	  the target function and used to bind the function with a target
>  	  controller.
>  
> +if I3C_TARGET
> +source "drivers/i3c/func/Kconfig"
> +endif # I3C_TARGET
> diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile
> index c275aeae8970c..11f026d6876fe 100644
> --- a/drivers/i3c/Makefile
> +++ b/drivers/i3c/Makefile
> @@ -4,3 +4,4 @@ obj-$(CONFIG_I3C)		+= i3c.o
>  obj-$(CONFIG_I3C_TARGET)                += target.o
>  obj-$(CONFIG_I3C_TARGET_CONFIGFS)       += i3c-cfs.o
>  obj-$(CONFIG_I3C)		+= master/
> +obj-$(CONFIG_I3C_TARGET)	+= func/
> diff --git a/drivers/i3c/func/Kconfig b/drivers/i3c/func/Kconfig
> new file mode 100644
> index 0000000000000..7115129eb7d5a
> --- /dev/null
> +++ b/drivers/i3c/func/Kconfig
> @@ -0,0 +1,9 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +config I3C_TARGET_FUNC_TTY
> +	tristate "I3C target tty driver"
> +	depends on I3C_TARGET
> +	help
> +	  I3C Target TTY Function Driver.
> +
> +	  General TTY over I3C target controller function drivers.
> diff --git a/drivers/i3c/func/Makefile b/drivers/i3c/func/Makefile
> new file mode 100644
> index 0000000000000..16b3b9301496b
> --- /dev/null
> +++ b/drivers/i3c/func/Makefile
> @@ -0,0 +1,3 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +obj-$(CONFIG_I3C_TARGET_FUNC_TTY)              += tty.o
> diff --git a/drivers/i3c/func/tty.c b/drivers/i3c/func/tty.c
> new file mode 100644
> index 0000000000000..50673bfb6a003
> --- /dev/null
> +++ b/drivers/i3c/func/tty.c
> @@ -0,0 +1,474 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2023 NXP
> + * Author: Frank Li <Frank.Li@....com>
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/iopoll.h>
> +#include <linux/i3c/target.h>
> +#include <linux/serial_core.h>
> +#include <linux/slab.h>
> +#include <linux/tty_flip.h>
> +
> +static DEFINE_IDR(i3c_tty_minors);
> +
> +static struct tty_driver *i3c_tty_driver;
> +
> +#define I3C_TTY_MINORS		8
> +
> +#define I3C_TX_NOEMPTY		BIT(0)
> +#define I3C_TTY_TRANS_SIZE	16
> +#define I3C_TTY_IBI_TX		BIT(0)

This is #include <linux/bits.h>

..which will include <vdso/bits.h> that contains the actual definition.

#include <bitfield.h> is for FIELD_GET/PREP(), etc.

> +struct ttyi3c_port {
> +	struct tty_port port;
> +	int minor;
> +	struct i3c_target_func *i3cdev;
> +	struct completion txcomplete;
> +	spinlock_t xlock;
> +	void *buffer;
> +	struct work_struct work;

This file seems to also lack some includes. Please go through your 
#include in the series and add those you use.

-- 
 i.