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

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Message-ID: <ZcJO0u8rKgrIH4k8@lizhi-Precision-Tower-5810>
Date: Tue, 6 Feb 2024 10:22:58 -0500
From: Frank Li <Frank.li@....com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.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 Tue, Feb 06, 2024 at 01:54:42PM +0200, Ilpo Järvinen wrote:
> 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.

Do you have tools to check?  It is easy to missed some header files.

Frank

> 
> -- 
>  i.
>