linux-kernel - Re: [PATCH 1/5] mfd: Add support for Intel LJCA device

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Date:   Mon, 6 Mar 2023 10:55:46 +0800
From:   "Ye, Xiang" <xiang.ye@...el.com>
To:     Lee Jones <lee@...nel.org>
CC:     Wolfram Sang <wsa@...nel.org>, Tyrone Ting <kfting@...oton.com>,
        "Mark Brown" <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Bartosz Golaszewski" <brgl@...ev.pl>, <linux-usb@...r.kernel.org>,
        <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <srinivas.pandruvada@...el.com>, <heikki.krogerus@...ux.intel.com>,
        <andriy.shevchenko@...ux.intel.com>,
        <sakari.ailus@...ux.intel.com>, <zhifeng.wang@...el.com>,
        <wentong.wu@...el.com>, <lixu.zhang@...el.com>
Subject: Re: [PATCH 1/5] mfd: Add support for Intel LJCA device

Hi Lee,

Thanks for the review.
On Sun, Mar 05, 2023 at 10:34:56AM +0000, Lee Jones wrote:
> On Mon, 20 Feb 2023, Ye Xiang wrote:
> 
> > This patch implements the USB part of Intel USB-I2C/GPIO/SPI adapter
> > device named "La Jolla Cove Adapter" (LJCA).
> 
> The "USB part" should live in drivers/usb.
What about putting ljca.c to drivers/usb/misc?
> 
> You can use MFD to register each of the components, but all of the USB
> functionality needs moving somewhere else.
Ok, Now the USB functionality drivers have already been put to related driver
folders: spi-ljca in drivers/spi, i2c-ljca in drivers/i2c, and gpio-ljca
in drivers/gpio.
>  
> > The communication between the various LJCA module drivers and the
> > hardware will be muxed/demuxed by this driver. The sub-module of
> > LJCA can use ljca_transfer() to issue a transfer between host
> > and hardware.
> > 
> > Each sub-module of LJCA device is identified by type field within
> > the LJCA message header.
> > 
> > The minimum code in ASL that covers this board is
> > Scope (\_SB.PCI0.DWC3.RHUB.HS01)
> >     {
> >         Device (GPIO)
> >         {
> >             Name (_ADR, Zero)
> >             Name (_STA, 0x0F)
> >         }
> > 
> >         Device (I2C)
> >         {
> >             Name (_ADR, One)
> >             Name (_STA, 0x0F)
> >         }
> > 
> >         Device (SPI)
> >         {
> >             Name (_ADR, 0x02)
> >             Name (_STA, 0x0F)
> >         }
> >     }
> > 
> > Signed-off-by: Ye Xiang <xiang.ye@...el.com>
> > ---
> >  drivers/mfd/Kconfig      |  13 +
> >  drivers/mfd/Makefile     |   1 +
> >  drivers/mfd/ljca.c       | 977 +++++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/ljca.h |  95 ++++
> >  4 files changed, 1086 insertions(+)
> >  create mode 100644 drivers/mfd/ljca.c
> >  create mode 100644 include/linux/mfd/ljca.h
> 
> -- 
> Lee Jones [李琼斯]