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Message-Id: <dcb805e1-2b48-481d-8e72-1b515c9d43e6@app.fastmail.com> Date: Thu, 09 Mar 2023 08:56:05 +0100 From: "Arnd Bergmann" <arnd@...db.de> To: "Ye Xiang" <xiang.ye@...el.com>, "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>, "Matthias Kaehlcke" <mka@...omium.org>, "Lee Jones" <lee@...nel.org>, "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, "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org> Cc: srinivas.pandruvada@...el.com, heikki.krogerus@...ux.intel.com, "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>, "Sakari Ailus" <sakari.ailus@...ux.intel.com>, zhifeng.wang@...el.com, wentong.wu@...el.com, lixu.zhang@...el.com Subject: Re: [PATCH v4 1/5] mfd: Add support for Intel LJCA device On Thu, Mar 9, 2023, at 08:10, Ye Xiang wrote: > 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) > } > } I'm a bit confused by this bit, does that mean this only works if the device is integrated on the mainboard and the BIOS is aware of it? This won't work if you plug it into a random USB port, or have no ACPI firmware, right? > Signed-off-by: Ye Xiang <xiang.ye@...el.com> > Reviewed-by: Sakari Ailus <sakari.ailus@...ux.intel.com> > --- > drivers/usb/misc/Kconfig | 13 + > drivers/usb/misc/Makefile | 1 + > drivers/usb/misc/ljca.c | 969 ++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/ljca.h | 95 ++++ Why is this in driver/usb/misc? It looks like a normal mfd driver to me, and it evenhas the header in include/linux/mfd/ Arnd
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