All other UART DT binding documentation is under
Documentation/devicetree/bindings/serial/.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NRob Herring <robh@kernel.org>

We should say "The uart works in DCE mode".
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NRob Herring <robh@kernel.org>

We should say "The uart works in DCE mode".
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NRob Herring <robh@kernel.org>

This adds a DT binding documentation for the MT7623 SoC from Mediatek.
Signed-off-by: NJohn Crispin <blogic@openwrt.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: NMatthias Brugger <matthias.bgg@gmail.com>

Add binding documentation for the bcm2835-aux-uart driver.
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NEric Anholt <eric@anholt.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Simply document new compat strings.
There appears to be no need for a driver updates.
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Amend the DT bindings to include the optional clock sources for the Baud
Rate Generator for External Clock (BRG), as found on some SCIF variants
and on HSCIF.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Amend the DT bindings to include the optional external clock on
(H)SCI(F) and some SCIFA, where this pin can serve as a clock input,
depending on board wiring.

Clarify the use of the divided functional clock as a source for the
sampling clock.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add fallback compatibility strings for R-Car Gen1, Gen2, and Gen3.
This is in keeping with the fallback scheme being adopted wherever
appropriate for drivers for Renesas SoCs.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>

As no platform defines an interface clock the SCI driver always falls
back to a clock named "peripheral_clk".
  - On SH platforms that clock is the base clock for the SCI functional
    clock and has the same frequency,
  - On ARM platforms that clock doesn't exist, and clk_get() will return
    the default clock for the device.
We can thus make the functional clock mandatory and drop the interface
clock.

EPROBE_DEFER is handled for clocks that may be referenced from DT (i.e.
"fck", and the deprecated "sci_ick").

Cc: devicetree@vger.kernel.org
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: NSimon Horman <horms+renesas@verge.net.au>
[geert: Handle EPROBE_DEFER, reformat description, break long comment line]
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

All users of QPACE have upgraded to QPACE2 so remove the Cell QPACE code.
Signed-off-by: NRashmica Gupta <rashmicy@gmail.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

Also replaces "R-Car M2" with "R-Car M2-W" to avoid confusion.
Signed-off-by: NUlrich Hecht <ulrich.hecht+renesas@gmail.com>
Acked-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This adds a DT binding documentation for the MT2701 SoC from Mediatek.
Signed-off-by: NErin Lo <erin.lo@mediatek.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMatthias Brugger <matthias.bgg@gmail.com>

Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NRob Herring <robh@kernel.org>

Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Remove "mrvl,lpss-ssp" property from documentation because LPSS SSP type is
for certain Intel platforms. I believe commit a6e56c28
("ARM: pxa: ssp: add DT bindings") added it by accident by copying all
enum pxa_ssp_type types from include/linux/pxa2xx_ssp.h.

Please note this was removed from arch/arm/plat-pxa/ssp.c by the
commit b692cb83 ("ARM: pxa: ssp: Fix build error by removing originally
incorrect DT binding").
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Add receive DMA support for UARTDM type of controllers.

Tested on APQ8064, which have UARTDM v1.3 and ADM DMA engine
and APQ8016, which have UARTDM v1.4 and BAM DMA engine.
Signed-off-by: NIvan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add transmit DMA support for UARTDM type of controllers.

Tested on APQ8064, which have UARTDM v1.3 and ADM DMA engine
and APQ8016, which have UARTDM v1.4 and BAM DMA engine.
Signed-off-by: NIvan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

If the DW_apb_uart is configured with UART_16550_COMPATIBLE
configuration parameter set, then the Busy Functionality is
not available. These UARTs will never generate the Busy
detect indication interrupt, and therefore don't need
handling for it.

This creates a small optimization for the DW_apb_uarts
configured without the busy functionality, but more
importantly, it removes the small but real risk of hitting
potential issues caused by busy functionality handling when
no busy functionality exist.
Signed-off-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add these variants of the UART as compatible strings
Signed-off-by: NMatt Redfearn <matt.redfearn@imgtec.com>

blah
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

In order to use the mctrl_gpio helpers, we change the DT bindings:
ri-gpios renamed to rng-gpios. cd-gpios renamed to dcd-gpios.
However, no in-tree dts/dtsi specifies these, so no worries.
Signed-off-by: NNiklas Cassel <nks@flawful.org>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Tested-by: NGuenter Roeck <linux@roeck-us.net>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This patch adds a new DT property, "atmel,fifo-size", to enable and set
the maximum number of data the RX and TX FIFOs can store on FIFO capable
USARTs.

Please be aware that the VERSION register can not be used to guess the
size of FIFOs. Indeed, for a given hardware version, the USARTs can be
integrated on Atmel SoCs with different FIFO sizes. Also the
"atmel,fifo-size" property is optional as older USARTs don't embed FIFO at
all.

Besides, the FIFO size can not be read or guessed from other registers:
When designing the FIFO feature, no dedicated registers were added to
store this size. Unsed spaces in the I/O register range are limited and
better reserved for future usages. Instead, the FIFO size of each
peripheral is documented in the programmer datasheet.

Finally, on a given SoC, there can be several instances of USART with
different FIFO sizes. This explain why we'd rather use a dedicated DT
property than use the "compatible" property.
Signed-off-by: NCyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Due to Advisory 21 as documented in AM437x errata document,
UART module cannot be disabled once DMA is used. The only
workaround is to softreset the module before disabling it.

DRA7x UARTs are compatible to AM437x UARTs in terms of
this errata and prescribed workaround.

Enable usage of workaround for this errata on DRA7x SoCs.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Reviewed-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Use of of_machine_is_compatible() for handling AM335x specific
"DMA kick" quirk in 8250_omap driver makes it ugly to extend the
quirk for other platforms. Instead use a new compatible.

The new compatible will also make it easier to take care of
other quirks on AM335x and like SoCs.

In order to not break backward DTB compatibility for users of
8250_omap driver on AM335x based boards, existing use of
of_machine_is_compatible() has not been removed.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Reviewed-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The compatible "ti,am4372-uart" is used in arch/arm/boot/dts/am4372.dtsi
but not documented. Add necessary documentation.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Reviewed-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This adds DT binding documentation for Mediatek MT6795.
Signed-off-by: NMars Cheng <mars.cheng@mediatek.com>
Signed-off-by: NMatthias Brugger <matthias.bgg@gmail.com>

This adds a DT binding documentation for the MT6580 SoC from Mediatek.
Signed-off-by: NMars Cheng <mars.cheng@mediatek.com>
Signed-off-by: NMatthias Brugger <matthias.bgg@gmail.com>

Signed-off-by: NYoshinori Sato <ysato@users.sourceforge.jp>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>

Add binding documentation for the UARTs found in Ingenic SoCs.
Signed-off-by: NPaul Burton <paul.burton@imgtec.com>
Acked-by: NRob Herring <robh@kernel.org>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/10161/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

This is binding information for the UniPhier on-chip UART driver
(drivers/tty/serial/8250/8250_uniphier.c).
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add initial dts file and document for ZX296702 and board ZX296702-AD1.
More peripherals will be added later.
Signed-off-by: NJun Nie <jun.nie@linaro.org>
Signed-off-by: NKevin Hilman <khilman@linaro.org>

Add device tree binding documentation for nxp,lpc1850-uart.
Signed-off-by: NJoachim Eastwood <manabian@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Updated the documentation for spi interface.
Signed-off-by: NRama Kiran Kumar Indrakanti <indrakanti_ram@hotmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The ARM Server Base System Architecture[1] document describes a
generic UART which is a subset of the PL011 UART.
It lacks DMA support, baud rate control and modem status line
control, among other things.
The idea is to move the UART initialization and setup into the
firmware (which does this job today already) and let the kernel just
use the UART for sending and receiving characters.

We use the recent refactoring to build a new struct uart_ops
variable which points to some new functions avoiding access to the
missing registers. We reuse as much existing PL011 code as possible.

In contrast to the PL011 the SBSA UART does not define any AMBA or
PrimeCell relations, so we go with a pretty generic probe function
which only uses platform device functions.
A DT binding is provided with this patch, ACPI support is added in a
separate one.
Signed-off-by: NAndre Przywara <andre.przywara@arm.com>
Tested-by: NMark Langsdorf <mlangsdo@redhat.com>
Tested-by: NNaresh Bhat <nbhat@cavium.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The mtk 8250 needs two clocks, one for providing the baudrate and
one that needs to be enabled for register accesses. The latter has
not been supported, this patch adds support for it. It is optional
for now since not all SoCs provide a bus clock.
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This reverts commit 52bec4ed("serial: sirf: add a new uart type
support").
we misunderstood the clock dependency in atlas7. Actually involved
several clocks are in a tree structure. we still only need to take
the leaf clock node for BT uarts.
Signed-off-by: NQipan Li <Qipan.Li@csr.com>
Signed-off-by: NBarry Song <Barry.Song@csr.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This patchset attempts to standardize the naming of dt-bindings
documents based on the Broadcom vendor prefix of brcm.

Although there are no guidelines currently present for how to name
the dt-bindings document the "vendor,binding.txt" style is in use by
some of the other vendors.
Acked-by: NLee Jones <lee@kernel.org>
Acked-by: NFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: NGregory Fong <gregory.0xf0@gmail.com>
Acked-by: NStephen Warren <swarren@wwwdotorg.org>
Signed-off-by: NScott Branden <sbranden@broadcom.com>
Signed-off-by: NRob Herring <robh@kernel.org>

The omap_serial.txt binding documentation lacks a number of properties
that are used in DTS files for platforms incorporating this peripheral.
Fix this by documenting the missing required and optional fields and
add an example.
Signed-off-by: NMatt Porter <mporter@konsulko.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>