From: Mark Rutland <mark.rutland@arm.com>
To: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Jason Cooper <jason@lakedaemon.net>, Andrew Lunn <andrew@lunn.ch>,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
arm@kernel.org, Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Jonathan Corbet <corbet@lwn.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
linux-serial@vger.kernel.org, Tejun Heo <tj@kernel.org>,
Hans de Goede <hdegoede@redhat.com>,
linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org,
Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
linux-arm-kernel@lists.infradead.org,
Wilson Ding <dingwei@marvell.com>,
Nadav Haklai <nadavh@marvell.com>
Subject: Re: [PATCH 01/10] serial: mvebu-uart: initial support for Armada-3700 serial port
Date: Tue, 2 Feb 2016 18:28:42 +0000 [thread overview]
Message-ID: <20160202182842.GD29778@leverpostej> (raw)
In-Reply-To: <1454436468-4241-2-git-send-email-gregory.clement@free-electrons.com>
On Tue, Feb 02, 2016 at 07:07:39PM +0100, Gregory CLEMENT wrote:
> From: Wilson Ding <dingwei@marvell.com>
>
> Armada-3700's uart is a simple serial port, which doesn't
> support. Configuring the modem control lines. The uart port has a 32
> bytes Tx FIFO and a 64 bytes Rx FIFO
>
> The uart driver implements the uart core operations. It also support the
> system (early) console based on Armada-3700's serial port.
>
> Known Issue:
>
> The uart driver currently doesn't support clock programming, which means
> the baud-rate stays with the default value configured by the bootloader
> at boot time
To ensure that the bootloader and kernel match, it's best to place the
rate in the stdout-path property (as in
Documentation/devicetree/bindings/chosen.txt).
Presumably that is what you want?
Is it difficutl to add clock programming?
>
> [gregory.clement@free-electrons.com: Rewrite many part which are too long
> to enumerate]
>
> Signed-off-by: Wilson Ding <dingwei@marvell.com>
> Signed-off-by: Nadav Haklai <nadavh@marvell.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
> ---
> .../devicetree/bindings/tty/serial/mvebu-uart.txt | 13 +
> Documentation/kernel-parameters.txt | 6 +
> drivers/tty/serial/Kconfig | 22 +
> drivers/tty/serial/Makefile | 1 +
> drivers/tty/serial/mvebu-uart.c | 649 +++++++++++++++++++++
> include/uapi/linux/serial_core.h | 3 +
> 6 files changed, 694 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/tty/serial/mvebu-uart.txt
> create mode 100644 drivers/tty/serial/mvebu-uart.c
>
> diff --git a/Documentation/devicetree/bindings/tty/serial/mvebu-uart.txt b/Documentation/devicetree/bindings/tty/serial/mvebu-uart.txt
> new file mode 100644
> index 000000000000..6087defd9f93
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/tty/serial/mvebu-uart.txt
> @@ -0,0 +1,13 @@
> +* Marvell UART : Non standard UART used in some of Marvell EBU SoCs (e.g., Armada-3700)
> +
> +Required properties:
> +- compatible: "marvell,armada-3700-uart"
> +- reg: offset and length of the register set for the device.
> +- interrupts: device interrupt
> +
> +Example:
> + serial@12000 {
> + compatible = "marvell,armada-3700-uart";
> + reg = <0x12000 0x400>;
> + interrupts = <43>;
> + };
There are no external clock inputs?
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 87d40a72f6a1..198f6bd56e84 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1058,6 +1058,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> A valid base address must be provided, and the serial
> port must already be setup and configured.
>
> + mvebu_uart,<addr>
> + Start an early, polled-mode console on an some mvebu
> + SoC (as the Armada-3700) serial port at the specified
> + address. The serial port must already be setup and
> + configured. Options are not yet supported.
> +
Does the the mvebu UART vary between platforms at all?
Thanks,
Mark.
next prev parent reply other threads:[~2016-02-02 18:29 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-02 18:07 [PATCH 00/10] Add support for the Armada 3700 SoC an mvebu ARM64 based Gregory CLEMENT
2016-02-02 18:07 ` [PATCH 01/10] serial: mvebu-uart: initial support for Armada-3700 serial port Gregory CLEMENT
2016-02-02 18:19 ` Mark Rutland
2016-02-02 18:21 ` Mark Rutland
2016-02-02 18:19 ` One Thousand Gnomes
2016-02-03 15:58 ` Gregory CLEMENT
2016-02-02 18:28 ` Mark Rutland [this message]
2016-02-03 16:32 ` Gregory CLEMENT
2016-02-03 16:56 ` Gregory CLEMENT
2016-02-03 17:05 ` Mark Rutland
2016-02-02 21:07 ` Arnd Bergmann
2016-02-03 16:36 ` Gregory CLEMENT
2016-02-02 21:19 ` Rob Herring
2016-02-03 8:05 ` Marcin Wojtas
2016-02-03 16:43 ` Gregory CLEMENT
2016-02-02 18:07 ` [PATCH 02/10] ata: ahci_mvebu: add support for Armada 3700 variant Gregory CLEMENT
2016-02-02 18:07 ` [PATCH 03/10] arm64: add Armada 3700 architecture entry Gregory CLEMENT
2016-02-03 6:24 ` Jisheng Zhang
2016-02-03 7:55 ` Gregory CLEMENT
2016-02-03 9:11 ` Arnd Bergmann
2016-02-03 11:13 ` Gregory CLEMENT
2016-02-02 18:07 ` [PATCH 04/10] Documentation: dt-bindings: Add a new compatible for the Armada 3700 Gregory CLEMENT
2016-02-02 21:20 ` Rob Herring
2016-02-02 18:07 ` [PATCH 05/10] Documentation: dt: Tidy up the Marvell related files Gregory CLEMENT
2016-02-02 21:26 ` Rob Herring
2016-02-02 18:07 ` [PATCH 06/10] devicetree: bindings: add DT binding for the Marvell Armada 3700 SoC family Gregory CLEMENT
2016-02-02 21:24 ` Rob Herring
2016-02-03 8:02 ` Gregory CLEMENT
2016-02-02 18:07 ` [PATCH 07/10] arm64: dts: add the Marvell Armada 3700 family and a development board Gregory CLEMENT
2016-02-02 18:34 ` Mark Rutland
2016-02-03 10:44 ` Gregory CLEMENT
2016-02-03 6:37 ` Jisheng Zhang
2016-02-02 18:07 ` [PATCH 08/10] MAINTAINERS: Extend dts entry for ARM64 mvebu files Gregory CLEMENT
2016-02-02 18:07 ` [PATCH 09/10] Documentation: arm: update supported Marvell EBU processors Gregory CLEMENT
2016-02-02 18:07 ` [PATCH 10/10] arm64: defconfig: enable Armada 3700 related config Gregory CLEMENT
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