From: Rob Herring <robh@kernel.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Joel Stanley <joel@jms.id.au>,
linux-aspeed@lists.ozlabs.org, openbmc@lists.ozlabs.org,
devicetree@vger.kernel.org, Andrew Jeffery <andrew@aj.id.au>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 11/14] dt-bindings: fsi: Document binding for the fsi-master-ast-cf "device"
Date: Tue, 3 Jul 2018 16:30:46 -0600 [thread overview]
Message-ID: <20180703223046.GA20184@rob-hp-laptop> (raw)
In-Reply-To: <20180626232605.13420-12-benh@kernel.crashing.org>
On Wed, Jun 27, 2018 at 09:26:02AM +1000, Benjamin Herrenschmidt wrote:
> This isn't per-se a real device, it's a pseudo-device that
> represents the use of the Aspeed built-in ColdFire to
> implement the FSI protocol by bitbanging the GPIOs instead
> of doing it from the ARM core.
>
> Thus it's a drop-in replacement for the existing
> fsi-master-gpio pseudo-device for use on systems for which
> a corresponding firmware file exists. It has most of the
> same properties, plus some more needed to operate the
> coprocessor.
>
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> ---
> .../bindings/fsi/fsi-master-ast-cf.txt | 36 +++++++++++++++++++
> 1 file changed, 36 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/fsi/fsi-master-ast-cf.txt
>
> diff --git a/Documentation/devicetree/bindings/fsi/fsi-master-ast-cf.txt b/Documentation/devicetree/bindings/fsi/fsi-master-ast-cf.txt
> new file mode 100644
> index 000000000000..50913ae685cc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fsi/fsi-master-ast-cf.txt
> @@ -0,0 +1,36 @@
> +Device-tree bindings for ColdFire offloaded gpio-based FSI master driver
> +------------------------------------------------------------------------
> +
> +Required properties:
> + - compatible =
> + "fsi-master-ast-2400-cf" for an AST2400 based system
> + or
> + "fsi-master-ast-2500-cf" for an AST2500 based system
<vendor>,<soc>-<block>
> +
> + - clock-gpios = <gpio-descriptor>; : GPIO for FSI clock
> + - data-gpios = <gpio-descriptor>; : GPIO for FSI data signal
> + - enable-gpios = <gpio-descriptor>; : GPIO for enable signal
> + - trans-gpios = <gpio-descriptor>; : GPIO for voltage translator enable
> + - mux-gpios = <gpio-descriptor>; : GPIO for pin multiplexing with other
So the gpio info is pased to the CF? Otherwise, what's the point of
having these in DT?
> + functions (eg, external FSI masters)
> + - memory-region = <phandle>; : Reference to the reserved memory for
> + the ColdFire. Must be 2M aligned on
> + AST2400 and 1M aligned on AST2500
> + - sram = <phandle>; : Reference to the SRAM node.
> + - cvic = <phandle>; : Reference to the CVIC node.
Vendor prefixes.
> + - fw-name = <string>; : The name used to construct the firmware
> + file name (cf-fsi-<name>.bin)
firmware-name is used in some other places (and is the full filename).
> + - fw-platform-sig = <value>; : A signature value that must match the one
> + contained in the firmware image. Known
> + values are listed in the firmware interface
> + file cf-fsi-fw.h
Vendor prefix unless you think this could be common.
> +Examples:
> +
> + fsi-master {
> + compatible = "fsi-master-gpio", "fsi-master";
Forget to update the example?
> + clock-gpios = <&gpio 0>;
> + data-gpios = <&gpio 1>;
> + enable-gpios = <&gpio 2>;
> + trans-gpios = <&gpio 3>;
> + mux-gpios = <&gpio 4>;
> + }
> --
> 2.17.1
>
> --
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next prev parent reply other threads:[~2018-07-03 22:30 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-26 23:25 [PATCH 00/14] fsi: Fixes and Coldfire coprocessor offload Benjamin Herrenschmidt
2018-06-26 23:25 ` [PATCH 01/14] devres: Add devm_of_iomap() Benjamin Herrenschmidt
2018-06-26 23:25 ` [PATCH 02/14] fsi: Move code around to avoid forward declaration Benjamin Herrenschmidt
2018-06-26 23:25 ` [PATCH 03/14] fsi: Add mechanism to set the tSendDelay and tEchoDelay values Benjamin Herrenschmidt
2018-06-28 4:10 ` Joel Stanley
2018-06-26 23:25 ` [PATCH 04/14] fsi: master-gpio: Rename and adjust send delay Benjamin Herrenschmidt
2018-06-26 23:25 ` [PATCH 05/14] fsi: master-gpio: Add support for link_config Benjamin Herrenschmidt
2018-06-28 4:11 ` Joel Stanley
2018-06-26 23:25 ` [PATCH 06/14] fsi: master-gpio: Add more tracepoints Benjamin Herrenschmidt
2018-06-28 4:11 ` Joel Stanley
2018-07-12 2:01 ` Benjamin Herrenschmidt
2018-06-26 23:25 ` [PATCH 07/14] fsi: master-gpio: Remove unused definitions Benjamin Herrenschmidt
2018-06-28 4:11 ` Joel Stanley
2018-06-26 23:25 ` [PATCH 08/14] fsi: master-gpio: Remove "GPIO" prefix on some definitions Benjamin Herrenschmidt
2018-06-28 4:11 ` Joel Stanley
2018-06-26 23:26 ` [PATCH 09/14] fsi: master-gpio: Add missing release function Benjamin Herrenschmidt
2018-06-28 4:12 ` Joel Stanley
2018-06-26 23:26 ` [PATCH 10/14] fsi: Move various master definitions to a common header Benjamin Herrenschmidt
2018-06-28 4:12 ` Joel Stanley
2018-06-26 23:26 ` [PATCH 11/14] dt-bindings: fsi: Document binding for the fsi-master-ast-cf "device" Benjamin Herrenschmidt
2018-06-28 4:12 ` Joel Stanley
2018-07-03 22:30 ` Rob Herring [this message]
2018-07-04 1:16 ` Benjamin Herrenschmidt
2018-07-05 16:08 ` Rob Herring
2018-07-07 1:50 ` Benjamin Herrenschmidt
2018-06-26 23:26 ` [PATCH 12/14] fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire Benjamin Herrenschmidt
2018-06-28 5:03 ` Joel Stanley
2018-06-26 23:26 ` [PATCH 13/14] arm: dts: OpenPower Romulus system can use coprocessor for FSI Benjamin Herrenschmidt
2018-06-28 4:12 ` Joel Stanley
2018-06-26 23:26 ` [PATCH 14/14] arm: dts: OpenPower Palmetto " Benjamin Herrenschmidt
2018-06-28 4:13 ` Joel Stanley
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