From: Lubomir Rintel <lkundrak@v3.sk>
To: Andy Shevchenko <andy@infradead.org>, Darren Hart <dvhart@infradead.org>
Cc: Rob Herring <robh+dt@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Mark Rutland <mark.rutland@arm.com>,
platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org,
Sebastian Reichel <sebastian.reichel@collabora.com>,
Lubomir Rintel <lkundrak@v3.sk>, Pavel Machek <pavel@ucw.cz>,
Rob Herring <robh@kernel.org>
Subject: [PATCH v7 01/10] dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC bindings
Date: Mon, 13 May 2019 09:56:32 +0200 [thread overview]
Message-ID: <20190513075641.1277716-2-lkundrak@v3.sk> (raw)
In-Reply-To: <20190513075641.1277716-1-lkundrak@v3.sk>
The OLPC XO-1.75 Embedded Controller is a SPI master that uses extra
signals for handshaking. It needs to know when is the slave (Linux)
side's TX FIFO ready for transfer (the ready-gpio signal on the SPI
controller node) and when does it wish to respond with a command (the
cmd-gpio property).
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Rob Herring <robh@kernel.org>
---
Changes since v5:
- Added Rob Herring's Reviewed-by tag
Changes since v1:
- s/cmd-gpio/cmd-gpios/
- s/ready-gpio/ready-gpios/ in the documentation paragraph
- Remove status = "okay" from the example
.../bindings/misc/olpc,xo1.75-ec.txt | 23 +++++++++++++++++++
1 file changed, 23 insertions(+)
create mode 100644 Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt
diff --git a/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt
new file mode 100644
index 000000000000..8c4d649cdd8f
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt
@@ -0,0 +1,23 @@
+OLPC XO-1.75 Embedded Controller
+
+Required properties:
+- compatible: Should be "olpc,xo1.75-ec".
+- cmd-gpios: gpio specifier of the CMD pin
+
+The embedded controller requires the SPI controller driver to signal readiness
+to receive a transfer (that is, when TX FIFO contains the response data) by
+strobing the ACK pin with the ready signal. See the "ready-gpios" property of the
+SSP binding as documented in:
+<Documentation/devicetree/bindings/spi/spi-pxa2xx.txt>.
+
+Example:
+ &ssp3 {
+ spi-slave;
+ ready-gpios = <&gpio 125 GPIO_ACTIVE_HIGH>;
+
+ slave {
+ compatible = "olpc,xo1.75-ec";
+ spi-cpha;
+ cmd-gpios = <&gpio 155 GPIO_ACTIVE_HIGH>;
+ };
+ };
--
2.21.0
next prev parent reply other threads:[~2019-05-13 7:57 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-13 7:56 [PATCH v7 00/10] Add support for OLPC XO 1.75 Embedded Controller Lubomir Rintel
2019-05-13 7:56 ` Lubomir Rintel [this message]
2019-05-13 9:07 ` [PATCH v7 01/10] dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC bindings Pavel Machek
2019-05-13 13:18 ` Lubomir Rintel
2019-05-24 16:29 ` Andy Shevchenko
2019-08-01 19:27 ` OLPC in 5.3? was " Pavel Machek
2019-08-02 10:39 ` Lubomir Rintel
2019-08-03 8:47 ` Pavel Machek
2019-08-05 10:26 ` Lubomir Rintel
2019-08-07 12:31 ` Pavel Machek
2019-08-07 12:41 ` Lubomir Rintel
2019-05-13 7:56 ` [PATCH v7 02/10] Platform: OLPC: Remove an unused include Lubomir Rintel
2019-05-13 7:56 ` [PATCH v7 03/10] Platform: OLPC: Move EC-specific functionality out from x86 Lubomir Rintel
2019-05-13 7:56 ` [PATCH v7 04/10] Platform: OLPC: Avoid a warning if the EC didn't register yet Lubomir Rintel
2019-05-13 7:56 ` [PATCH v7 05/10] Platform: OLPC: Use BIT() and GENMASK() for event masks Lubomir Rintel
2019-05-13 7:56 ` [PATCH v7 06/10] Platform: OLPC: Add XO-1.75 EC driver Lubomir Rintel
2019-05-13 7:56 ` [PATCH v7 07/10] Platform: OLPC: Add a regulator for the DCON Lubomir Rintel
2019-05-13 7:56 ` [PATCH v7 08/10] power: supply: olpc_battery: Allow building the driver on non-x86 Lubomir Rintel
2019-05-13 7:56 ` [PATCH v7 09/10] ARM: export arm_pm_restart Lubomir Rintel
2019-05-13 7:56 ` [PATCH v7 10/10] Platform: OLPC: Add restart support to XO-1.75 EC driver Lubomir Rintel
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