From: apronin@chromium.org
To: Mark Brown <broonie@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
Andrey Pronin <apronin@chromium.org>
Subject: [PATCH 4/4] spi: Document option to insert delay between transactions
Date: Wed, 29 Jun 2016 20:54:27 -0700 [thread overview]
Message-ID: <1467258867-117727-4-git-send-email-apronin@chromium.org> (raw)
In-Reply-To: <1467258867-117727-1-git-send-email-apronin@chromium.org>
From: Andrey Pronin <apronin@chromium.org>
Some devices may need CS to be deasserted for some time
between transactions. Added a new capability to guarantee
a delay between SPI transactions for the device.
Signed-off-by: Andrey Pronin <apronin@chromium.org>
---
Documentation/devicetree/bindings/spi/spi-bus.txt | 2 ++
1 file changed, 2 insertions(+)
diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt
index 1b7ffd4..87c117a 100644
--- a/Documentation/devicetree/bindings/spi/spi-bus.txt
+++ b/Documentation/devicetree/bindings/spi/spi-bus.txt
@@ -70,6 +70,8 @@ contain the following properties.
sleep if there was no SPI activity (msec).
- cs-wake-duration - (optional) Time it takes the device to wake up after
toggling CS if it went to sleep (msec).
+- xfer-delay - (optional) Delay to insert between SPI transactions
+ to guarantee that CS is deasserted at least for some time.
Some SPI controllers and devices support Dual and Quad SPI transfer mode.
It allows data in the SPI system to be transferred in 2 wires(DUAL) or 4 wires(QUAD).
--
2.6.6
next prev parent reply other threads:[~2016-06-30 3:54 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-30 3:54 [PATCH 1/4] spi: Add option to wake a device by toggling CS apronin-F7+t8E8rja9g9hUCZPvPmw
2016-06-30 3:54 ` [PATCH 2/4] spi: Document " apronin
2016-06-30 7:12 ` Geert Uytterhoeven
[not found] ` <CAMuHMdXCeFMXPczi3b=GpUEzUJiz0+sK_299GY8o-iYgP8G9iA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-01 4:32 ` Doug Anderson
2016-06-30 3:54 ` [PATCH 3/4] spi: Add option to insert delay between transactions apronin
[not found] ` <1467258867-117727-3-git-send-email-apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2016-07-01 4:44 ` Doug Anderson
2016-07-01 8:16 ` Mark Brown
2016-06-30 3:54 ` apronin [this message]
[not found] ` <1467258867-117727-4-git-send-email-apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2016-06-30 7:12 ` [PATCH 4/4] spi: Document " Geert Uytterhoeven
[not found] ` <CAMuHMdUBcDUoMok9tkxJzGekkLWA=bya0zHXWqHbGp0BGmeZUg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-01 4:45 ` Doug Anderson
[not found] ` <1467258867-117727-1-git-send-email-apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2016-07-01 4:23 ` [PATCH 1/4] spi: Add option to wake a device by toggling CS Doug Anderson
2016-07-01 8:21 ` Mark Brown
[not found] ` <20160701082101.GD6247-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-07-01 17:05 ` Doug Anderson
[not found] ` <CAD=FV=W8gt+xgsJ5pPz1uCXGubDHkOnXoDz0mq--cDvkdf-j9g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-01 17:17 ` Mark Brown
2016-07-02 2:02 ` Andrey Pronin
2016-07-01 8:02 ` Mark Brown
[not found] ` <20160701080230.GB6247-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-07-02 1:45 ` Andrey Pronin
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