From: Tudor Ambarus <tudor.ambarus@microchip.com>
To: <broonie@kernel.org>, <robh+dt@kernel.org>,
<krzysztof.kozlowski+dt@linaro.org>,
<nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
<claudiu.beznea@microchip.com>
Cc: <linux-spi@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mtd@lists.infradead.org>,
Tudor Ambarus <tudor.ambarus@microchip.com>
Subject: [PATCH 1/8] spi: dt-bindings: Introduce spi-cs-setup-ns property
Date: Thu, 17 Nov 2022 12:52:42 +0200 [thread overview]
Message-ID: <20221117105249.115649-2-tudor.ambarus@microchip.com> (raw)
In-Reply-To: <20221117105249.115649-1-tudor.ambarus@microchip.com>
SPI NOR flashes have specific cs-setup time requirements without which
they can't work at frequencies close to their maximum supported frequency,
as they miss the first bits of the instruction command. Unrecognized
commands are ignored, thus the flash will be unresponsive. Introduce the
spi-cs-setup-ns property to allow spi devices to specify their cs setup
time.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
.../devicetree/bindings/spi/spi-peripheral-props.yaml | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
index dca677f9e1b9..ead2cccf658f 100644
--- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
@@ -44,6 +44,11 @@ properties:
description:
Maximum SPI clocking speed of the device in Hz.
+ spi-cs-setup-ns:
+ description:
+ Delay in nanosecods to be introduced by the controller after CS is
+ asserted.
+
spi-rx-bus-width:
description:
Bus width to the SPI bus used for read transfers.
--
2.25.1
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next prev parent reply other threads:[~2022-11-17 10:59 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-17 10:52 [PATCH 0/8] spi: Introduce spi-cs-setup-ns dt property Tudor Ambarus
2022-11-17 10:52 ` Tudor Ambarus [this message]
2022-11-18 14:14 ` [PATCH 1/8] spi: dt-bindings: Introduce spi-cs-setup-ns property Michael Walle
2022-11-18 15:30 ` Mark Brown
2023-01-02 9:37 ` Tudor Ambarus
2023-01-02 11:48 ` Michael Walle
2023-01-02 12:11 ` Tudor Ambarus
2023-01-02 13:21 ` Michael Walle
2022-11-17 10:52 ` [PATCH 2/8] spi: " Tudor Ambarus
2022-11-17 10:52 ` [PATCH 3/8] spi: Reintroduce spi_set_cs_timing() Tudor Ambarus
2022-11-17 10:52 ` [PATCH 4/8] spi: atmel-quadspi: Add support for configuring CS timing Tudor Ambarus
2022-11-17 10:52 ` [PATCH 5/8] ARM: dts: at91-sama5d27_wlsom1: Set sst26vf064b SPI NOR flash at its maximum frequency Tudor Ambarus
2023-03-28 8:51 ` Nicolas Ferre
2023-03-28 9:36 ` Tudor Ambarus
2022-11-17 10:52 ` [PATCH 6/8] ARM: dts: at91-sama5d27_som1: " Tudor Ambarus
2022-11-17 10:52 ` [PATCH 7/8] ARM: dts: at91: sama5d2_icp: " Tudor Ambarus
2022-11-17 10:52 ` [PATCH 8/8] ARM: dts: at91: sam9x60ek: " Tudor Ambarus
2022-11-18 14:04 ` (subset) [PATCH 0/8] spi: Introduce spi-cs-setup-ns dt property Mark Brown
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