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From: Chuanhua Han <chuanhua.han@nxp.com>
To: robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org,
	s.hauer@pengutronix.de, leoyang.li@nxp.com
Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org,
	kernel@pengutronix.de, linux-imx@nxp.com, festevam@gmail.com,
	wsa+renesas@sang-engineering.com, u.kleine-koenig@pengutronix.de,
	eha@deif.com, linux@rempel-privat.de, sumit.batra@nxp.com,
	l.stach@pengutronix.de, peda@axentia.se,
	Chuanhua Han <chuanhua.han@nxp.com>
Subject: [PATCH 1/3] dt-bindings: i2c: add optional mul-value property to binding
Date: Tue, 30 Apr 2019 12:32:40 +0800	[thread overview]
Message-ID: <20190430043242.29687-1-chuanhua.han@nxp.com> (raw)

NXP Layerscape SoC have up to three MUL options available for all
divider values, we choice of MUL determines the internal monitor rate
of the I2C bus (SCL and SDA signals):
A lower MUL value results in a higher sampling rate of the I2C signals.
A higher MUL value results in a lower sampling rate of the I2C signals.

So in Optional properties we added our custom mul-value property in the
binding to select which mul option for the device tree i2c controller
node.

Signed-off-by: Chuanhua Han <chuanhua.han@nxp.com>
---
 Documentation/devicetree/bindings/i2c/i2c-imx.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-imx.txt b/Documentation/devicetree/bindings/i2c/i2c-imx.txt
index b967544590e8..ba8e7b7b3fa8 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-imx.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-imx.txt
@@ -18,6 +18,9 @@ Optional properties:
 - sda-gpios: specify the gpio related to SDA pin
 - pinctrl: add extra pinctrl to configure i2c pins to gpio function for i2c
   bus recovery, call it "gpio" state
+- mul-value: NXP Layerscape SoC have up to three MUL options available for
+all I2C divider values, it describes which MUL we choose to use for the driver,
+the values should be 1,2,4.
 
 Examples:
 
-- 
2.17.1


             reply	other threads:[~2019-04-30  4:31 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-30  4:32 Chuanhua Han [this message]
2019-04-30  4:32 ` [PATCH 2/3] i2c: imx: I2C Driver IBC and SCL Divider for MUL=2 and MUL=4 Chuanhua Han
2019-04-30  4:32 ` [PATCH 3/3] arm64: dts: fsl: ls1046a: Add mul-value property of the i2c controller nodes Chuanhua Han
2019-04-30  6:38 ` [PATCH 1/3] dt-bindings: i2c: add optional mul-value property to binding Uwe Kleine-König
2019-04-30  6:56   ` [EXT] " Chuanhua Han
2019-05-02 20:59 ` Rob Herring
2019-05-07  8:40   ` Wolfram Sang
2019-05-08 11:44   ` [EXT] " Chuanhua Han
2019-05-08 18:53     ` Leo Li

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