From: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
To: linux-arm-kernel@lists.infradead.org
Cc: wsa@the-dreams.de, robh+dt@kernel.org, robert.jarzmik@free.fr,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-i2c@vger.kernel.org,
Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Subject: [PATCH-v5 RESEND 4/5] Documentation: binding: add sclk adjustment properties to i2c-pxa
Date: Mon, 24 Aug 2015 11:29:37 +0530 [thread overview]
Message-ID: <1440395978-9065-5-git-send-email-vaibhav.hiremath@linaro.org> (raw)
In-Reply-To: <1440395978-9065-1-git-send-email-vaibhav.hiremath@linaro.org>
With addition of PXA910 family of devices, the TWSI module supports
new feature which allows us to adjust SCLK. i2c-pxa driver takes input
configuration in nsec and converts it to respective bit-fields,
- i2c-sclk-low-time-ns : SCLK low time (tlow)
This property is used along with mode selection.
- i2c-sclk-high-time-ns : SCLK high time (thigh)
- i2c-start-hold-time-ns : Used in case of high speed mode for start bit
hold/setup wait counter.
- i2c-stop-hold-time-ns : Used in case of high speed mode for stop bit
hold/setup wait counter.
- i2c-sda-hold-time-ns : Used to calculate hold/setup wait counter for
standard and fast mode.
Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
---
Documentation/devicetree/bindings/i2c/i2c-pxa.txt | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-pxa.txt b/Documentation/devicetree/bindings/i2c/i2c-pxa.txt
index 9657db5..bb4df60 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-pxa.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-pxa.txt
@@ -23,12 +23,25 @@ Optional properties :
- i2c-disable-after-xfer : If set, driver will disable I2C module
after msg xfer and enable it again before xfer.
+ (Applicable to PXA910 family):
+
+ - i2c-sclk-low-time-ns : SCLK low time (tlow), for standard/fast/high
+ speed mode.
+ This property is used along with mode selection. Driver uses this property
+ to set low/high time for standard and fast speed mode, as HW counter
+ bit-field is same for both.
+ - i2c-sclk-high-time-ns : SCLK high time (thigh), Used in case of high speed
+ mode only.
+
Examples:
twsi1: i2c@d4011000 {
compatible = "mrvl,mmp-twsi";
reg = <0xd4011000 0x1000>;
interrupts = <7>;
mrvl,i2c-fast-mode;
+
+ i2c-sclk-low-time-ns = <988>;
+ i2c-sclk-high-time-ns = <988>;
};
twsi2: i2c@d4025000 {
--
1.9.1
next prev parent reply other threads:[~2015-08-24 6:02 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-24 5:59 [PATCH-v5 RESEND 0/5] i2c: pxa: Add support for PXA910 family of device Vaibhav Hiremath
2015-08-24 5:59 ` [PATCH-v5 RESEND 1/5] Documentation: binding: add new property 'disable_after_xfer' to i2c-pxa Vaibhav Hiremath
2015-08-24 5:59 ` [PATCH-v5 RESEND 2/5] i2c: pxa: enable/disable i2c module across msg xfer Vaibhav Hiremath
2015-09-11 18:53 ` Wolfram Sang
2015-09-14 5:07 ` Vaibhav Hiremath
2015-10-25 8:21 ` Wolfram Sang
2015-08-24 5:59 ` [PATCH-v5 RESEND 3/5] i2c: pxa: Add support for pxa910/988 & new configuration features Vaibhav Hiremath
2015-09-11 19:06 ` Wolfram Sang
2015-09-14 5:28 ` Vaibhav Hiremath
2015-10-25 8:40 ` Wolfram Sang
2015-10-25 8:25 ` Wolfram Sang
2015-08-24 5:59 ` Vaibhav Hiremath [this message]
2015-10-25 8:37 ` [PATCH-v5 RESEND 4/5] Documentation: binding: add sclk adjustment properties to i2c-pxa Wolfram Sang
2015-08-24 5:59 ` [PATCH-v5 RESEND 5/5] i2c: pxa: Add ILCR (tLow & tHigh) configuration support Vaibhav Hiremath
2015-09-02 6:47 ` [PATCH-v5 RESEND 0/5] i2c: pxa: Add support for PXA910 family of device Vaibhav Hiremath
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