Messages in this thread Patch in this message | | | From | Vaibhav Hiremath <> | Subject | [PATCH-v5 4/5] Documentation: binding: add sclk adjustment properties to i2c-pxa | Date | Tue, 21 Jul 2015 18:11:05 +0530 |
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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
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