On Tue, Jul 21, 2015 at 06:11:05PM +0530, Vaibhav Hiremath wrote:
> 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.
Again, these should have a mrvl prefix..very specific to this PXA
controller.
-Matt
> Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@xxxxxxxxxx>
> ---
> 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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