Thank you Mark for the changes to add bus frequency control to the i2c
driver. I tested your changes (with the addition of logging of the
frequency).
Before changing the dtb (no clock-frequency entry):
sxidog0 at simplebus0
com0 at simplebus0: ns16550, no working fifo
com0: console
sxitwi0 at simplebus0: clock frequency 100000.
iic0 at sxitwi0
bme0 at iic0 addr 0x77: BME280 60
sxitwi1 at simplebus0: clock frequency 100000.
iic1 at sxitwi1
bme1 at iic1 addr 0x76: BME280 60
ampintc0 at simplebus0 nirq 160, ncpu 4
sxirtc0 at simplebus0
Then I added a frequency of 50kHz to i2c-0 and 200kHz to i2c-1:
i2c@1c2ac00 {
compatible = "allwinner,sun6i-a31-i2c";
reg = <0x1c2ac00 0x400>;
interrupts = <0x0 0x6 0x4>;
clocks = <0x2 0x3b>;
resets = <0x2 0x2e>;
pinctrl-names = "default";
pinctrl-0 = <0x16>;
status = "okay";
#address-cells = <0x1>;
#size-cells = <0x0>;
clock-frequency = <0x0000c350>;
bme@0 {
reg = <0x77>;
interrupts = <0x0>;
compatible = "bosch,bme280";
};
};
i2c@1c2b000 {
compatible = "allwinner,sun6i-a31-i2c";
reg = <0x1c2b000 0x400>;
interrupts = <0x0 0x7 0x4>;
clocks = <0x2 0x3c>;
resets = <0x2 0x2f>;
pinctrl-names = "default";
pinctrl-0 = <0x17>;
status = "okay";
#address-cells = <0x1>;
#size-cells = <0x0>;
clock-frequency = <0x00030d40>;
bme@1 {
reg = <0x76>;
interrupts = <0x0>;
compatible = "bosch,bme280";
};
};
com0: console
sxitwi0 at simplebus0: clock frequency 50000.
iic0 at sxitwi0
bme0 at iic0 addr 0x77: BME280 60
sxitwi1 at simplebus0: clock frequency 200000.
iic1 at sxitwi1
bme1 at iic1 addr 0x76: BME280 60
ampintc0 at simplebus0 nirq 160, ncpu 4
sxirtc0 at simplebus0
I checked the 50 and 200 kHz with a scope on the clock lines.
