Dear Maarten,
According to you last answer I have changed in config.txt:
dtparam=i2c_arm=on
In addition to:
# Debug active
dtdebug=1
# Additional overlays and parameters are documented /boot/overlays/README
dtoverlay=sc16is752-i2c,clkrate=100000,irqpin=22
I have changed interrupt configuration to <&gpio>. The sc16is752-i2c-overlay.dts file is (If you cannot read it properly due to email agent - it is supposed to be plain text-, I can send it some other way):
----------------------------------------------------------------------------------
// Overlay for the SC16IS752 I2C-connected UART
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2708";
fragment@0 {
target = <&i2c_arm>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
sc16is752: sc16is752@4D {
compatible = "nxp,sc16is752";
reg = <0x4D>;
clocks = <&sc16is752_clock>;
interrupt-parent = <&gpio>;
interrupts = <255 2>; /* high-to-low edge triggered */
gpio-controller;
#gpio-cells = <2>;
};
};
};
fragment@1 {
target = <&clocks>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
sc16is752_clock: sc16is752_clock@10 {
compatible = "fixed-clock";
reg = <10>;
#clock-cells = <0>;
clock-output-name = "sc16is752";
clock-frequency = <100000>;
};
};
};
fragment@2 {
target = <&gpio>;
__overlay__ {
sc16is752_pins: sc16is752_pins {
brcm,pins = <255>;
brcm,function = <0>; /* in */
};
};
};
__overrides__ {
clkrate = <&sc16is752_clock>,"clock-frequency:0";
irqpin = <&sc16is752>,"interrupts:0",
<&sc16is752_pins>,"brcm,pins:0";
};
};
----------------------------------------------------------------------------------
I use Device Tree. When executing:
"dtc -I fs /proc/device-tree"
I get following output (I only include lines related with sc16is752):
------------------------------------------------------------------------------------
soc {
compatible = "simple-bus";
ranges = <0x7e000000 0x20000000 0x1000000>;
#address-cells = <0x1>;
phandle = <0x1d>;
#size-cells = <0x1>;
linux,phandle = <0x1d>;
...
i2c@7e804000 {
reg = <0x7e804000 0x1000>;
interrupts = <0x2 0x15>;
pinctrl-0 = <0xd>;
compatible = "brcm,bcm2708-i2c";
clock-frequency = <0x186a0>;
clocks = <0x4>;
status = "okay";
#address-cells = <0x1>;
phandle = <0x1a>;
#size-cells = <0x0>;
pinctrl-names = "default";
linux,phandle = <0x1a>;
sc16is752@4D {
reg = <0x4d>;
interrupts = <0x16 0x2>;
#gpio-cells = <0x2>;
compatible = "nxp,sc16is752";
clocks = <0x28>;
phandle = <0x29>;
gpio-controller;
linux,phandle = <0x29>;
interrupt-parent = <0xf>;
};
};
....
gpio@7e200000 {
reg = <0x7e200000 0xb4>;
interrupts = <0x2 0x11 0x2 0x12>;
#gpio-cells = <0x2>;
compatible = "brcm,bcm2835-gpio";
#interrupt-cells = <0x2>;
phandle = <0xf>;
interrupt-controller;
gpio-controller;
linux,phandle = <0xf>;
....
sc16is752_pins {
phandle = <0x2a>;
brcm,function = <0x0>;
brcm,pins = <0x16>;
linux,phandle = <0x2a>;
};
};
};
clocks {
compatible = "simple-bus";
status = "okay";
#address-cells = <0x1>;
phandle = <0x27>;
#size-cells = <0x0>;
linux,phandle = <0x27>;
....
sc16is752_clock@10 {
reg = <0xa>;
#clock-cells = <0x0>;
clock-output-name = "sc16is752";
compatible = "fixed-clock";
clock-frequency = <0x186a0>;
phandle = <0x28>;
linux,phandle = <0x28>;
};
};
-------------------------------------------------------------------
I also include the log generated by command:
"sudo vcdbg log msg" ( without dtdebug=1 ):
----------------------------------------------------------------------------------
012803.616: Loaded overlay 'sc16is752-i2c'
012803.633: dtparam: clkrate=100000
012804.198: dtparam: irqpin=22
012805.091: dtparam: i2c_arm=on
----------------------------------------------------------------------------------
And by command:
"sudo vcdbg log msg" ( with dtdebug=1 ):
----------------------------------------------------------------------------------
012808.179: Loaded overlay 'sc16is752-i2c'
012808.198: dtparam: clkrate=100000
012808.371: dtdebug: Found override clkrate
012808.408: dtdebug: override clkrate: cell target clock-frequency @ offset 0 (size 4)
012808.827: dtparam: irqpin=22
012809.004: dtdebug: Found override irqpin
012809.040: dtdebug: override irqpin: cell target interrupts @ offset 0 (size 4)
012809.289: dtdebug: override irqpin: cell target brcm,pins @ offset 0 (size 4)
012809.851: dtdebug: Found fragment 0 (offset 36)
012813.252: dtdebug: merge_fragment(/soc/i2c@7e804000,/fragment@0/__overlay__)
012813.278: dtdebug: +prop(#address-cells)
012813.656: dtdebug: +prop(#size-cells)
012814.036: dtdebug: +prop(status)
012815.823: dtdebug: merge_fragment(/soc/i2c@7e804000/sc16is752@4D,/fragment@0/__overlay__/sc16is752@4D)
012815.848: dtdebug: +prop(compatible)
012816.204: dtdebug: +prop(reg)
012816.594: dtdebug: +prop(clocks)
012816.989: dtdebug: +prop(interrupt-parent)
012817.366: dtdebug: +prop(interrupts)
012817.787: dtdebug: +prop(gpio-controller)
012818.230: dtdebug: +prop(#gpio-cells)
012818.681: dtdebug: +prop(linux,phandle)
012819.134: dtdebug: +prop(phandle)
012819.597: dtdebug: merge_fragment() end
012819.631: dtdebug: merge_fragment() end
012819.705: dtdebug: Found fragment 1 (offset 324)
012824.304: dtdebug: merge_fragment(/clocks,/fragment@1/__overlay__)
012824.329: dtdebug: +prop(#address-cells)
012824.598: dtdebug: +prop(#size-cells)
012824.872: dtdebug: +prop(status)
012827.205: dtdebug: merge_fragment(/clocks/sc16is752_clock@10,/fragment@1/__overlay__/sc16is752_clock@10)
012827.230: dtdebug: +prop(compatible)
012827.508: dtdebug: +prop(reg)
012827.820: dtdebug: +prop(#clock-cells)
012828.225: dtdebug: +prop(clock-output-name)
012828.703: dtdebug: +prop(clock-frequency)
012829.110: dtdebug: +prop(linux,phandle)
012829.478: dtdebug: +prop(phandle)
012829.847: dtdebug: merge_fragment() end
012829.881: dtdebug: merge_fragment() end
012829.957: dtdebug: Found fragment 2 (offset 588)
012831.658: dtdebug: merge_fragment(/soc/gpio@7e200000,/fragment@2/__overlay__)
012833.036: dtdebug: merge_fragment(/soc/gpio@7e200000/sc16is752_pins,/fragment@2/__overlay__/sc16is752_pins)
012833.060: dtdebug: +prop(brcm,pins)
012833.651: dtdebug: +prop(brcm,function)
012834.249: dtdebug: +prop(linux,phandle)
012834.832: dtdebug: +prop(phandle)
012835.429: dtdebug: merge_fragment() end
012835.458: dtdebug: merge_fragment() end
012835.626: dtparam: cache_line_size=32
012836.835: dtdebug: Found override cache_line_size
012836.874: dtdebug: override cache_line_size: cell target cache-line-size @ offset 0 (size 4)
012839.921: dtdebug: delete_node(/hat)
----------------------------------------------------------------------------------
We are still missing the ttySC0 and ttySC1 in /dev folder. Somehow the sc16is752 is not correctly recognized.
I am using kernel version 4.1.13. Should I use 4.4?
Any other suggestion?.
Thanks for your support.
Juan.
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