Hi Jean-Michel,
On Friday 13 March 2009 15:20:24 Jean-Michel Hautbois wrote:
> 2009/3/13 Laurent Pinchart <laure...@cse-semaphore.com>:
> > Support for the modem control lines has been added in v2.6.27-rc2. You
> > will need to declare the modem control lines in your device tree. See
> > Documentation/powerpc/dts-bindings/fsl/cpm_qe/serial.txt for more
> > information.
> >
> > Please note that hardware flow control is not supported by the CPM UART
> > driver yet.
>
> OK, this is not easy, to modify...
> My DTS already contains a configuration for the CPM1 port...
>
> ser...@11a00 {
> device_type = "serial";
> compatible = "fsl,mpc8272-scc-uart",
> "fsl,cpm2-scc-uart";
> reg = <0x11a00 0x20 0x8000 0x100>;
> interrupts = <40 8>;
> interrupt-parent = <&PIC>;
> fsl,cpm-brg = <1>;
> fsl,cpm-command = <0x800000>;
> };
>
> ser...@11a60 {
> device_type = "serial";
> compatible = "fsl,mpc8272-scc-uart",
> "fsl,cpm2-scc-uart";
> reg = <0x11a60 0x20 0x8300 0x100>;
> interrupts = <43 8>;
> interrupt-parent = <&PIC>;
> fsl,cpm-brg = <4>;
> fsl,cpm-command = <0xce0000>;
> };
>
> I can't see what I have to do...
> This is not obvious ;).
Here are excerpts of my device tree for an MPC8248 based platform.
You need to declare GPIO controllers for the pins used by modem control lines
cpm2_pio_c: gpio_control...@10d40 {
compatible = "fsl,mpc8248-pario-bank",
"fsl,cpm2-pario-bank";
reg = <0x10d40 0x14>;
#gpio-cells = <2>;
gpio-controller;
};
cpm2_pio_d: gpio_control...@10d60 {
compatible = "fsl,mpc8248-pario-bank",
"fsl,cpm2-pario-bank";
reg = <0x10d60 0x14>;
#gpio-cells = <2>;
gpio-controller;
};
and add the GPIO mapping in your serial port controller nodes
gpios = <&cpm2_pio_c 15 0 /* CTS */
&cpm2_pio_d 29 0 /* RTS */
&cpm2_pio_c 14 0 /* DCD */
0 /* DSR */
&cpm2_pio_d 20 0 /* DTR */
&cpm2_pio_c 8 0 /* RI */
>;
Don't forget to configure the pins (direction, special purpose, ...) in your
board-specific code.
--
Laurent Pinchart
CSE Semaphore Belgium
Waterloo Office Park
Building M
Dreve Richelle, 161
B-1410 Waterloo
Belgium
T +32 (2) 387 42 59
F +32 (2) 387 42 75
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