Hello,
Below is my question to Jon Ringle, the initial author of the sc16is7xx
driver. He pointed me to the mailing list and the authors of the spi
patches.
Can anyone please provide some help?
Off-topic rant: I had to install and configure a different email client
just because the mailing list bounces any mail with an HTML attachment,
even though my message was sent in plain text as well. (I cannot not
disable HTML output in my normal email client.) Not very user friendly
if you ask me. The server could also just throw away the HTML content
instead of bouncing.
Kind regards,
Maarten Brock
--
Van Mierlo Ingenieursbureau BV
Postbus 6466 5600HL Eindhoven Nederland
tel 040-2969999 fax 040-2969990 www.vanmierlo.com
Van: Maarten Brock <m.brock@xxxxxxxxxxxxx>
Aan: Jon Ringle <jringle@xxxxxxxxxxxxx>
Verzonden: 16-10-2015 17:14
Onderwerp: Trouble loading sc16is7xx driver
Hello Jon,
I have a problem getting the sc16is7xx.c driver to load.
I have a Raspberry Pi B+ v1.2 and a board with an
sc16is740 on it connected to the spi0 lines.
I have compiled the 4.2.y kernel for the raspberry pi
with devicetree support. I have compiled the sc16is7xx
driver as a module. And I have created a devicetree
overlay.
I can see my overlay in the actual devicetree. But I get
the following error during boot:
Oct 16 14:52:02 vmipi kernel: [ 9.201766] spi_master
spi0: Failed to create SPI device
for /soc/spi@7e204000/sc16is740@0
And when I use modprobe spi:sc16is7xx it loads and shows
in lsmod, but I still don't get any /dev/ttySCxx device.
Module Size Used by
sc16is7xx 13124 0
regmap_spi 2411 1 sc16is7xx
regmap_i2c 3454 1 sc16is7xx
Here's my dts overlay:
// Definitions for SC16IS740 UART
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2708";
fragment@0 {
target = <&spi0>;
__overlay__ {
status = "okay";
spidev@0 {
status = "disabled";
};
sc16is740: sc16is740@0 {
compatible = "nxp,sc16is740";
reg = <0>;
clocks = <&clk1M8>;
interrupt-parent = <&gpio>;
interrupts = <25 2>; /*
IRQ_TYPE_EDGE_FALLING */
#gpio-controller;
#gpio-cells = <2>;
#spi-max-frequency = <4000000>;
clk1M8: clk1M8 {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <1843200>;
};
};
};
};
};
I've added the spidev@0 status="disabled" in the hope to
resolve a conflict, but it did not help.
Can you provide any help? If you need any more
information, just ask. And if this question is better
asked in a public forum, please advise where.
Kind regards,
Maarten Brock
--
Van Mierlo Ingenieursbureau BV
Postbus 6466 5600HL Eindhoven Nederland
tel 040-2969999 fax 040-2969990 www.vanmierlo.com
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