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Altera_Forum's avatar
Altera_Forum
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12 years ago

Getting data from a rtc device through I2C

Hi all, I would like to retrieve information from a RTC device which is directly connected to a GPIO, using the i2c protocol. So, the first step was to load the i2c-gpio driver with this piece ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

You won't need the bus driver. Please check the gpio and rtc devicetree nodes, which I used in my NEEK extension design.

gpio_0: gpio@0x1500 {

compatible = "opencores,bit-gpio-2.0","opencores,bit-gpio-rtlsvn2";

reg = < 0x1500 0x10>;

bidir-width = <8>;

input-width = <4>;

# gpio-cells = <2>;

gpio-controller;

}; //end gpio (gpio_0)

i2crtc {

# address-cells = <1>;

# size-cells = <0>;

compatible = "i2c-gpio";

gpios = <&gpio_0 7 0

&gpio_0 6 0>;

scl-is-output-only;

rtc@68 {

compatible = "ds1307";

reg = <0x68>;

};

};