| Message ID | 1391439428-3198-1-git-send-email-lars@metafoo.de |
|---|---|
| State | Superseded, archived |
| Headers | show |
On Mon, Feb 3, 2014 at 3:57 PM, Lars-Peter Clausen <lars@metafoo.de> wrote: > + - adi,micbias: Configures the voltage setting for the MICBIAS pin. If not > + specified the default value will be 8.5 Volts. This property is only valid > + for the ADAU1977. > + Valid values for this property are: > + 0: 5.0V > + 1: 5.5V > + 2: 6.0V > + 3: 6.5V > + 4: 7.0V > + 5: 7.5V > + 6: 8.0V > + 7: 8.5V > + 8: 9.0V This means the casual DTS reader need to know about the meaning of the values. You can avoid that by: 1. Using preprocessor defines. Drawback is that you have to add an include file. 2. Using mV, and specify minimum, maximum, and incrementals in the bindings, cfr. Documentation/devicetree/bindings/power_supply/ti,bq24735.txt Drawback is that the user can easily specify invalid values. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 02/03/2014 04:15 PM, Geert Uytterhoeven wrote: > On Mon, Feb 3, 2014 at 3:57 PM, Lars-Peter Clausen <lars@metafoo.de> wrote: >> + - adi,micbias: Configures the voltage setting for the MICBIAS pin. If not >> + specified the default value will be 8.5 Volts. This property is only valid >> + for the ADAU1977. >> + Valid values for this property are: >> + 0: 5.0V >> + 1: 5.5V >> + 2: 6.0V >> + 3: 6.5V >> + 4: 7.0V >> + 5: 7.5V >> + 6: 8.0V >> + 7: 8.5V >> + 8: 9.0V > > This means the casual DTS reader need to know about the meaning of > the values. You can avoid that by: > 1. Using preprocessor defines. Drawback is that you have to add an > include file. > 2. Using mV, and specify minimum, maximum, and incrementals in the > bindings, cfr. > Documentation/devicetree/bindings/power_supply/ti,bq24735.txt > Drawback is that the user can easily specify invalid values. Is there a preference for either of them? Thanks, - Lars -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/sound/adi,adau1977.txt b/Documentation/devicetree/bindings/sound/adi,adau1977.txt new file mode 100644 index 0000000..3cf03d8 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/adi,adau1977.txt @@ -0,0 +1,58 @@ +Analog Devices ADAU1977, ADAU1978, ADAU1979 devicetree bindings + +The ADAU1977 is a four channel audio ADC. It can either be connected to an I2C +or a SPI bus. Both bindings are described in this document. Depending on the bus +type different properties must/can be specified. + +Shared required properties: + - compatible: Must be "adi,adau1977", "adi,adau1978" or adi,adau1979" + - AVDD-supply: A handle to the power supply connected to the AVDD pin + +Shared optional properties: + - DVDD-supply: A handle to the power supply connected to the DVDD pin. If + specified the internal LDO will be disabled. + - reset-gpios: GPIO chip handle and specifier that define which GPIO is + connected to the chips PD/RST pin. If not specified the reset pin is assumed + to be hardwired to VCC. + - adi,micbias: Configures the voltage setting for the MICBIAS pin. If not + specified the default value will be 8.5 Volts. This property is only valid + for the ADAU1977. + Valid values for this property are: + 0: 5.0V + 1: 5.5V + 2: 6.0V + 3: 6.5V + 4: 7.0V + 5: 7.5V + 6: 8.0V + 7: 8.5V + 8: 9.0V + +I2C required properties: + - reg: The I2C address of the chip + +SPI required properties: + - reg: The SPI chipselect signal of the SPI master associated with this chip + - spi-max-frequency: Maximum spi frequency to use. + +Examples: + +&i2c_bus { + adau1977: codec@11 { + compatible = "adi,adau1977"; + reg = <0x11>; + reset-gpios = <&gpio 5 0>; + AVDD-supply = <&codec_avdd_supply>; + DVDD-supply = <&codec_dvdd_supply>; + }; +}; + +&spi_bus { + adau1977: codec@1 { + compatible = "adi,adau1977"; + reg = <0x1>; + spi-max-frequency = <10000000>; + AVDD-supply = <&codec_avdd_supply>; + adi,micbias = <5>; + }; +};
The ADAU1977 is a four channel audio ADC. It can either be connected to an I2C or a SPI bus. Both bindings are described in this document. Other than the standard I2C and SPI bus properties a regulator for the AVDD supply needs to be specified in the bindings. Optionally, if present in the hardware design, a regulator for the DVDD supply and a GPIO connected to the chips reset pin can be specified. The bindings also allow to specify the microphone bias voltage that should be used with the hardware design. Cc: Rob Herring <robh+dt@kernel.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Ian Campbell <ijc+devicetree@hellion.org.uk> Cc: Kumar Gala <galak@codeaurora.org> Cc: devicetree@vger.kernel.org Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> --- .../devicetree/bindings/sound/adi,adau1977.txt | 58 ++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/adi,adau1977.txt