Hi Marek,
Please CC linux-renesas-soc for drivers for (parts of) Renesas ARM SoCs.
On Tue, Jan 10, 2017 at 10:33 PM, Marek Vasut <marek.vasut@xxxxxxxxx> wrote:
> Add IIO driver for the Renesas RCar GyroADC block. This block is a
> simple 4/8-channel ADC which samples 12/15/24 bits of data every
> cycle from all channels.
>
> Signed-off-by: Marek Vasut <marek.vasut@xxxxxxxxx>
> Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> Cc: Simon Horman <horms+renesas@xxxxxxxxxxxx>
> ---
> V2: - Spelling fixes
> - Rename the driver source file to rcar-gyroadc
> - Rework the channel sample width handling
> - Use iio_device_claim_mode_direct()
> - Rename "renesas,rcar-gyroadc" to "renesas,r8a7791-gyroadc" and
> rename "renesas,rcar-gyroadc-r8a7792" to "renesas,r8a7792-gyroadc"
> to match the new naming scheme (WARNING: scif uses the old one!)
> - Switch to using regulators for channel voltage reference, add new
> properties renesas,gyroadc-vref-chN-supply for N in 0..7
> - Handle vref regulators as optional to, make channels without
> vref regulator return EINVAL on read.
> - Fix module license to GPL
> - Drop interrupt.h include
> - Rename clk to iclk
> - Rename RCar to R-Car
> - Rework the invalid mode handling
> - Don't print error message on EPROBE_DEFER
> - Drop fclk handling, use runtime PM for that instead
> V3: - More R-Car spelling fixes
> - Flip checks for V2H, since that's the only one that has
> interrupt registers
> - Replace if-else statement with switch statement in init_mode
> - Use unsigned types where applicable
> - Rework timing calculation slightly to drop if-else block
> - Use DIV_ROUND_CLOSEST
> V4: - Add renesas,rcar-gyroadc fallback compatible string into the bindings
> - Rework the ADC bindings to use per-channel subdevs
> - Support more compatible ADC chips
> ---
> .../bindings/iio/adc/renesas,gyroadc.txt | 70 +++
> MAINTAINERS | 6 +
> drivers/iio/adc/Kconfig | 10 +
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/rcar-gyroadc.c | 531 +++++++++++++++++++++
> 5 files changed, 618 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt
> create mode 100644 drivers/iio/adc/rcar-gyroadc.c
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt b/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt
> new file mode 100644
> index 000000000000..2dcea9c8895b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt
> @@ -0,0 +1,70 @@
> +* Renesas RCar GyroADC device driver
> +
> +Required properties:
> +- compatible: Should be "renesas,<chip>-gyroadc", "renesas,rcar-gyroadc".
> + Use "renesas,r8a7792-gyroadc" for a GyroADC with interrupt
> + block found in R8A7792.
> +- reg: Address and length of the register set for the device
> +- clocks: References to all the clocks specified in the clock-names
> + property as specified in
> + Documentation/devicetree/bindings/clock/clock-bindings.txt.
> +- clock-names: Shall contain "fck" and "if". The "fck" is the GyroADC block
> + clock, the "if" is the interface clock.
> +- power-domains: Must contain a reference to the PM domain, if available.
> +- #address-cells: Should be <1> (setting for the subnodes)
> +- #size-cells: Should be <0> (setting for the subnodes)
> +
> +Sub-nodes:
> +Optionally you can define subnodes which define the reference voltage
which defined the connected ADC type and the reference voltage
> +for the analog inputs.
"channels", to match the wording below?
> +
> +Required properties for subnodes:
> +- compatible: Should be either of:
> + "fujitsu,mb88101a"
> + - Fujitsu MB88101A compatible mode,
> + 12bit sampling, 4 channels
For this one, we have to find a better representation in DT.
Unlike the other two types, the MB88101A is a 4-channel ADC, and thus only
a single instance is supported, providing 4 channels.
Hence for MB88101A I suggest to just have a single node "adc", without a
unit address or "reg" property.
> + "ti,adcs7476" or "ti,adc121" or "adi,ad7476"
> + - TI ADCS7476 / TI ADC121 / ADI AD7476 compatible mode,
> + 15bit sampling, 8 channels
ADCS7476 are single channel ADCs.
"up to 8 channels can be connected"?
> + "maxim,max1162" or "maxim,max11100"
> + - Maxim MAX1162 / Maxim MAX11100 compatible mode,
> + 16bit sampling, 8 channels
MAX1162 and co are single channel ADCs.
"up to 8 channels can be connected"?
> +- reg: Should be the number of the analog input.
> +- vref-supply: Reference to the channel reference voltage regulator.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
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
