On Wed, Apr 20, 2016 at 01:07:49PM +0200, Jeppe Ledet-Pedersen wrote:
> This patch adds support for the Cypress Semiconductor FM33256B processor
> companion. The device contains a 256 kbit FRAM, an RTC, a supply voltage
> monitor, and a watchdog timer.
>
> Signed-off-by: Jeppe Ledet-Pedersen <jlp@xxxxxxxxxxxx>
> ---
> Documentation/devicetree/bindings/mfd/fm33256b.txt | 30 ++
> MAINTAINERS | 6 +
> drivers/mfd/Kconfig | 16 +
> drivers/mfd/Makefile | 1 +
> drivers/mfd/fm33256b.c | 488 +++++++++++++++++++++
> include/linux/mfd/fm33256b.h | 76 ++++
> 6 files changed, 617 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mfd/fm33256b.txt
> create mode 100644 drivers/mfd/fm33256b.c
> create mode 100644 include/linux/mfd/fm33256b.h
>
> diff --git a/Documentation/devicetree/bindings/mfd/fm33256b.txt b/Documentation/devicetree/bindings/mfd/fm33256b.txt
> new file mode 100644
> index 0000000..6591c94
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/fm33256b.txt
> @@ -0,0 +1,30 @@
> +Device-tree bindings for Cypress Semiconductor FM33256B Processor Companion
> +---------------------------------------------------------------------------
> +
> +Required properties:
> +- compatible: must be "cypress,fm33256b".
> +- reg: SPI chip select
> +- spi-max-frequency: Max SPI frequency to use (< 16000000)
> +
> +Optional properties:
> +- cypress,charge-enabled: enable trickle charger
What does the driver do if charging is disabled? Would using 'status =
"disabled"' be any different?
> +- cypress,charge-fast: enable fast (1 mA) charging
What does fast mean?
I think it is time for a common binding here. There's all sorts of
variations on setting the charge current in bindings. Add something like
"charge-current-microamp" in power_supply.txt and use it here. Then
1000uA implies "fast charge".
> +
> +The MFD exposes two subdevices:
> +- The FRAM: "cypress,fm33256b-fram"
> +- The RTC: "cypress,fm33256b-rtc"
> +
> +Example:
> +
> +spi1: spi@f800800 {
> + status = "okay";
> + cs-gpios = <&pioC 25 0>;
> +
> + fm33256b@0 {
> + compatible = "cypress,fm33256b";
> + spi-max-frequency = <10000000>;
> + cypress,charge-enabled;
> + cypress,charge-fast;
> + reg = <0>;
> + };
Where's the 2nd sub device?
> +};
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