Hello Matt,
On Thu, Nov 17, 2016 at 10:55 PM, Matt Ranostay
<matt@ranostay.consulting> wrote:
> Allow power sequencing for the Marvell SD8787 Wifi/BT chip.
> This can be abstracted to other chipsets if needed in the future.
>
> Cc: Tony Lindgren <tony@xxxxxxxxxxx>
> Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
> Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
> ---
> .../devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt | 14 +++
> .../bindings/net/wireless/marvell-sd8xxx.txt | 4 +
> drivers/mmc/core/Kconfig | 10 ++
> drivers/mmc/core/Makefile | 1 +
> drivers/mmc/core/pwrseq_sd8787.c | 117 +++++++++++++++++++++
> 5 files changed, 146 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt
> create mode 100644 drivers/mmc/core/pwrseq_sd8787.c
>
> diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt
According Documentation/devicetree/bindings/submitting-patches.txt,
the DT bindings patches should posted as a separate patch.
> new file mode 100644
> index 000000000000..1b658351629b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt
> @@ -0,0 +1,14 @@
> +* Marvell SD8787 power sequence provider
> +
> +Required properties:
> +- compatible: must be "mmc-pwrseq-sd8787".
Since this is not a generic binding, the compatible string should have
a vendor prefix.
> +- pwndn-gpio: contains a power down GPIO specifier.
> +- reset-gpio: contains a reset GPIO specifier.
> +
I wonder if we really need a custom power sequence provider for just
this SDIO WiFI chip though. AFAICT the only missing piece in
mmc-pwrseq-simple is the power down GPIO property, so maybe
mmc-pwrseq-simple could be extended instead to have an optional
powerdown-gpios property and instead in the Marvell SD8787 DT binding
can be mentioned which mmc-pwrseq-simple properties are required for
the device.
> +Example:
> +
> + wifi_pwrseq: wifi_pwrseq {
> + compatible = "mmc-pwrseq-sd8787";
> + pwrdn-gpio = <&twl_gpio 0 GPIO_ACTIVE_LOW>;
> + reset-gpio = <&twl_gpio 1 GPIO_ACTIVE_LOW>;
> + }
> diff --git a/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt b/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt
Does this patch depend on a previous posted series? I don't see this
file in today's linux-next...
> index c421aba0a5bc..08fd65d35725 100644
> --- a/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt
> +++ b/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt
> @@ -32,6 +32,9 @@ Optional properties:
> so that the wifi chip can wakeup host platform under certain condition.
> during system resume, the irq will be disabled to make sure
> unnecessary interrupt is not received.
> + - vmmc-supply: a phandle of a regulator, supplying VCC to the card
> + - mmc-pwrseq: phandle to the MMC power sequence node. See "mmc-pwrseq-*"
> + for documentation of MMC power sequence bindings.
>
> Example:
>
> @@ -44,6 +47,7 @@ so that firmware can wakeup host using this device side pin.
> &mmc3 {
> status = "okay";
> vmmc-supply = <&wlan_en_reg>;
> + mmc-pwrseq = <&wifi_pwrseq>;
> bus-width = <4>;
> cap-power-off-card;
> keep-power-in-suspend;
I think this change should be split in a separate patch as well.
Best regards,
Javier
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