linux-kernel - Re: [PATCH 2/7] dt-bindings: mmc: Add Actions Semi SD/MMC/SDIO controller binding

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Date:   Mon, 10 Jun 2019 21:34:59 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Andreas Färber <afaerber@...e.de>
Cc:     ulf.hansson@...aro.org, robh+dt@...nel.org, sboyd@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        thomas.liau@...ions-semi.com, linux-actions@...ts.infradead.org,
        linus.walleij@...aro.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH 2/7] dt-bindings: mmc: Add Actions Semi SD/MMC/SDIO
 controller binding


Hi Andreas,

On Mon, Jun 10, 2019 at 03:45:37PM +0200, Andreas Färber wrote:
> Am 08.06.19 um 21:53 schrieb Manivannan Sadhasivam:
> > Add devicetree binding for Actions Semi Owl SoC's SD/MMC/SDIO controller.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  .../devicetree/bindings/mmc/owl-mmc.txt       | 37 +++++++++++++++++++
> >  1 file changed, 37 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mmc/owl-mmc.txt
> 
> Rob, should this be YAML now?
> 
> > 
> > diff --git a/Documentation/devicetree/bindings/mmc/owl-mmc.txt b/Documentation/devicetree/bindings/mmc/owl-mmc.txt
> > new file mode 100644
> > index 000000000000..a702f8d66cec
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mmc/owl-mmc.txt
> > @@ -0,0 +1,37 @@
> > +Actions Semi Owl SoCs SD/MMC/SDIO controller
> > +
> > +Required properties:
> > +- compatible: should be "actions,owl-mmc"
> > +- reg: offset and length of the register set for the device.
> > +- interrupts: single interrupt specifier.
> > +- clocks: single clock specifier of the controller clock.
> > +- resets: phandle to the reset line.
> > +- dma-names: should be "mmc".
> > +- dmas: single DMA channel specifier
> 
> I recall the main blocker for MMC being regulators, i.e. the I²C
> attached multi-function PMIC. Yet I don't see any such required property
> here, nor any patch series implementing it. Seems like this relies on
> U-Boot having initialized SD/eMMC? Do you intend to make them optional
> or did you want to hold off merging this one until the rest is done?
> 

Yeah, I'm planning to rely on u-boot for regulator enablement. PMIC support
in kernel will take some time because the floating SIRQ patchset is not yet
finished.

> > +
> > +Optional properties:
> > +- pinctrl-names: pinctrl state names "default" must be defined.
> > +- pinctrl-0: phandle referencing pin configuration of the controller.
> > +- bus-width: see mmc.txt
> > +- cap-sd-highspeed: see mmc.txt
> > +- cap-mmc-highspeed: see mmc.txt
> > +- sd-uhs-sdr12: see mmc.txt
> > +- sd-uhs-sdr25: see mmc.txt
> > +- sd-uhs-sdr50: see mmc.txt
> > +- non-removable: see mmc.txt
> 
> I'm not convinced duplicating common properties is a good idea here, in
> particular pinctrl.
> 

Hmmm, I thought of adding the MMC properties which were supported by the SoC.
I can remove those if needed.

Thanks,
Mani

> Regards,
> Andreas
> 
> > +
> > +Example:
> > +
> > +		mmc0: mmc@...30000 {
> > +			compatible = "actions,owl-mmc";
> > +			reg = <0x0 0xe0330000 0x0 0x4000>;
> > +			interrupts = <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
> > +			clocks = <&cmu CLK_SD0>;
> > +			resets = <&cmu RESET_SD0>;
> > +			dmas = <&dma 2>;
> > +			dma-names = "mmc";
> > +			pinctrl-names = "default";
> > +			pinctrl-0 = <&mmc0_default>;
> > +			bus-width = <4>;
> > +			cap-sd-highspeed;
> > +		};
> > 
> 
> 
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