linux-kernel - Re: [PATCH v2 16/18] arm: dts: owl-s500-roseapplepi: Add uSD support

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Date:   Sat, 5 Dec 2020 11:31:25 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Cristian Ciocaltea <cristian.ciocaltea@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-actions@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 16/18] arm: dts: owl-s500-roseapplepi: Add uSD support

On Sun, Nov 29, 2020 at 08:35:32PM +0200, Cristian Ciocaltea wrote:
> On Sat, Nov 28, 2020 at 01:08:51PM +0530, Manivannan Sadhasivam wrote:
> > On Fri, Nov 20, 2020 at 01:56:10AM +0200, Cristian Ciocaltea wrote:
> > > Add uSD support for RoseapplePi SBC using a fixed regulator as a
> > > temporary solution until PMIC support becomes available.
> > > 
> > > Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...il.com>
> > > ---
> > >  arch/arm/boot/dts/owl-s500-roseapplepi.dts | 50 ++++++++++++++++++++++
> > >  1 file changed, 50 insertions(+)
> > > 
> > > diff --git a/arch/arm/boot/dts/owl-s500-roseapplepi.dts b/arch/arm/boot/dts/owl-s500-roseapplepi.dts
> > > index 800edf5d2d12..fe9ae3619422 100644
> > > --- a/arch/arm/boot/dts/owl-s500-roseapplepi.dts
> > > +++ b/arch/arm/boot/dts/owl-s500-roseapplepi.dts
> > > @@ -14,6 +14,7 @@ / {
> > >  	model = "Roseapple Pi";
> > >  
> > >  	aliases {
> > > +		mmc0 = &mmc0;
> > >  		serial2 = &uart2;
> > >  	};
> > >  
> > > @@ -25,6 +26,55 @@ memory@0 {
> > >  		device_type = "memory";
> > >  		reg = <0x0 0x80000000>; /* 2GB */
> > >  	};
> > > +
> > > +	/* Fixed regulator used in the absence of PMIC */
> > > +	sd_vcc: sd-vcc {
> > 
> > Is this the exact name in the schematics?
> 
> Yes, it is referred as "SD_VCC". Once the support for the ATC260x PMIC
> will be available, the following item will be present in the regulators
> list:
> 
>   sd_vcc: switchldo1 {
> 	regulator-name = "SD_VCC";
> 	regulator-min-microvolt = <3000000>;
> 	regulator-max-microvolt = <3300000>;
> 	regulator-always-on;
> 	regulator-boot-on;
>   };

okay, looks fine to me.

Thanks,
Mani

> 
> Thanks,
> Cristi
> 
> > Thanks,
> > Mani
> > 
> > > +		compatible = "regulator-fixed";
> > > +		regulator-name = "fixed-3.1V";
> > > +		regulator-min-microvolt = <3100000>;
> > > +		regulator-max-microvolt = <3100000>;
> > > +		regulator-always-on;
> > > +	};
> > > +};
> > > +
> > > +&pinctrl {
> > > +	mmc0_pins: mmc0-pins {
> > > +		pinmux {
> > > +			groups = "sd0_d0_mfp", "sd0_d1_mfp", "sd0_d2_d3_mfp",
> > > +				 "sd0_cmd_mfp", "sd0_clk_mfp";
> > > +			function = "sd0";
> > > +		};
> > > +
> > > +		drv-pinconf {
> > > +			groups = "sd0_d0_d3_drv", "sd0_cmd_drv", "sd0_clk_drv";
> > > +			drive-strength = <8>;
> > > +		};
> > > +
> > > +		bias0-pinconf {
> > > +			pins = "sd0_d0", "sd0_d1", "sd0_d2",
> > > +			       "sd0_d3", "sd0_cmd";
> > > +			bias-pull-up;
> > > +		};
> > > +
> > > +		bias1-pinconf {
> > > +			pins = "sd0_clk";
> > > +			bias-pull-down;
> > > +		};
> > > +	};
> > > +};
> > > +
> > > +/* uSD */
> > > +&mmc0 {
> > > +	status = "okay";
> > > +	pinctrl-names = "default";
> > > +	pinctrl-0 = <&mmc0_pins>;
> > > +	no-sdio;
> > > +	no-mmc;
> > > +	no-1-8-v;
> > > +	cd-gpios = <&pinctrl 117 GPIO_ACTIVE_LOW>;
> > > +	bus-width = <4>;
> > > +	vmmc-supply = <&sd_vcc>;
> > > +	vqmmc-supply = <&sd_vcc>;
> > >  };
> > >  
> > >  &twd_timer {
> > > -- 
> > > 2.29.2
> > >