linux-kernel - Re: [PATCH v7 3/3] arm64: dts: ti: k3-j7200: Add support for higher speed modes and update delay select values for MMCSD subsystems

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Message-ID: <20210322153547.d5hkqydpe372rpwg@manicure>
Date:   Mon, 22 Mar 2021 10:35:47 -0500
From:   Nishanth Menon <nm@...com>
To:     Aswath Govindraju <a-govindraju@...com>
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Lokesh Vutla <lokeshvutla@...com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 3/3] arm64: dts: ti: k3-j7200: Add support for higher
 speed modes and update delay select values for MMCSD subsystems

On 18:42-20210322, Aswath Govindraju wrote:
> The following speed modes are now supported in J7200 SoC,
> - HS200 and HS400 modes at 1.8 V card voltage, in MMCSD0 subsystem [1].
> - UHS-I speed modes in MMCSD1 subsystem [1].
> 
> Add support for UHS-I modes by adding voltage regulator device tree nodes
> and corresponding pinmux details, to power cycle and voltage switch cards.
> Set respective tags in sdhci0 and remove no-1-8-v tag from sdhci1
> device tree nodes.
> 
> Also update the delay values for various speed modes supported, based on
> the revised january 2021 J7200 datasheet[2].
> 
> [1] - section 12.3.6.1.1 MMCSD Features, in
>       https://www.ti.com/lit/ug/spruiu1a/spruiu1a.pdf,
>       (SPRUIU1A – JULY 2020 – REVISED JANUARY 2021)
> 
> [2] - https://www.ti.com/lit/ds/symlink/dra821u.pdf,
>       (SPRSP57B – APRIL 2020 – REVISED JANUARY 2021)
> 
> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> ---
>  .../dts/ti/k3-j7200-common-proc-board.dts     | 42 +++++++++++++++++++
>  arch/arm64/boot/dts/ti/k3-j7200-main.dtsi     | 14 ++++++-
>  2 files changed, 54 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
> index b493f939b09a..de8c06bdc825 100644
> --- a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
> @@ -16,6 +16,29 @@
>  		stdout-path = "serial2:115200n8";
>  		bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000";
>  	};
> +
> +	vdd_mmc1: fixedregulator-sd {
> +		compatible = "regulator-fixed";
> +		regulator-name = "vdd_mmc1";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		regulator-boot-on;
> +		enable-active-high;
> +		gpios = <&exp2 2 GPIO_ACTIVE_HIGH>;

is that gpio ?
I'd encourage to use vin-supply as well.

> +	};
> +
> +	vdd_sd_dv: gpio-regulator-vdd-sd-dv {
	What does this drive? TLV71033 ?
> +		compatible = "regulator-gpio";
> +		regulator-name = "vdd_sd_dv";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&vdd_sd_dv_pins_default>;
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <3300000>;
> +		regulator-boot-on;

normally, I'd encourage to use vin-supply as well.

> +		gpios = <&main_gpio0 55 GPIO_ACTIVE_HIGH>;
> +		states = <1800000 0x0
> +			  3300000 0x1>;
states = <1800000 0x0>,
<3300000 0x1>;

Can you look at j721e as reference?

> +	};
>  };
>  

Kishon,
	can you look closer at this series?
-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D