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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Date:   Tue, 23 Mar 2021 10:54:17 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     Nishanth Menon <nm@...com>, Kishon Vijay Abraham I <kishon@...com>
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Lokesh Vutla <lokeshvutla@...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

Hi Nishanth,

On 22/03/21 9:05 pm, Nishanth Menon wrote:
> 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 ?

Yes, that is correct. I'll correct it in the respin

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

Will add this in respin.

> 
>> +	};
>> +
>> +	vdd_sd_dv: gpio-regulator-vdd-sd-dv {
> 	What does this drive? TLV71033 ?

Yes, this node models the TLV71033 voltage regulator that switches the
MMC IO signal voltage level between 3.3V and 1.8V.


>> +		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.

Will add this in the respin

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

Will make this change in the respin.

> Can you look at j721e as reference?
> 

Will make changes accordingly.

>> +	};
>>  };
>>  
> 
> Kishon,
> 	can you look closer at this series?
> 

I'll wait for kishon's feedback and then post respin of this series.


Thank you for the review.

Regards,
Aswath