linux-kernel - Re: [PATCH v8 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: <6b8b71fc-7b0e-6e6a-6d2f-43087032f0b4@ti.com>
Date:   Fri, 26 Mar 2021 11:30:52 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     Kishon Vijay Abraham I <kishon@...com>
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Lokesh Vutla <lokeshvutla@...com>, Nishanth Menon <nm@...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 v8 3/3] arm64: dts: ti: k3-j7200: Add support for higher
 speed modes and update delay select values for MMCSD subsystems

Hi Kishon,

On 25/03/21 9:44 pm, Kishon Vijay Abraham I wrote:
> Hi Aswath,
> 
> On 24/03/21 12:07 pm, 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)
> minor comments below.. once you fix them, please add
> 
> Reviewed-by: Kishon Vijay Abraham I <kishon@...com>
>>

Thank you for your review :).

>> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
>> ---
>>  .../dts/ti/k3-j7200-common-proc-board.dts     | 78 +++++++++++++++++++
>>  arch/arm64/boot/dts/ti/k3-j7200-main.dtsi     | 14 +++-
>>  2 files changed, 90 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..a069787e1783 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 +16,65 @@
>>  		stdout-path = "serial2:115200n8";
>>  		bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000";
>>  	};
>> +
>> +	evm_12v0: fixedregulator-evm12v0 {
>> +		/* main supply */
>> +		compatible = "regulator-fixed";
>> +		regulator-name = "evm_12v0";
>> +		regulator-min-microvolt = <12000000>;
>> +		regulator-max-microvolt = <12000000>;
>> +		regulator-always-on;
>> +		regulator-boot-on;
>> +	};
>> +
>> +	vsys_3v3: fixedregulator-vsys3v3 {
>> +		/* Output of LMS140 */
> 
> %s/LMS140/LM5140

Will make this change in respin.

>> +		compatible = "regulator-fixed";
>> +		regulator-name = "vsys_3v3";
>> +		regulator-min-microvolt = <3300000>;
>> +		regulator-max-microvolt = <3300000>;
>> +		vin-supply = <&evm_12v0>;
>> +		regulator-always-on;
>> +		regulator-boot-on;
>> +	};
>> +
>> +	vsys_5v0: fixedregulator-vsys5v0 {
>> +		/* Output of LM5140 */
>> +		compatible = "regulator-fixed";
>> +		regulator-name = "vsys_5v0";
>> +		regulator-min-microvolt = <5000000>;
>> +		regulator-max-microvolt = <5000000>;
>> +		vin-supply = <&evm_12v0>;
>> +		regulator-always-on;
>> +		regulator-boot-on;
>> +	};
>> +
>> +	vdd_mmc1: fixedregulator-sd {
>> +		/* Output of TPS22918  */
>> +		compatible = "regulator-fixed";
>> +		regulator-name = "vdd_mmc1";
>> +		regulator-min-microvolt = <3300000>;
>> +		regulator-max-microvolt = <3300000>;
>> +		regulator-boot-on;
>> +		enable-active-high;
>> +		vin-supply = <&vsys_3v3>;
>> +		gpio = <&exp2 2 GPIO_ACTIVE_HIGH>;
>> +	};
>> +
>> +	vdd_sd_dv: gpio-regulator-vdd-sd-dv {
>> +		/* Output of TLV71033 */
> 
> Would have preferred to keep this similar to j721e.
> gpio-regulator-TLV71033 is used in j721e

Will make this change in respin

>> +		compatible = "regulator-gpio";
>> +		regulator-name = "vdd_sd_dv";
> 
> same comment here..

Will make this change in respin

>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&vdd_sd_dv_pins_default>;
>> +		regulator-min-microvolt = <1800000>;
>> +		regulator-max-microvolt = <3300000>;
>> +		regulator-boot-on;
>> +		vin-supply = <&vsys_5v0>;
>> +		gpios = <&main_gpio0 55 GPIO_ACTIVE_HIGH>;
>> +		states = <1800000 0x0>,
>> +			 <3300000 0x1>;
>> +	};
>>  };
>>  
>>  &wkup_pmx0 {
>> @@ -45,6 +104,13 @@
>>  };
>>  
>>  &main_pmx0 {
>> +	main_i2c0_pins_default: main-i2c0-pins-default {
>> +		pinctrl-single,pins = <
>> +			J721E_IOPAD(0xd4, PIN_INPUT_PULLUP, 0) /* (V3) I2C0_SCL */
>> +			J721E_IOPAD(0xd8, PIN_INPUT_PULLUP, 0) /* (W2) I2C0_SDA */
>> +		>;
>> +	};
>> +
>>  	main_i2c1_pins_default: main-i2c1-pins-default {
>>  		pinctrl-single,pins = <
>>  			J721E_IOPAD(0xdc, PIN_INPUT_PULLUP, 3) /* (U3) ECAP0_IN_APWM_OUT.I2C1_SCL */
>> @@ -70,6 +136,12 @@
>>  			J721E_IOPAD(0x120, PIN_OUTPUT, 0) /* (T4) USB0_DRVVBUS */
>>  		>;
>>  	};
>> +
>> +	vdd_sd_dv_pins_default: vdd-sd-dv-pins-default {
>> +		pinctrl-single,pins = <
>> +			J721E_IOPAD(0xd0, PIN_INPUT, 7) /* (T5) SPI0_D1.GPIO0_55 */
> 
> This should ideally be PIN_OUTPUT. Can you check the latest sysconfig?
> 

The sysconfig tool by default is giving the mode as
PIN_INPUT(bidirectional) but yes ideally this should be PIN_OUTPUT. Will
make this change in respin.

Thanks,
Aswath

> Thanks
> Kishon
>