linux-kernel - Re: [PATCH] arm64: dts: ti: k3-j784s4-evm: Add eMMC mmc0 support

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Date:   Thu, 30 Mar 2023 23:14:51 +0530
From:   Bhavya Kapoor <b-kapoor@...com>
To:     Nishanth Menon <nm@...com>
CC:     Apurva Nandan <a-nandan@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Kumar, Udit" <u-kumar1@...com>
Subject: Re: [PATCH] arm64: dts: ti: k3-j784s4-evm: Add eMMC mmc0 support


On 30/03/23 20:54, Nishanth Menon wrote:
> On 11:50-20230330, Bhavya Kapoor wrote:
>> On 27/03/23 14:01, Apurva Nandan wrote:
>>> Add support for eMMC card connected to main sdhci0 instance.
>>>
>>> Signed-off-by: Apurva Nandan <a-nandan@...com>
>> Reviewed-by: Bhavya Kapoor <b-kapoor@...com>
>>
>>> ---
>>>   arch/arm64/boot/dts/ti/k3-j784s4-evm.dts | 9 +++++++++
>>>   1 file changed, 9 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
>>> index 7480f37e89e8..1622a01a4667 100644
>>> --- a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
>>> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
>>> @@ -21,6 +21,7 @@ chosen {
>>>
>>>   	aliases {
>>>   		serial2 = &main_uart8;
>>> +		mmc0 = &main_sdhci0;
>>>   		mmc1 = &main_sdhci1;
>>>   		i2c0 = &main_i2c0;
>>>   	};
>>> @@ -225,6 +226,14 @@ exp2: gpio@22 {
>>>   	};
>>>   };
>>>
>>> +&main_sdhci0 {
>>> +	/* eMMC */
>>> +	status = "okay";
>>> +	non-removable;
>>> +	ti,driver-strength-ohm = <50>;
>>> +	disable-wp;
>>> +};
>>> +
>>>   &main_sdhci1 {
>>>   	/* SD card */
>>>   	status = "okay";
>>> --
>>> 2.34.1
>> Looks correct to me.
>
> Don't you need pinmux?
>
Hi Nishanth, pinmux is not needed since there is no mux options for emmc pins (mmc0) in datasheet.

 -> Kindly refer to datasheet for same : https://www.ti.com/lit/ds/symlink/tda4vh-q1.pdf?ts=1680197698102&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTDA4VH-Q1%253FkeyMatch%253DTDA4VH%2BDATASHEET


Regards

~B-Kapoor