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Sashiko AI review found 1 >>>>> potential issue(s) to consider: >>>>> - [High] Setting MMC clock pins to PIN_OUTPUT disables the receiver >>>>> (RXACTIVE=0), which breaks the internal clock loopback required by >>>>> the MMC controller for read operations. >>>>> -- >>>>> >>>>> --- Patch [1]: [PATCH v1] arm64: dts: ti: k3-am62-verdin: Set MMC >>>>> clock pins as OUTPUT --- >>>>> commit b7e315f9edd8f485234748a2f8e267539b5b0f30 >>>>> Author: Francesco Dolcini >>>>> >>>>> arm64: dts: ti: k3-am62-verdin: Set MMC clock pins as OUTPUT >>>>> >>>>> This commit changes the MMC clock pins for the K3 AM62x Verdin module >>>>> from PIN_INPUT to PIN_OUTPUT to match the TRM documentation, >>>>> effectively >>>>> disabling the receiver (RXACTIVE = 0). >>>>> >>>>> Link: https://www.ti.com/lit/pdf/spruiv7 Rev. C: Table 12-246. >>>>> MMCSDi I/O Signals [0] >>>>> >>>>>> diff --git a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi b/arch/ >>>>>> arm64/boot/dts/ti/k3-am62-verdin.dtsi >>>>>> index e97b2b047d104..895b1b7dcac71 100644 >>>>>> --- a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi >>>>>> +++ b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi >>>>>> @@ -573,7 +573,7 @@ AM62X_IOPAD(0x15c, PIN_INPUT, 0)  /* (AB22) >>>>>> MDIO0_MDIO */ /* ETH_1_MDIO, SODIMM >>>>>>        pinctrl_sdhci0: main-mmc0-default-pins { >>>>>>            pinctrl-single,pins = < >>>>>>                AM62X_IOPAD(0x220, PIN_INPUT,        0) /*  (Y3) >>>>>> MMC0_CMD  */ >>>>>> -            AM62X_IOPAD(0x218, PIN_INPUT,        0) /* (AB1) >>>>>> MMC0_CLK  */ >>>>>> +            AM62X_IOPAD(0x218, PIN_OUTPUT,       0) /* (AB1) >>>>>> MMC0_CLK  */ >>>>> >>>>> [Severity: High] >>>>> Does configuring this pin as PIN_OUTPUT disable the receiver >>>>> (RXACTIVE=0) and >>>>> break the internal clock loopback? >>>>> >>>>> TI MMC controllers generally rely on this internal clock loopback >>>>> path to >>>>> synchronize incoming data for read operations. While the TRM >>>>> documents the >>>>> logical direction of the signal to the external card, disabling the >>>>> input >>>>> receiver might lead to eMMC read failures and timeouts. >>>> >>>> Judith: is sashiko right on this? >>> Changing to PIN_OUTPUT should not break anything for you on AM62x based >>> board. By default the input buffer for CLK pin is not used, CLKLB input >>> buffer is used instead. CLKLB input is already configured for you by >>> default, you should not be modifying CLKLB for MMC0 nor MMC1. >>> >>> This logic does not apply for MMC2. >> >> What do you mean? that MMC2_CLK should stay as input? > > Well, there is a reason MMC2 CLKLB pin is defined in pinmux nodes on TI > boards (: By default, MMC2 CLKLB is disabled after reset unlike MMC0 and Meant to say MMC2 CLKLB input buffer is disabled after reset by default, as in, RX_ACTIVE=0. > MMC1. If we do not enable it in software -> PIN_INPUT, then the MMCSD > loopback clock input would not work and your MMC2 would not work. > > ~ Judith >