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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 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