st_mmcss_cconfig(9)

💖 st_mmcss_cconfig(9) 💖

okay so bestie, welcome to the Kernel API Manual 🎀 you're about to learn how to configure the Arasan HC inside the flashSS and honestly? it's giving niche but iconic ✨

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🌸 NAME 🌸

st_mmcss_cconfig — configure the Arasan HC inside the flashSS 💅

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✨ SYNOPSIS ✨

void st_mmcss_cconfig (struct device_node *np , struct sdhci_host *host
);

like yes that's the whole signature, no cap 🫶

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🦋 ARGUMENTS 🦋

• np — the dt device node 🌱
• host — the sdhci host 👑

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💜 DESCRIPTION 💜

so what this function does is configure the Arasan host controller. literally its whole job 💖

here's the tea tho: on some ST SoCs — i.e. the STiH407 family — the MMC devices live inside a dedicated flashSS sub-system, and that sub-system needs to be configured to be compliant to eMMC 4.5 or eMMC4.3. yep, both, depending on what you're working with 🌈

🚨 important bestie: this has to be done before registering the sdhci host. no skipping ahead, the order matters fr fr 💀

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/mmc/host/sdhci-st.c — go read it, iykyk 📖✨

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and that's the whole page, bestie 🍓 slay. this gem comes from ./drivers/mmc/host, dated October 2026, and it's filed under st_mmcss_cconfig(9) — periodt 💅👑