ENUM DDR_PWRST(9)

enum ddr_pwrst(9) — DDR power states definition 💖

okay so bestie, this page lives in the Kernel API Manual and it's literally just the enum that names the DDR power states. that's the whole vibe. it's a header-file enum, it's iconic, it's short, and we're gonna read it together 🫶

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✨ NAME ✨

enum ddr_pwrst — the definition of DDR power states, no cap 🌸

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✨ SYNOPSIS ✨

here's the exact shape of it, copy it character for character or don't come at me:

enum ddr_pwrst {
    DDR_PWR_STATE_UNCHANGED ,
    DDR_PWR_STATE_ON ,
    DDR_PWR_STATE_OFFLOWLAT ,
    DDR_PWR_STATE_OFFHIGHLAT

};

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✨ Constants ✨

• DDR_PWR_STATE_UNCHANGED — says it right there: the SDRAM and the DDR controller state is unchanged. nothing moves, nothing shifts, we stay exactly as we are 💅
• DDR_PWR_STATE_ON — listed with no description on this page. it's just here, existing, main character energy ✨
• DDR_PWR_STATE_OFFLOWLAT — also listed with no description. the page lifts it up and says nothing else. we respect the mystery 🙈
• DDR_PWR_STATE_OFFHIGHLAT — same deal, no description given. four constants, one explanation. that's the arrangement 🎀

ngl, three of these four have zero description text on the page — i'm not about to invent one for them, so if you need the semantics, go read the header. lowkey the right move anyway 💀

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✨ SEE ALSO ✨

the kernel file is ./include/linux/mfd/db8500-prcmu.h, and the page points you at this whole friend group:

enum state(9), enum ret_state(9), enum clk_arm(9), enum clk_gen(9), enum romcode_write(9), enum romcode_read(9), enum ap_pwrst(9), enum ap_pwrst_trans(9), enum hw_acc_state(9), enum dvfs_stat(9), enum sva_mmdsp_stat(9), enum sia_mmdsp_stat(9), enum mbox_to_arm_err(9), enum sia_sva_pwr_policy(9), enum auto_enable(9), enum prcmu_power_status(9), enum prcmu_wdog_id(9), enum ape_opp(9), enum arm_opp(9), enum ddr_opp(9), struct prcmu_auto_pm_config(9)

like, go off, read the whole clique 👑

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so yeah, that's the page 🦋 it ships out of ./include/linux/mfd, and this particular copy is dated October 2026 — that's the source, the version and the date all wrapped up in one little sign-off. k byeee, go read the header file fr fr 💜