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Diffstat (limited to 'Documentation/devicetree/bindings/mmc/mmc.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/mmc.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt index bac131169c07..438899e8829b 100644 --- a/Documentation/devicetree/bindings/mmc/mmc.txt +++ b/Documentation/devicetree/bindings/mmc/mmc.txt @@ -65,6 +65,18 @@ Optional SDIO properties: - enable-sdio-wakeup: Enables wake up of host system on SDIO IRQ assertion +MMC power sequences: +-------------------- + +System on chip designs may specify a specific MMC power sequence. To +successfully detect an (e)MMC/SD/SDIO card, that power sequence must be +maintained while initializing the card. + +Optional property: +- mmc-pwrseq: phandle to the MMC power sequence node. See "mmc-pwrseq-*" + for documentation of MMC power sequence bindings. + + Use of Function subnodes ------------------------ @@ -101,6 +113,7 @@ sdhci@ab000000 { max-frequency = <50000000>; keep-power-in-suspend; enable-sdio-wakeup; + mmc-pwrseq = <&sdhci0_pwrseq> } Example with sdio function subnode: @@ -114,6 +127,7 @@ mmc3: mmc@01c12000 { vmmc-supply = <®_vmmc3>; bus-width = <4>; non-removable; + mmc-pwrseq = <&sdhci0_pwrseq> status = "okay"; brcmf: bcrmf@1 { |