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mmc: core: Remove MMC_CLKGATE

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MMC_CLKGATE was once invented to save power by gating the bus clock at
request inactivity. At that time it served its purpose. The modern way to
deal with power saving for these scenarios, is by using runtime PM.

Nowadays, several host drivers have deployed runtime PM, but for those
that haven't and which still cares power saving at request inactivity,
it's certainly time to deploy runtime PM as it has been around for several
years now.

To simplify code to mmc core and thus decrease maintenance efforts, this
patch removes all code related to MMC_CLKGATE.

Signed-off-by: Ulf Hansson <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
This commit is contained in:
Ulf Hansson 2015-10-02 10:56:11 +02:00
commit 9eadcc0581
13 changed files with 19 additions and 469 deletions
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10
Documentation/mmc/mmc-dev-attrs.txt
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@ -72,13 +72,3 @@ Note on raw_rpmb_size_mult:
"raw_rpmb_size_mult" is a mutliple of 128kB block.
RPMB size in byte is calculated by using the following equation:
RPMB partition size = 128kB x raw_rpmb_size_mult
SD/MMC/SDIO Clock Gating Attribute
==================================
Read and write access is provided to following attribute.
This attribute appears only if CONFIG_MMC_CLKGATE is enabled.
clkgate_delay Tune the clock gating delay with desired value in milliseconds.
echo <desired delay> > /sys/class/mmc_host/mmcX/clkgate_delay