From: Dong Aisheng <aisheng.dong@freescale.com>
Date: Wed, 22 Jul 2015 12:53:07 +0000 (+0800)
Subject: mmc: sdhci: make max-frequency property in device tree work
X-Git-Tag: omap-for-v4.3/fixes-merge-window~194^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5924175755a0ed902d91f2f2660e914032fa63e5;p=pandora-kernel.git

mmc: sdhci: make max-frequency property in device tree work

Device tree provides option to specify the max freqency with property
"max-frequency" in dts and common parse function mmc_of_parse() will
parse it and use this value to set host->f_max to tell the MMC core
the maxinum frequency the host works.

However, current sdhci driver will finally overwrite this value with
host->max_clk regardless of the max-frequency property.

This patch makes sure not overwrite the max-frequency set from device
tree and do basic sanity check.

Signed-off-by: Dong Aisheng <aisheng.dong@freescale.com>
Reviewed-by: Johan Derycke <johan.derycke@barco.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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