diff options
| author |   Linus Walleij <linus.walleij@stericsson.com> | 2010-04-08 07:39:38 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2010-04-14 16:08:18 +0100 |
| commit | 808d97ccbe8e8251b1435e86c762965fd7e8a75e (patch) | |
| tree | b45e594937a226c4d346240f9d3387c4cd8e5b8a /drivers/mmc/host | |
| parent | ARM: 6032/1: ARM: MMCI: support 8bit mode on the ST Micro version (diff) | |
| download | linux-dev-808d97ccbe8e8251b1435e86c762965fd7e8a75e.tar.xz linux-dev-808d97ccbe8e8251b1435e86c762965fd7e8a75e.zip | |
ARM: 6033/1: ARM: MMCI: pass max frequency from platform
This introduce the field f_max into the mmci_platform_data,
making it possible to pass in a desired block clocking frequency
from a board configuration. This is often more desirable than
using a module parameter. We keep the module parameter as a
fallback as well as the default frequency specified for this
parameter if a parameter is not provided.
This also adds some kerneldoc style documentation to the
platform data struct in mmci.h.
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/mmci.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 7e70c1a06d8a..ff115d920888 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -631,7 +631,18 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id) mmc->ops = &mmci_ops; mmc->f_min = (host->mclk + 511) / 512; - mmc->f_max = min(host->mclk, fmax); + /* + * If the platform data supplies a maximum operating + * frequency, this takes precedence. Else, we fall back + * to using the module parameter, which has a (low) + * default value in case it is not specified. Either + * value must not exceed the clock rate into the block, + * of course. + */ + if (plat->f_max) + mmc->f_max = min(host->mclk, plat->f_max); + else + mmc->f_max = min(host->mclk, fmax); dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max); #ifdef CONFIG_REGULATOR |