[PATCH 08/10] sdhci: Add set_clock callback

[Anton Vorontsov <avorontsov@ru.mvista.com>]

FSL eSDHC hosts have incompatible register map to manage the SDCLK.
This patch adds set_clock callback so that drivers could overwrite
set_clock behaviour.

Similar patch[1] was posted by Ben Dooks, though in Ben's version the
callback is named change_clock, plus the patch has some unrelated bits
that makes the patch difficult to reuse.

[1] http://lkml.org/lkml/2008/12/2/160

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
---
 drivers/mmc/host/sdhci.c |    5 +++++
 drivers/mmc/host/sdhci.h |    2 ++
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9ac088a..e456ae0 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -959,6 +959,11 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 	if (clock == host->clock)
 		return;
 
+	if (host->ops->set_clock) {
+		host->ops->set_clock(host, clock);
+		return;
+	}
+
 	sdhci_writew(host, SDHCI_CLOCK_CONTROL, 0);
 
 	if (clock == 0)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 7e3b01f..39cfd5a 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -303,6 +303,8 @@ struct sdhci_ops {
 	void		(*writew)(struct sdhci_host *host, int reg, u16 val);
 	void		(*writeb)(struct sdhci_host *host, int reg, u8 val);
 
+	void	(*set_clock)(struct sdhci_host *host, unsigned int clock);
+
 	int		(*enable_dma)(struct sdhci_host *host);
 };
 
-- 
1.5.6.5