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Subject[PATCH v2 5/6] mmc: sdhci: implement enhanced strobe callback
Date
Enhanced strobe stuff currently is beyond the scope
of Secure Digital Host Controller Interface. So we can't
find a register here to enable/disable it. We experct
variant drivers to finish the details according to their
vendor settings.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
---

Changes in v2: None

drivers/mmc/host/sdhci.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 94cffa7..a04e4c4 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2049,6 +2049,16 @@ out_unlock:
return err;
}

+static int sdhci_prepare_enhanced_strobe(struct mmc_host *mmc, bool enable)
+{
+ /*
+ * Currently we can't find a register to enable enhanced strobe
+ * function for standard sdhci, so we expect variant drivers to
+ * overwrite it.
+ */
+ return -EINVAL;
+}
+
static int sdhci_select_drive_strength(struct mmc_card *card,
unsigned int max_dtr, int host_drv,
int card_drv, int *drv_type)
@@ -2158,6 +2168,7 @@ static const struct mmc_host_ops sdhci_ops = {
.enable_sdio_irq = sdhci_enable_sdio_irq,
.start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
.prepare_hs400_tuning = sdhci_prepare_hs400_tuning,
+ .prepare_enhanced_strobe = sdhci_prepare_enhanced_strobe,
.execute_tuning = sdhci_execute_tuning,
.select_drive_strength = sdhci_select_drive_strength,
.card_event = sdhci_card_event,
--
2.3.7

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