[PATCH v5 4/9] mmc: dw_mmc: lookup for optional biu and ciu clocks

[Thomas Abraham]

Some platforms allow for clock gating and control of bus interface unit clock
and card interface unit clock. Add support for clock lookup of optional biu
and ciu clocks for clock gating and clock speed determination.

Signed-off-by: Abhilash Kesavan <a.kesavan at samsung.com>
Signed-off-by: Thomas Abraham <thomas.abraham at linaro.org>
Acked-by: Will Newton <will.newton at imgtec.com>
---
 drivers/mmc/host/dw_mmc.c  |   50 +++++++++++++++++++++++++++++++++++++++++--
 include/linux/mmc/dw_mmc.h |    4 +++
 2 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 227c42e..e8c8491 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1960,13 +1960,40 @@ int dw_mci_probe(struct dw_mci *host)
 		return -ENODEV;
 	}
 
-	if (!host->pdata->bus_hz) {
+	host->biu_clk = clk_get(host->dev, "biu");
+	if (IS_ERR(host->biu_clk)) {
+		dev_dbg(host->dev, "biu clock not available\n");
+	} else {
+		ret = clk_prepare_enable(host->biu_clk);
+		if (ret) {
+			dev_err(host->dev, "failed to enable biu clock\n");
+			return ret;
+		}
+	}
+
+	host->ciu_clk = clk_get(host->dev, "ciu");
+	if (IS_ERR(host->ciu_clk)) {
+		dev_dbg(host->dev, "ciu clock not available\n");
+	} else {
+		ret = clk_prepare_enable(host->ciu_clk);
+		if (ret) {
+			dev_err(host->dev, "failed to enable ciu clock\n");
+			goto err_clk_biu;
+		}
+	}
+
+	if (IS_ERR(host->ciu_clk))
+		host->bus_hz = host->pdata->bus_hz;
+	else
+		host->bus_hz = clk_get_rate(host->ciu_clk);
+
+	if (!host->bus_hz) {
 		dev_err(host->dev,
 			"Platform data must supply bus speed\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto err_clk_ciu;
 	}
 
-	host->bus_hz = host->pdata->bus_hz;
 	host->quirks = host->pdata->quirks;
 
 	spin_lock_init(&host->lock);
@@ -2116,6 +2143,17 @@ err_dmaunmap:
 		regulator_disable(host->vmmc);
 		regulator_put(host->vmmc);
 	}
+
+err_clk_ciu:
+	if (!IS_ERR(host->ciu_clk)) {
+		clk_disable_unprepare(host->ciu_clk);
+		clk_put(host->ciu_clk);
+	}
+err_clk_biu:
+	if (!IS_ERR(host->biu_clk)) {
+		clk_disable_unprepare(host->biu_clk);
+		clk_put(host->biu_clk);
+	}
 	return ret;
 }
 EXPORT_SYMBOL(dw_mci_probe);
@@ -2149,6 +2187,12 @@ void dw_mci_remove(struct dw_mci *host)
 		regulator_put(host->vmmc);
 	}
 
+	if (!IS_ERR(host->ciu_clk))
+		clk_disable_unprepare(host->ciu_clk);
+	if (!IS_ERR(host->biu_clk))
+		clk_disable_unprepare(host->biu_clk);
+	clk_put(host->ciu_clk);
+	clk_put(host->biu_clk);
 }
 EXPORT_SYMBOL(dw_mci_remove);
 
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index a37a573..787ad56 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -78,6 +78,8 @@ struct mmc_data;
  * @data_offset: Set the offset of DATA register according to VERID.
  * @dev: Device associated with the MMC controller.
  * @pdata: Platform data associated with the MMC controller.
+ * @biu_clk: Pointer to bus interface unit clock instance.
+ * @ciu_clk: Pointer to card interface unit clock instance.
  * @slot: Slots sharing this MMC controller.
  * @fifo_depth: depth of FIFO.
  * @data_shift: log2 of FIFO item size.
@@ -158,6 +160,8 @@ struct dw_mci {
 	u16			data_offset;
 	struct device		*dev;
 	struct dw_mci_board	*pdata;
+	struct clk		*biu_clk;
+	struct clk		*ciu_clk;
 	struct dw_mci_slot	*slot[MAX_MCI_SLOTS];
 
 	/* FIFO push and pull */
-- 
1.6.6.rc2