[PATCH V4 6/6] spi: mediatek: support hclk

[Leilk Liu]

this patch adds hclk support.

Signed-off-by: Leilk Liu <leilk.liu at mediatek.com>
---
 drivers/spi/spi-mt65xx.c | 85 ++++++++++++++++++++++++++++++++--------
 1 file changed, 69 insertions(+), 16 deletions(-)

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 8958c3fa4fea..d4a602e78aa7 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -130,7 +130,7 @@ struct mtk_spi {
 	u32 state;
 	int pad_num;
 	u32 *pad_sel;
-	struct clk *parent_clk, *sel_clk, *spi_clk;
+	struct clk *parent_clk, *sel_clk, *spi_clk, *spi_hclk;
 	struct spi_transfer *cur_transfer;
 	u32 xfer_len;
 	u32 num_xfered;
@@ -1252,25 +1252,38 @@ static int mtk_spi_probe(struct platform_device *pdev)
 		goto err_put_master;
 	}
 
+	mdata->spi_hclk = devm_clk_get(&pdev->dev, "hclk");
+	if (!IS_ERR(mdata->spi_hclk)) {
+		ret = clk_prepare_enable(mdata->spi_hclk);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "failed to enable hclk (%d)\n", ret);
+			goto err_put_master;
+		}
+	}
+
 	ret = clk_prepare_enable(mdata->spi_clk);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to enable spi_clk (%d)\n", ret);
-		goto err_put_master;
+		goto err_disable_spi_hclk;
 	}
 
 	ret = clk_set_parent(mdata->sel_clk, mdata->parent_clk);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to clk_set_parent (%d)\n", ret);
-		clk_disable_unprepare(mdata->spi_clk);
-		goto err_put_master;
+		goto err_disable_spi_clk;
 	}
 
 	mdata->spi_clk_hz = clk_get_rate(mdata->spi_clk);
 
-	if (mdata->dev_comp->no_need_unprepare)
+	if (mdata->dev_comp->no_need_unprepare) {
 		clk_disable(mdata->spi_clk);
-	else
+		if (!IS_ERR(mdata->spi_hclk))
+			clk_disable(mdata->spi_hclk);
+	} else {
 		clk_disable_unprepare(mdata->spi_clk);
+		if (!IS_ERR(mdata->spi_hclk))
+			clk_disable_unprepare(mdata->spi_hclk);
+	}
 
 	pm_runtime_enable(&pdev->dev);
 
@@ -1310,6 +1323,11 @@ static int mtk_spi_probe(struct platform_device *pdev)
 
 err_disable_runtime_pm:
 	pm_runtime_disable(&pdev->dev);
+err_disable_spi_clk:
+	clk_disable_unprepare(mdata->spi_clk);
+err_disable_spi_hclk:
+	if (!IS_ERR(mdata->spi_hclk))
+		clk_disable_unprepare(mdata->spi_hclk);
 err_put_master:
 	spi_master_put(master);
 
@@ -1325,8 +1343,11 @@ static int mtk_spi_remove(struct platform_device *pdev)
 
 	mtk_spi_reset(mdata);
 
-	if (mdata->dev_comp->no_need_unprepare)
+	if (mdata->dev_comp->no_need_unprepare) {
 		clk_unprepare(mdata->spi_clk);
+		if (!IS_ERR(mdata->spi_hclk))
+			clk_unprepare(mdata->spi_hclk);
+	}
 
 	return 0;
 }
@@ -1342,8 +1363,11 @@ static int mtk_spi_suspend(struct device *dev)
 	if (ret)
 		return ret;
 
-	if (!pm_runtime_suspended(dev))
+	if (!pm_runtime_suspended(dev)) {
 		clk_disable_unprepare(mdata->spi_clk);
+		if (!IS_ERR(mdata->spi_hclk))
+			clk_disable_unprepare(mdata->spi_hclk);
+	}
 
 	return ret;
 }
@@ -1360,11 +1384,23 @@ static int mtk_spi_resume(struct device *dev)
 			dev_err(dev, "failed to enable spi_clk (%d)\n", ret);
 			return ret;
 		}
+
+		if (!IS_ERR(mdata->spi_hclk)) {
+			clk_prepare_enable(mdata->spi_hclk);
+			if (ret < 0) {
+				dev_err(dev, "failed to enable spi_hclk (%d)\n", ret);
+				clk_disable_unprepare(mdata->spi_clk);
+				return ret;
+			}
+		}
 	}
 
 	ret = spi_master_resume(master);
-	if (ret < 0)
+	if (ret < 0) {
 		clk_disable_unprepare(mdata->spi_clk);
+		if (!IS_ERR(mdata->spi_hclk))
+			clk_disable_unprepare(mdata->spi_hclk);
+	}
 
 	return ret;
 }
@@ -1376,10 +1412,15 @@ static int mtk_spi_runtime_suspend(struct device *dev)
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct mtk_spi *mdata = spi_master_get_devdata(master);
 
-	if (mdata->dev_comp->no_need_unprepare)
+	if (mdata->dev_comp->no_need_unprepare) {
 		clk_disable(mdata->spi_clk);
-	else
+		if (!IS_ERR(mdata->spi_hclk))
+			clk_disable(mdata->spi_hclk);
+	} else {
 		clk_disable_unprepare(mdata->spi_clk);
+		if (!IS_ERR(mdata->spi_hclk))
+			clk_disable_unprepare(mdata->spi_hclk);
+	}
 
 	return 0;
 }
@@ -1390,13 +1431,25 @@ static int mtk_spi_runtime_resume(struct device *dev)
 	struct mtk_spi *mdata = spi_master_get_devdata(master);
 	int ret;
 
-	if (mdata->dev_comp->no_need_unprepare)
+	if (mdata->dev_comp->no_need_unprepare) {
 		ret = clk_enable(mdata->spi_clk);
-	else
+		if (!IS_ERR(mdata->spi_hclk))
+			clk_enable(mdata->spi_hclk);
+	} else {
 		ret = clk_prepare_enable(mdata->spi_clk);
-	if (ret < 0) {
-		dev_err(dev, "failed to enable spi_clk (%d)\n", ret);
-		return ret;
+		if (ret < 0) {
+			dev_err(dev, "failed to enable spi_clk (%d)\n", ret);
+			return ret;
+		}
+
+		if (!IS_ERR(mdata->spi_hclk)) {
+			ret = clk_prepare_enable(mdata->spi_hclk);
+			if (ret < 0) {
+				dev_err(dev, "failed to enable spi_hclk (%d)\n", ret);
+				clk_disable_unprepare(mdata->spi_clk);
+				return ret;
+			}
+		}
 	}
 
 	return 0;
-- 
2.25.1