[PATCH -next 19/25] spi: mtk-snfi: Use helper function devm_clk_get_enabled()

[Li Zetao]

Since commit 7ef9651e9792 ("clk: Provide new devm_clk helpers for prepared
and enabled clocks"), devm_clk_get() and clk_prepare_enable() can now be
replaced by devm_clk_get_enabled() when driver enables (and possibly
prepares) the clocks for the whole lifetime of the device. Moreover, it is
no longer necessary to unprepare and disable the clocks explicitly.
Also, devm_clk_get_optional() and clk_prepare_enable() can now be
replaced by devm_clk_get_optional_enabled().Moreover, the two functions
mtk_snand_enable_clk() and mtk_snand_disable_clk() no longer are used,
drop them for clean code.

Signed-off-by: Li Zetao <lizetao1 at huawei.com>
---
 drivers/spi/spi-mtk-snfi.c | 61 ++++++--------------------------------
 1 file changed, 9 insertions(+), 52 deletions(-)

diff --git a/drivers/spi/spi-mtk-snfi.c b/drivers/spi/spi-mtk-snfi.c
index 4433a8a9299f..8ad5a4764855 100644
--- a/drivers/spi/spi-mtk-snfi.c
+++ b/drivers/spi/spi-mtk-snfi.c
@@ -1332,42 +1332,6 @@ static const struct of_device_id mtk_snand_ids[] = {
 
 MODULE_DEVICE_TABLE(of, mtk_snand_ids);
 
-static int mtk_snand_enable_clk(struct mtk_snand *ms)
-{
-	int ret;
-
-	ret = clk_prepare_enable(ms->nfi_clk);
-	if (ret) {
-		dev_err(ms->dev, "unable to enable nfi clk\n");
-		return ret;
-	}
-	ret = clk_prepare_enable(ms->pad_clk);
-	if (ret) {
-		dev_err(ms->dev, "unable to enable pad clk\n");
-		goto err1;
-	}
-	ret = clk_prepare_enable(ms->nfi_hclk);
-	if (ret) {
-		dev_err(ms->dev, "unable to enable nfi hclk\n");
-		goto err2;
-	}
-
-	return 0;
-
-err2:
-	clk_disable_unprepare(ms->pad_clk);
-err1:
-	clk_disable_unprepare(ms->nfi_clk);
-	return ret;
-}
-
-static void mtk_snand_disable_clk(struct mtk_snand *ms)
-{
-	clk_disable_unprepare(ms->nfi_hclk);
-	clk_disable_unprepare(ms->pad_clk);
-	clk_disable_unprepare(ms->nfi_clk);
-}
-
 static int mtk_snand_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -1406,49 +1370,45 @@ static int mtk_snand_probe(struct platform_device *pdev)
 
 	ms->dev = &pdev->dev;
 
-	ms->nfi_clk = devm_clk_get(&pdev->dev, "nfi_clk");
+	ms->nfi_clk = devm_clk_get_enabled(&pdev->dev, "nfi_clk");
 	if (IS_ERR(ms->nfi_clk)) {
 		ret = PTR_ERR(ms->nfi_clk);
 		dev_err(&pdev->dev, "unable to get nfi_clk, err = %d\n", ret);
 		goto release_ecc;
 	}
 
-	ms->pad_clk = devm_clk_get(&pdev->dev, "pad_clk");
+	ms->pad_clk = devm_clk_get_enabled(&pdev->dev, "pad_clk");
 	if (IS_ERR(ms->pad_clk)) {
 		ret = PTR_ERR(ms->pad_clk);
 		dev_err(&pdev->dev, "unable to get pad_clk, err = %d\n", ret);
 		goto release_ecc;
 	}
 
-	ms->nfi_hclk = devm_clk_get_optional(&pdev->dev, "nfi_hclk");
+	ms->nfi_hclk = devm_clk_get_optional_enabled(&pdev->dev, "nfi_hclk");
 	if (IS_ERR(ms->nfi_hclk)) {
 		ret = PTR_ERR(ms->nfi_hclk);
 		dev_err(&pdev->dev, "unable to get nfi_hclk, err = %d\n", ret);
 		goto release_ecc;
 	}
 
-	ret = mtk_snand_enable_clk(ms);
-	if (ret)
-		goto release_ecc;
-
 	init_completion(&ms->op_done);
 
 	ms->irq = platform_get_irq(pdev, 0);
 	if (ms->irq < 0) {
 		ret = ms->irq;
-		goto disable_clk;
+		goto release_ecc;
 	}
 	ret = devm_request_irq(ms->dev, ms->irq, mtk_snand_irq, 0x0,
 			       "mtk-snand", ms);
 	if (ret) {
 		dev_err(ms->dev, "failed to request snfi irq\n");
-		goto disable_clk;
+		goto release_ecc;
 	}
 
 	ret = dma_set_mask(ms->dev, DMA_BIT_MASK(32));
 	if (ret) {
 		dev_err(ms->dev, "failed to set dma mask\n");
-		goto disable_clk;
+		goto release_ecc;
 	}
 
 	// switch to SNFI mode
@@ -1472,7 +1432,7 @@ static int mtk_snand_probe(struct platform_device *pdev)
 	ret = mtk_snand_setup_pagefmt(ms, SZ_2K, SZ_64);
 	if (ret) {
 		dev_err(ms->dev, "failed to set initial page format\n");
-		goto disable_clk;
+		goto release_ecc;
 	}
 
 	// setup ECC engine
@@ -1484,7 +1444,7 @@ static int mtk_snand_probe(struct platform_device *pdev)
 	ret = nand_ecc_register_on_host_hw_engine(&ms->ecc_eng);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register ecc engine.\n");
-		goto disable_clk;
+		goto release_ecc;
 	}
 
 	ctlr->num_chipselect = 1;
@@ -1496,12 +1456,10 @@ static int mtk_snand_probe(struct platform_device *pdev)
 	ret = spi_register_controller(ctlr);
 	if (ret) {
 		dev_err(&pdev->dev, "spi_register_controller failed.\n");
-		goto disable_clk;
+		goto release_ecc;
 	}
 
 	return 0;
-disable_clk:
-	mtk_snand_disable_clk(ms);
 release_ecc:
 	mtk_ecc_release(ms->ecc);
 	return ret;
@@ -1513,7 +1471,6 @@ static void mtk_snand_remove(struct platform_device *pdev)
 	struct mtk_snand *ms = spi_controller_get_devdata(ctlr);
 
 	spi_unregister_controller(ctlr);
-	mtk_snand_disable_clk(ms);
 	mtk_ecc_release(ms->ecc);
 	kfree(ms->buf);
 }
-- 
2.34.1