[PATCH v3 2/6] soc: mediatek: mtk-devapc: refine DEVAPC clock control

[Xiaoshun Xu <xiaoshun.xu@mediatek.com>]

Because the new DEVAPC design, DEVAPC clock is controlled by
HW power domains, the control flow of DEVAPC clock is not
necessary, but to maintain compatibility with legacy ICs,
keep this part of code.

Signed-off-by: Xiaoshun Xu <xiaoshun.xu@mediatek.com>
---
 drivers/soc/mediatek/mtk-devapc.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-devapc.c b/drivers/soc/mediatek/mtk-devapc.c
index c9e1401315ad..f54e310791e5 100644
--- a/drivers/soc/mediatek/mtk-devapc.c
+++ b/drivers/soc/mediatek/mtk-devapc.c
@@ -284,16 +284,28 @@ static int mtk_devapc_probe(struct platform_device *pdev)
 		goto err;
 	}
 
-	ctx->infra_clk = devm_clk_get_enabled(&pdev->dev, "devapc-infra-clock");
+	/*
+	 * The new design of DAPC clock is controlled by HW power domains,
+	 * making it unnecessary to provide the clock control driver.
+	 */
+	ctx->infra_clk = devm_clk_get_optional(&pdev->dev, "devapc-infra-clock");
 	if (IS_ERR(ctx->infra_clk)) {
-		ret = -EINVAL;
-		goto err;
+		dev_err(ctx->dev, "Cannot get devapc clock from CCF\n");
+		ctx->infra_clk = NULL;
+	} else {
+		if (clk_prepare_enable(ctx->infra_clk)) {
+			ret = -EINVAL;
+			goto err;
+		}
 	}
 
 	ret = devm_request_irq(&pdev->dev, devapc_irq, devapc_violation_irq,
-			       IRQF_TRIGGER_NONE, "devapc", ctx);
-	if (ret)
+			       IRQF_TRIGGER_NONE | IRQF_SHARED, "devapc", ctx);
+	if (ret) {
+		if (ctx->infra_clk)
+			clk_disable_unprepare(ctx->infra_clk);
 		goto err;
+	}
 
 	platform_set_drvdata(pdev, ctx);
 
@@ -311,6 +323,9 @@ static void mtk_devapc_remove(struct platform_device *pdev)
 	struct mtk_devapc_context *ctx = platform_get_drvdata(pdev);
 
 	stop_devapc(ctx);
+
+	clk_disable_unprepare(ctx->infra_clk);
+
 	iounmap(ctx->infra_base);
 }
 
-- 
2.45.2