linux-kernel - [PATCH v2 2/3] i3c: dw: Add optional apb clock

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Date: Mon, 24 Jun 2024 05:28:50 +0000
From: Aniket <aniketmaurya@...gle.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>, Jeremy Kerr <jk@...econstruct.com.au>, 
	Joel Stanley <joel@....id.au>, Billy Tsai <billy_tsai@...eedtech.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, Aniket <aniketmaurya@...gle.com>
Subject: [PATCH v2 2/3] i3c: dw: Add optional apb clock

Besides the core clock, IP also has an apb interface clock.
Add an optional hook for the same and appropriately enable/disable.

Signed-off-by: Aniket <aniketmaurya@...gle.com>
---
 drivers/i3c/master/dw-i3c-master.c | 12 ++++++++++++
 drivers/i3c/master/dw-i3c-master.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index 77a2a1c3fd1d..41cdfd6741e3 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -1470,12 +1470,20 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
 	if (IS_ERR(master->core_clk))
 		return PTR_ERR(master->core_clk);
 
+	master->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
+	if (IS_ERR(master->pclk))
+		return PTR_ERR(master->pclk);
+
 	master->core_rst = devm_reset_control_get_optional_exclusive(&pdev->dev,
 								    "core_rst");
 	if (IS_ERR(master->core_rst))
 		return PTR_ERR(master->core_rst);
 
 	ret = clk_prepare_enable(master->core_clk);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(master->pclk);
 	if (ret)
 		goto err_disable_core_clk;
 
@@ -1520,6 +1528,8 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
 err_assert_rst:
 	reset_control_assert(master->core_rst);
 
+	clk_disable_unprepare(master->pclk);
+
 err_disable_core_clk:
 	clk_disable_unprepare(master->core_clk);
 
@@ -1533,6 +1543,8 @@ void dw_i3c_common_remove(struct dw_i3c_master *master)
 
 	reset_control_assert(master->core_rst);
 
+	clk_disable_unprepare(master->pclk);
+
 	clk_disable_unprepare(master->core_clk);
 }
 EXPORT_SYMBOL_GPL(dw_i3c_common_remove);
diff --git a/drivers/i3c/master/dw-i3c-master.h b/drivers/i3c/master/dw-i3c-master.h
index 8cb617b8147e..50c38e790c0e 100644
--- a/drivers/i3c/master/dw-i3c-master.h
+++ b/drivers/i3c/master/dw-i3c-master.h
@@ -36,6 +36,7 @@ struct dw_i3c_master {
 	void __iomem *regs;
 	struct reset_control *core_rst;
 	struct clk *core_clk;
+	struct clk *pclk;
 	char version[5];
 	char type[5];
 	bool ibi_capable;
-- 
2.45.2.741.gdbec12cfda-goog