[PATCH v2 2/3] i3c: dw: switch to array-based exclusive reset control

[Jisheng Zhang <jszhang@kernel.org>]

The Synopsys DesignWare I3C master controller can have multiple reset
lines, such as a core reset and APB reset.

Refactor the driver to use devm_reset_control_array_get_exclusive()
instead of a single named reset handle. This automatically manages all
resets allocated to the device node sequentially.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
---
 drivers/i3c/master/dw-i3c-master.c | 24 ++++++++++++++++++------
 drivers/i3c/master/dw-i3c-master.h |  2 +-
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index 4563d8761ba0..1c6c870f5bb3 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -1657,6 +1657,11 @@ static const struct dw_i3c_platform_ops dw_i3c_platform_ops_default = {
 	.set_dat_ibi = dw_i3c_platform_set_dat_ibi_nop,
 };
 
+static void dw_i3c_resets_assert(void *data)
+{
+	reset_control_assert(data);
+}
+
 int dw_i3c_common_probe(struct dw_i3c_master *master,
 			struct platform_device *pdev)
 {
@@ -1696,10 +1701,17 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
 	if (IS_ERR(master->pclk))
 		return PTR_ERR(master->pclk);
 
-	master->core_rst = devm_reset_control_get_optional_exclusive_deasserted(&pdev->dev,
-										NULL);
-	if (IS_ERR(master->core_rst))
-		return PTR_ERR(master->core_rst);
+	master->resets = devm_reset_control_array_get_optional_exclusive(&pdev->dev);
+	if (IS_ERR(master->resets))
+		return PTR_ERR(master->resets);
+
+	ret = reset_control_deassert(master->resets);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action_or_reset(&pdev->dev, dw_i3c_resets_assert, master->resets);
+	if (ret)
+		return ret;
 
 	spin_lock_init(&master->xferqueue.lock);
 	INIT_LIST_HEAD(&master->xferqueue.list);
@@ -1873,7 +1885,7 @@ static int __maybe_unused dw_i3c_master_runtime_suspend(struct device *dev)
 
 	dw_i3c_master_disable(master);
 
-	reset_control_assert(master->core_rst);
+	reset_control_assert(master->resets);
 	dw_i3c_master_disable_clks(master);
 	pinctrl_pm_select_sleep_state(dev);
 	return 0;
@@ -1885,7 +1897,7 @@ static int __maybe_unused dw_i3c_master_runtime_resume(struct device *dev)
 
 	pinctrl_pm_select_default_state(dev);
 	dw_i3c_master_enable_clks(master);
-	reset_control_deassert(master->core_rst);
+	reset_control_deassert(master->resets);
 
 	dw_i3c_master_set_intr_regs(master);
 	dw_i3c_master_restore_timing_regs(master);
diff --git a/drivers/i3c/master/dw-i3c-master.h b/drivers/i3c/master/dw-i3c-master.h
index 17ad817d1f8e..f5b4491b247a 100644
--- a/drivers/i3c/master/dw-i3c-master.h
+++ b/drivers/i3c/master/dw-i3c-master.h
@@ -36,7 +36,7 @@ struct dw_i3c_master {
 	} xferqueue;
 	struct dw_i3c_master_caps caps;
 	void __iomem *regs;
-	struct reset_control *core_rst;
+	struct reset_control *resets;
 	struct clk *core_clk;
 	struct clk *pclk;
 	char version[5];
-- 
2.53.0