linux-kernel - [PATCH 3/3] i3c: ast2600: Add reset deassertion for global registers

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Date:   Tue, 8 Aug 2023 23:42:41 +0800
From:   Dylan Hung <dylan_hung@...eedtech.com>
To:     <jk@...econstruct.com.au>, <alexandre.belloni@...tlin.com>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <joel@....id.au>, <andrew@...id.au>,
        <p.zabel@...gutronix.de>, <linux-i3c@...ts.infradead.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-aspeed@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
CC:     <BMC-SW@...eedtech.com>, <kobedylan@...il.com>
Subject: [PATCH 3/3] i3c: ast2600: Add reset deassertion for global registers

Add missing reset deassertion of the I3C global control registers.

Signed-off-by: Dylan Hung <dylan_hung@...eedtech.com>
---
 drivers/i3c/master/ast2600-i3c-master.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/i3c/master/ast2600-i3c-master.c b/drivers/i3c/master/ast2600-i3c-master.c
index 09ed19d489e9..5d9d060134e0 100644
--- a/drivers/i3c/master/ast2600-i3c-master.c
+++ b/drivers/i3c/master/ast2600-i3c-master.c
@@ -11,6 +11,7 @@
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
+#include <linux/reset.h>
 
 #include "dw-i3c-master.h"
 
@@ -128,6 +129,7 @@ static int ast2600_i3c_probe(struct platform_device *pdev)
 	struct device_node *np = pdev->dev.of_node;
 	struct of_phandle_args gspec;
 	struct ast2600_i3c *i3c;
+	struct reset_control *rst;
 	int rc;
 
 	i3c = devm_kzalloc(&pdev->dev, sizeof(*i3c), GFP_KERNEL);
@@ -156,6 +158,13 @@ static int ast2600_i3c_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "invalid sda-pullup value %d\n",
 			i3c->sda_pullup);
 
+	rst = devm_reset_control_get_shared(&pdev->dev, "global_rst");
+	if (IS_ERR(rst)) {
+		dev_err(&pdev->dev, "missing of invalid reset entry");
+		return PTR_ERR(rst);
+	}
+	reset_control_deassert(rst);
+
 	i3c->dw.platform_ops = &ast2600_i3c_ops;
 	i3c->dw.ibi_capable = true;
 	return dw_i3c_common_probe(&i3c->dw, pdev);
-- 
2.25.1