linux-kernel - [PATCH v1 2/2] spmi: pmic-arb: make interrupt support optional

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Date:   Fri, 23 Sep 2022 15:49:39 +0800
From:   Fenglin Wu <quic_fenglinw@...cinc.com>
To:     <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sboyd@...nel.org>
CC:     <quic_collinsd@...cinc.com>, <quic_subbaram@...cinc.com>,
        <quic_fenglinw@...cinc.com>,
        David Collins <collinsd@...eaurora.org>
Subject: [PATCH v1 2/2] spmi: pmic-arb: make interrupt support optional

From: David Collins <collinsd@...eaurora.org>

Make the support of PMIC peripheral interrupts optional for
spmi-pmic-arb devices.  This is useful in situations where
SPMI address mapping is required without the need for IRQ
support.

Signed-off-by: David Collins <collinsd@...eaurora.org>
Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.com>
---
 drivers/spmi/spmi-pmic-arb.c | 45 ++++++++++++++++++++++--------------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 1e7f5a9ff4bc..c14cffd8a313 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -1490,10 +1490,12 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 		goto err_put_ctrl;
 	}
 
-	pmic_arb->irq = platform_get_irq_byname(pdev, "periph_irq");
-	if (pmic_arb->irq < 0) {
-		err = pmic_arb->irq;
-		goto err_put_ctrl;
+	if (of_find_property(pdev->dev.of_node, "interrupt-controller", NULL)) {
+		pmic_arb->irq = platform_get_irq_byname(pdev, "periph_irq");
+		if (pmic_arb->irq < 0) {
+			err = pmic_arb->irq;
+			goto err_put_ctrl;
+		}
 	}
 
 	err = of_property_read_u32(pdev->dev.of_node, "qcom,channel", &channel);
@@ -1553,17 +1555,22 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 		}
 	}
 
-	dev_dbg(&pdev->dev, "adding irq domain\n");
-	pmic_arb->domain = irq_domain_add_tree(pdev->dev.of_node,
-					 &pmic_arb_irq_domain_ops, pmic_arb);
-	if (!pmic_arb->domain) {
-		dev_err(&pdev->dev, "unable to create irq_domain\n");
-		err = -ENOMEM;
-		goto err_put_ctrl;
+	if (pmic_arb->irq > 0) {
+		dev_dbg(&pdev->dev, "adding irq domain\n");
+		pmic_arb->domain = irq_domain_add_tree(pdev->dev.of_node,
+					    &pmic_arb_irq_domain_ops, pmic_arb);
+		if (!pmic_arb->domain) {
+			dev_err(&pdev->dev, "unable to create irq_domain\n");
+			err = -ENOMEM;
+			goto err_put_ctrl;
+		}
+
+		irq_set_chained_handler_and_data(pmic_arb->irq,
+						pmic_arb_chained_irq, pmic_arb);
+	} else {
+		dev_dbg(&pdev->dev, "not supporting PMIC interrupts\n");
 	}
 
-	irq_set_chained_handler_and_data(pmic_arb->irq, pmic_arb_chained_irq,
-					pmic_arb);
 	err = spmi_controller_add(ctrl);
 	if (err)
 		goto err_domain_remove;
@@ -1571,8 +1578,10 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 	return 0;
 
 err_domain_remove:
-	irq_set_chained_handler_and_data(pmic_arb->irq, NULL, NULL);
-	irq_domain_remove(pmic_arb->domain);
+	if (pmic_arb->irq > 0) {
+		irq_set_chained_handler_and_data(pmic_arb->irq, NULL, NULL);
+		irq_domain_remove(pmic_arb->domain);
+	}
 err_put_ctrl:
 	spmi_controller_put(ctrl);
 	return err;
@@ -1583,8 +1592,10 @@ static int spmi_pmic_arb_remove(struct platform_device *pdev)
 	struct spmi_controller *ctrl = platform_get_drvdata(pdev);
 	struct spmi_pmic_arb *pmic_arb = spmi_controller_get_drvdata(ctrl);
 	spmi_controller_remove(ctrl);
-	irq_set_chained_handler_and_data(pmic_arb->irq, NULL, NULL);
-	irq_domain_remove(pmic_arb->domain);
+	if (pmic_arb->irq > 0) {
+		irq_set_chained_handler_and_data(pmic_arb->irq, NULL, NULL);
+		irq_domain_remove(pmic_arb->domain);
+	}
 	spmi_controller_put(ctrl);
 	return 0;
 }
-- 
2.25.1