linux-kernel - [PATCH v3 3/3] irqchip: Allow QCOM_PDC to be loadable as a permanent module

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Message-Id: <20200710231824.60699-4-john.stultz@linaro.org>
Date:   Fri, 10 Jul 2020 23:18:24 +0000
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Maulik Shah <mkshah@...eaurora.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Todd Kjos <tkjos@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-gpio@...r.kernel.org
Subject: [PATCH v3 3/3] irqchip: Allow QCOM_PDC to be loadable as a permanent module

Allows qcom-pdc driver to be loaded as a permanent module

Also, due to the fact that IRQCHIP_DECLARE becomes a no-op when
building as a module, we have to replace it with platform driver
hooks explicitly.

Thanks to Saravana for his help on pointing out the
IRQCHIP_DECLARE issue and guidance on a solution.

Cc: Andy Gross <agross@...nel.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Marc Zyngier <maz@...nel.org>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Maulik Shah <mkshah@...eaurora.org>
Cc: Lina Iyer <ilina@...eaurora.org>
Cc: Saravana Kannan <saravanak@...gle.com>
Cc: Todd Kjos <tkjos@...gle.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-arm-msm@...r.kernel.org
Cc: iommu@...ts.linux-foundation.org
Cc: linux-gpio@...r.kernel.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
v2: Fix spelling, include order and set suppress_bind_attrs
    suggested by Maulik Shah

v3: Drop conditional usage of IRQCHIP_DECLARE as suggested
    by Stephen Boyd and Marc Zyngier
---
 drivers/irqchip/Kconfig    |  2 +-
 drivers/irqchip/qcom-pdc.c | 28 +++++++++++++++++++++++++++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 216b3b8392b5..cc285c1a54c1 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -425,7 +425,7 @@ config GOLDFISH_PIC
          for Goldfish based virtual platforms.
 
 config QCOM_PDC
-	bool "QCOM PDC"
+	tristate "QCOM PDC"
 	depends on ARCH_QCOM
 	select IRQ_DOMAIN_HIERARCHY
 	help
diff --git a/drivers/irqchip/qcom-pdc.c b/drivers/irqchip/qcom-pdc.c
index 6ae9e1f0819d..5b624e3295e4 100644
--- a/drivers/irqchip/qcom-pdc.c
+++ b/drivers/irqchip/qcom-pdc.c
@@ -11,9 +11,11 @@
 #include <linux/irqdomain.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
+#include <linux/of_irq.h>
 #include <linux/soc/qcom/irq.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
@@ -430,4 +432,28 @@ static int qcom_pdc_init(struct device_node *node, struct device_node *parent)
 	return ret;
 }
 
-IRQCHIP_DECLARE(qcom_pdc, "qcom,pdc", qcom_pdc_init);
+static int qcom_pdc_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *parent = of_irq_find_parent(np);
+
+	return qcom_pdc_init(np, parent);
+}
+
+static const struct of_device_id qcom_pdc_match_table[] = {
+	{ .compatible = "qcom,pdc" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, qcom_pdc_match_table);
+
+static struct platform_driver qcom_pdc_driver = {
+	.probe = qcom_pdc_probe,
+	.driver = {
+		.name = "qcom-pdc",
+		.of_match_table = qcom_pdc_match_table,
+		.suppress_bind_attrs = true,
+	},
+};
+module_platform_driver(qcom_pdc_driver);
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Power Domain Controller");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1