linux-kernel - [RFC PATCH v3 2/4] irqchip/gic: common: add support to device tree based quirks

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Date:   Mon, 12 Nov 2018 10:33:38 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     marc.zyngier@....com
Cc:     sudeep.holla@....com, tglx@...utronix.de, jason@...edaemon.net,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        rnayak@...eaurora.org, sboyd@...nel.org, srini@...nel.org,
        bjorn.andersson@...aro.org, nicolas.dechesne@...aro.org,
        ctatlor97@...il.com, vkoul@...nel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [RFC PATCH v3 2/4] irqchip/gic: common: add support to device tree based quirks

This patch adds support to device tree based quirks based on
device tree compatible string.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/irqchip/irq-gic-common.c | 12 ++++++++++++
 drivers/irqchip/irq-gic-common.h |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c
index 01e673c680cd..3c93c6f4d1f1 100644
--- a/drivers/irqchip/irq-gic-common.c
+++ b/drivers/irqchip/irq-gic-common.c
@@ -36,6 +36,18 @@ void gic_set_kvm_info(const struct gic_kvm_info *info)
 	gic_kvm_info = info;
 }
 
+void gic_enable_of_quirks(const struct device_node *np,
+			  const struct gic_quirk *quirks, void *data)
+{
+	for (; quirks->desc; quirks++) {
+		if (!of_device_is_compatible(np, quirks->compatible))
+			continue;
+		if (quirks->init(data))
+			pr_info("GIC: enabling workaround for %s\n",
+				quirks->desc);
+	}
+}
+
 void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks,
 		void *data)
 {
diff --git a/drivers/irqchip/irq-gic-common.h b/drivers/irqchip/irq-gic-common.h
index 3919cd7c5285..97e58fb6c232 100644
--- a/drivers/irqchip/irq-gic-common.h
+++ b/drivers/irqchip/irq-gic-common.h
@@ -23,6 +23,7 @@
 
 struct gic_quirk {
 	const char *desc;
+	const char *compatible;
 	bool (*init)(void *data);
 	u32 iidr;
 	u32 mask;
@@ -35,6 +36,8 @@ void gic_dist_config(void __iomem *base, int gic_irqs,
 void gic_cpu_config(void __iomem *base, void (*sync_access)(void));
 void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks,
 		void *data);
+void gic_enable_of_quirks(const struct device_node *np,
+			  const struct gic_quirk *quirks, void *data);
 
 void gic_set_kvm_info(const struct gic_kvm_info *info);
 
-- 
2.19.1