[PATCH v5 2/4] irqchip/gic: common: add support to device tree based quirks

[Srinivas Kandagatla]

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

Signed-off-by: Srinivas Kandagatla <srinivas.kandaga...@linaro.org>
---
 drivers/irqchip/irq-gic-common.c | 12 ++++++++++++
 drivers/irqchip/irq-gic-common.h |  3 +++
 drivers/irqchip/irq-gic-v3.c     |  7 +++++++
 3 files changed, 22 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);
 
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 29e9d47be97d..df1ff3b5836a 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1271,6 +1271,11 @@ static void __init gic_of_setup_kvm_info(struct 
device_node *node)
        gic_set_kvm_info(&gic_v3_kvm_info);
 }
 
+static const struct gic_quirk gic_quirks[] = {
+       {
+       }
+};
+
 static int __init gic_of_init(struct device_node *node, struct device_node 
*parent)
 {
        void __iomem *dist_base;
@@ -1318,6 +1323,8 @@ static int __init gic_of_init(struct device_node *node, 
struct device_node *pare
        if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
                redist_stride = 0;
 
+       gic_enable_of_quirks(node, gic_quirks, &gic_data);
+
        err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions,
                             redist_stride, &node->fwnode);
        if (err)
-- 
2.19.2