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[Xen-devel] [PATCH for 4.6 09/13] xen/arm: Describe device supported by a driver with dt_match_node



Xen is currently using list a compatible string to know if the driver
can use device node. This leads to have double definition in the GIC
code.

Futhermore Linux drivers is using dt_match_node (actually called of_device_id
in Linux) to list device supported by the drivers.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/device.c              | 21 ++-------------------
 xen/arch/arm/gic-v2.c              | 10 ++++------
 xen/arch/arm/gic-v3.c              |  8 ++++----
 xen/drivers/char/exynos4210-uart.c |  8 ++++----
 xen/drivers/char/ns16550.c         | 12 ++++++------
 xen/drivers/char/omap-uart.c       |  8 ++++----
 xen/drivers/char/pl011.c           |  8 ++++----
 xen/include/asm-arm/device.h       |  8 ++++++--
 xen/include/asm-arm/gic.h          | 15 +++++----------
 9 files changed, 39 insertions(+), 59 deletions(-)

diff --git a/xen/arch/arm/device.c b/xen/arch/arm/device.c
index de702ff..1993929 100644
--- a/xen/arch/arm/device.c
+++ b/xen/arch/arm/device.c
@@ -23,23 +23,6 @@
 
 extern const struct device_desc _sdevice[], _edevice[];
 
-static bool_t __init device_is_compatible(const struct device_desc *desc,
-                                          const struct dt_device_node *dev)
-{
-    const char *const *compat;
-
-    if ( !desc->compatible )
-        return 0;
-
-    for ( compat = desc->compatible; *compat; compat++ )
-    {
-        if ( dt_device_is_compatible(dev, *compat) )
-            return 1;
-    }
-
-    return 0;
-}
-
 int __init device_init(struct dt_device_node *dev, enum device_match type,
                        const void *data)
 {
@@ -55,7 +38,7 @@ int __init device_init(struct dt_device_node *dev, enum 
device_match type,
         if ( desc->type != type )
             continue;
 
-        if ( device_is_compatible(desc, dev) )
+        if ( dt_match_node(desc->dt_match, dev) )
         {
             ASSERT(desc->init != NULL);
 
@@ -75,7 +58,7 @@ enum device_match device_get_type(const struct dt_device_node 
*dev)
 
     for ( desc = _sdevice; desc != _edevice; desc++ )
     {
-        if ( device_is_compatible(desc, dev) )
+        if ( dt_match_node(desc->dt_match, dev) )
             return desc->type;
     }
 
diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
index 048350b..db3795d 100644
--- a/xen/arch/arm/gic-v2.c
+++ b/xen/arch/arm/gic-v2.c
@@ -763,16 +763,14 @@ static int __init gicv2_init(struct dt_device_node *node, 
const void *data)
     return 0;
 }
 
-static const char * const gicv2_dt_compat[] __initconst =
+static const struct dt_device_match gicv2_dt_match[] __initconst =
 {
-    DT_COMPAT_GIC_CORTEX_A15,
-    DT_COMPAT_GIC_CORTEX_A7,
-    DT_COMPAT_GIC_400,
-    NULL
+    DT_MATCH_GIC_V2,
+    { /* sentinel */ },
 };
 
 DT_DEVICE_START(gicv2, "GICv2", DEVICE_GIC)
-        .compatible = gicv2_dt_compat,
+        .dt_match = gicv2_dt_match,
         .init = gicv2_init,
 DT_DEVICE_END
 
diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index c6d1876..1191cb7 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1278,14 +1278,14 @@ static int __init gicv3_init(struct dt_device_node 
*node, const void *data)
     return res;
 }
 
-static const char * const gicv3_dt_compat[] __initconst =
+static const struct dt_device_match gicv3_dt_match[] __initconst =
 {
-    DT_COMPAT_GIC_V3,
-    NULL
+    DT_MATCH_GIC_V3,
+    { /* sentinel */ },
 };
 
 DT_DEVICE_START(gicv3, "GICv3", DEVICE_GIC)
-        .compatible = gicv3_dt_compat,
+        .dt_match = gicv3_dt_match,
         .init = gicv3_init,
 DT_DEVICE_END
 
diff --git a/xen/drivers/char/exynos4210-uart.c 
b/xen/drivers/char/exynos4210-uart.c
index 75246e1..b59e64a 100644
--- a/xen/drivers/char/exynos4210-uart.c
+++ b/xen/drivers/char/exynos4210-uart.c
@@ -352,14 +352,14 @@ static int __init exynos4210_uart_init(struct 
dt_device_node *dev,
     return 0;
 }
 
-static const char * const exynos4210_dt_compat[] __initconst =
+static const struct dt_device_match exynos4210_dt_match[] __initconst =
 {
-    "samsung,exynos4210-uart",
-    NULL
+    DT_MATCH_COMPATIBLE("samsung,exynos4210-uart"),
+    { /* sentinel */ },
 };
 
 DT_DEVICE_START(exynos4210, "Exynos 4210 UART", DEVICE_SERIAL)
-        .compatible = exynos4210_dt_compat,
+        .dt_match = exynos4210_dt_match,
         .init = exynos4210_uart_init,
 DT_DEVICE_END
 
diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c
index 6df3f95..a0373a9 100644
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -1185,16 +1185,16 @@ static int __init ns16550_uart_dt_init(struct 
dt_device_node *dev,
     return 0;
 }
 
-static const char * const ns16550_dt_compat[] __initconst =
+static const struct dt_device_match ns16550_dt_match[] __initconst =
 {
-    "ns16550",
-    "ns16550a",
-    "snps,dw-apb-uart",
-    NULL
+    DT_MATCH_COMPATIBLE("ns16550"),
+    DT_MATCH_COMPATIBLE("ns16550a"),
+    DT_MATCH_COMPATIBLE("snps,dw-apb-uart"),
+    { /* sentinel */ },
 };
 
 DT_DEVICE_START(ns16550, "NS16550 UART", DEVICE_SERIAL)
-        .compatible = ns16550_dt_compat,
+        .dt_match = ns16550_dt_match,
         .init = ns16550_uart_dt_init,
 DT_DEVICE_END
 
diff --git a/xen/drivers/char/omap-uart.c b/xen/drivers/char/omap-uart.c
index c4cd442..3df80cf 100644
--- a/xen/drivers/char/omap-uart.c
+++ b/xen/drivers/char/omap-uart.c
@@ -350,14 +350,14 @@ static int __init omap_uart_init(struct dt_device_node 
*dev,
     return 0;
 }
 
-static const char * const omap_uart_dt_compat[] __initconst =
+static const struct dt_device_match omap_uart_dt_match[] __initconst =
 {
-    "ti,omap4-uart",
-    NULL
+    DT_MATCH_COMPATIBLE("ti,omap4-uart"),
+    { /* sentinel */ },
 };
 
 DT_DEVICE_START(omap_uart, "OMAP UART", DEVICE_SERIAL)
-    .compatible = omap_uart_dt_compat,
+    .dt_match = omap_uart_dt_match,
     .init = omap_uart_init,
 DT_DEVICE_END
 
diff --git a/xen/drivers/char/pl011.c b/xen/drivers/char/pl011.c
index cc91224..e6ecf0b 100644
--- a/xen/drivers/char/pl011.c
+++ b/xen/drivers/char/pl011.c
@@ -269,14 +269,14 @@ static int __init pl011_uart_init(struct dt_device_node 
*dev,
     return 0;
 }
 
-static const char * const pl011_dt_compat[] __initconst =
+static const struct dt_device_match pl011_dt_match[] __initconst =
 {
-    "arm,pl011",
-    NULL
+    DT_MATCH_COMPATIBLE("arm,pl011"),
+    { /* sentinel */ },
 };
 
 DT_DEVICE_START(pl011, "PL011 UART", DEVICE_SERIAL)
-        .compatible = pl011_dt_compat,
+        .dt_match = pl011_dt_match,
         .init = pl011_uart_init,
 DT_DEVICE_END
 
diff --git a/xen/include/asm-arm/device.h b/xen/include/asm-arm/device.h
index fdcd097..a2711a3 100644
--- a/xen/include/asm-arm/device.h
+++ b/xen/include/asm-arm/device.h
@@ -3,6 +3,10 @@
 
 #include <xen/init.h>
 
+struct dev_archdata {
+    void *iommu;    /* IOMMU private data */
+};
+
 struct dt_device_node;
 
 enum device_match
@@ -19,8 +23,8 @@ struct device_desc {
     const char *name;
     /* Device type */
     enum device_match type;
-    /* Array of device tree 'compatible' strings */
-    const char *const *compatible;
+    /* List of devices supported by this driver */
+    const struct dt_device_match *dt_match;
     /* Device initialization */
     int (*init)(struct dt_device_node *dev, const void *data);
 };
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 187dc46..73ca3cf 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -152,17 +152,12 @@
 #include <xen/irq.h>
 #include <asm-arm/vgic.h>
 
-#define DT_COMPAT_GIC_400            "arm,gic-400"
-#define DT_COMPAT_GIC_CORTEX_A15     "arm,cortex-a15-gic"
-#define DT_COMPAT_GIC_CORTEX_A7      "arm,cortex-a7-gic"
+#define DT_MATCH_GIC_V2                                             \
+    DT_MATCH_COMPATIBLE("arm,cortex-a15-gic"),                      \
+    DT_MATCH_COMPATIBLE("arm,cortex-a7-gic"),                       \
+    DT_MATCH_COMPATIBLE("arm,gic-400")
 
-#define DT_MATCH_GIC_V2 DT_MATCH_COMPATIBLE(DT_COMPAT_GIC_CORTEX_A15), \
-                        DT_MATCH_COMPATIBLE(DT_COMPAT_GIC_CORTEX_A7), \
-                        DT_MATCH_COMPATIBLE(DT_COMPAT_GIC_400)
-
-#define DT_COMPAT_GIC_V3             "arm,gic-v3"
-
-#define DT_MATCH_GIC_V3 DT_MATCH_COMPATIBLE(DT_COMPAT_GIC_V3)
+#define DT_MATCH_GIC_V3 DT_MATCH_COMPATIBLE("arm,gic-v3")
 
 /*
  * GICv3 registers that needs to be saved/restored
-- 
2.1.3


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