Hi,

We need to revisited this driver, I have tried to run kernel with sysreg and got failure. Here is the reason:
[...]
static void __iomem *vexpress_sysreg_base(void)
{
        if (!__vexpress_sysreg_base) {
                struct device_node *node = of_find_compatible_node(NULL, NULL,
                                "arm,vexpress-sysreg");

                __vexpress_sysreg_base = of_iomap(node, 0);
        }

        WARN_ON(!__vexpress_sysreg_base);

        return __vexpress_sysreg_base;
}
[...]

So sysreg still tries to obtain info from FDT while now we are using pure ACPI kernel.

Regards,
Tomasz

On 23.10.2013 13:23, naresh.bhat@linaro.org wrote:

From: Naresh Bhat <naresh.bhat@linaro.org>

Add match table and pointers for ACPI probing into vexpress-sysreg driver.

Signed-off-by: Naresh Bhat <naresh.bhat@linaro.org>
---
  drivers/mfd/vexpress-sysreg.c |    9 +++++++++
  1 file changed, 9 insertions(+)

diff --git a/drivers/mfd/vexpress-sysreg.c b/drivers/mfd/vexpress-sysreg.c
index 981bef4..9e39075 100644
--- a/drivers/mfd/vexpress-sysreg.c
+++ b/drivers/mfd/vexpress-sysreg.c
@@ -22,6 +22,7 @@
  #include <linux/stat.h>
  #include <linux/timer.h>
  #include <linux/vexpress.h>
+#include <linux/acpi.h>

  #define SYS_ID                        0x000
  #define SYS_SW                        0x004
@@ -512,10 +513,18 @@ static const struct of_device_id vexpress_sysreg_match[] = {
        {},
  };

+#ifdef CONFIG_ACPI
+static const struct acpi_device_id vexpress_sysreg_acpi_match[] = {
+       { "LINA0009", },
+       { }
+};
+#endif
+
  static struct platform_driver vexpress_sysreg_driver = {
        .driver = {
                .name = "vexpress-sysreg",
                .of_match_table = vexpress_sysreg_match,
+               .acpi_match_table = ACPI_PTR(vexpress_sysreg_acpi_match),
        },
        .probe = vexpress_sysreg_probe,
  };