firmware: PSCI: Fix PSCI support for OF live trees

When CONFIG_OF_LIVE is enabled, dev_of_offset() cannot be used and
if used returns an invalid offset. This causes the call to
fdt_stringlist_get() in the psci_probe() to fail to read the 'method'
property from the PSCI node for the device and hence prevents PSCI
from working. Fix this by using the ofnode_read_string() API instead
of the fdt_stringlist_get() because this will handle reading the
property both when CONFIG_OF_LIVE is enabled or disabled.

Due to the above problem and since commit 55103254c0ea ("efi_loader:
PSCI reset and shutdown") was added, the EFI system reset has been
broken for Tegra210 and Tegra196 platforms. This also fixes the EFI
system reset for these Tegra platforms.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Peter Robinson <pbrobinson@gmail.com>

diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index e0d66d74f54de842167ecd0d33d6ac11a86cdad0..23cf807591c47491544fd3793544882ef20359f2 100644 (file)
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -67,11 +67,9 @@ static int psci_bind(struct udevice *dev)
 
 static int psci_probe(struct udevice *dev)
 {
-       DECLARE_GLOBAL_DATA_PTR;
        const char *method;
 
-       method = fdt_stringlist_get(gd->fdt_blob, dev_of_offset(dev), "method",
-                                   0, NULL);
+       method = ofnode_read_string(dev_ofnode(dev), "method");
        if (!method) {
                pr_warn("missing \"method\" property\n");
                return -ENXIO;