soc/tegra: pmc: Update scratch as an optional aperture

Scratch address space register is used to store reboot reason. For
some Tegra234 systems, the scratch space is not available to store
the reboot reason. This is because scratch region on these systems
is not accessible by the kernel as restricted by the Hypervisor.
Such systems would delist scratch aperture from PMC DT node.

Hence this change makes scratch as optional aperture and also avoids
registering reboot notifier if scratch address space isn't mapped.

Signed-off-by: Petlozu Pravareshwar <petlozup@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 0bc983f6b0881c275ece4f44dd3c13df774cc27e..6948f78c7a4a9650432b837bc0a3a89bd8c577cc 100644 (file)
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -2903,11 +2903,16 @@ static int tegra_pmc_probe(struct platform_device *pdev)
                if (IS_ERR(pmc->aotag))
                        return PTR_ERR(pmc->aotag);
 
+               /* "scratch" is an optional aperture */
                res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
                                                "scratch");
-               pmc->scratch = devm_ioremap_resource(&pdev->dev, res);
-               if (IS_ERR(pmc->scratch))
-                       return PTR_ERR(pmc->scratch);
+               if (res) {
+                       pmc->scratch = devm_ioremap_resource(&pdev->dev, res);
+                       if (IS_ERR(pmc->scratch))
+                               return PTR_ERR(pmc->scratch);
+               } else {
+                       pmc->scratch = NULL;
+               }
        }
 
        pmc->clk = devm_clk_get_optional(&pdev->dev, "pclk");
@@ -2919,12 +2924,15 @@ static int tegra_pmc_probe(struct platform_device *pdev)
         * PMC should be last resort for restarting since it soft-resets
         * CPU without resetting everything else.
         */
-       err = devm_register_reboot_notifier(&pdev->dev,
-                                           &tegra_pmc_reboot_notifier);
-       if (err) {
-               dev_err(&pdev->dev, "unable to register reboot notifier, %d\n",
-                       err);
-               return err;
+       if (pmc->scratch) {
+               err = devm_register_reboot_notifier(&pdev->dev,
+                                                   &tegra_pmc_reboot_notifier);
+               if (err) {
+                       dev_err(&pdev->dev,
+                               "unable to register reboot notifier, %d\n",
+                               err);
+                       return err;
+               }
        }
 
        err = devm_register_sys_off_handler(&pdev->dev,