Received-SPF: pass (google.com: domain of linux-kernel+bounces-60879-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249;
Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates
 216.228.118.233 as permitted sender) receiver=protection.outlook.com;
 client-ip=216.228.118.233; helo=mail.nvidia.com; pr=C
From: Petlozu Pravareshwar <petlozup@nvidia.com>
To: <thierry.reding@gmail.com>, <jonathanh@nvidia.com>, <robh+dt@kernel.org>,
	<krzysztof.kozlowski+dt@linaro.org>, <conor+dt@kernel.org>,
	<p.zabel@pengutronix.de>, <dmitry.osipenko@collabora.com>,
	<ulf.hansson@linaro.org>, <kkartik@nvidia.com>, <cai.huoqing@linux.dev>,
	<spatra@nvidia.com>, <linux-tegra@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>
CC: <petlozup@nvidia.com>
Subject: [PATCH V3 3/3] soc/tegra: pmc: Update scratch as an optional aperture
Date: Sun, 11 Feb 2024 17:17:27 +0000
Message-ID: <20240211171727.914595-3-petlozup@nvidia.com>
In-Reply-To: <20240211171727.914595-1-petlozup@nvidia.com>
References: <20240211171727.914595-1-petlozup@nvidia.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Feb 2024 17:18:32.3474
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 371d86cc-3484-4a6e-9e42-08dc2b257913
X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com]
X-MS-Exchange-CrossTenant-AuthSource:
	CH2PEPF0000009F.namprd02.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8649

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>
---
 drivers/soc/tegra/pmc.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 0bc983f6b088..6948f78c7a4a 100644
--- 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,
-- 
2.34.1