linux-kernel - [Patch v3 01/11] firmware: tegra: add function to get BPMP data

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Message-ID: <20230320182441.11904-2-sumitg@nvidia.com>
Date:   Mon, 20 Mar 2023 23:54:31 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     <treding@...dia.com>, <krzysztof.kozlowski@...aro.org>,
        <dmitry.osipenko@...labora.com>, <viresh.kumar@...aro.org>,
        <rafael@...nel.org>, <jonathanh@...dia.com>, <robh+dt@...nel.org>,
        <lpieralisi@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <mmaddireddy@...dia.com>,
        <kw@...ux.com>, <bhelgaas@...gle.com>, <vidyas@...dia.com>,
        <sanjayc@...dia.com>, <ksitaraman@...dia.com>, <ishah@...dia.com>,
        <bbasu@...dia.com>, <sumitg@...dia.com>
Subject: [Patch v3 01/11] firmware: tegra: add function to get BPMP data

Add new function 'of_tegra_bpmp_get()' which can be
used by other drivers like MC to get BPMP data without
adding any property in respective drivers DT node.

Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 drivers/firmware/tegra/bpmp.c | 38 +++++++++++++++++++++++++++++++++++
 include/soc/tegra/bpmp.h      |  5 +++++
 2 files changed, 43 insertions(+)

diff --git a/drivers/firmware/tegra/bpmp.c b/drivers/firmware/tegra/bpmp.c
index 042c2043929d..d825067a223a 100644
--- a/drivers/firmware/tegra/bpmp.c
+++ b/drivers/firmware/tegra/bpmp.c
@@ -39,6 +39,44 @@ channel_to_ops(struct tegra_bpmp_channel *channel)
 	return bpmp->soc->ops;
 }
 
+struct tegra_bpmp *of_tegra_bpmp_get(void)
+{
+	struct platform_device *pdev;
+	struct device_node *bpmp_dev;
+	struct tegra_bpmp *bpmp;
+
+	/* Check for bpmp device status in DT */
+	bpmp_dev = of_find_compatible_node(NULL, NULL, "nvidia,tegra186-bpmp");
+	if (!bpmp_dev) {
+		bpmp = ERR_PTR(-ENODEV);
+		goto err_out;
+	}
+	if (!of_device_is_available(bpmp_dev)) {
+		bpmp = ERR_PTR(-ENODEV);
+		goto err_put;
+	}
+
+	pdev = of_find_device_by_node(bpmp_dev);
+	if (!pdev) {
+		bpmp = ERR_PTR(-ENODEV);
+		goto err_put;
+	}
+
+	bpmp = platform_get_drvdata(pdev);
+	if (!bpmp) {
+		bpmp = ERR_PTR(-EPROBE_DEFER);
+		put_device(&pdev->dev);
+		goto err_put;
+	}
+
+	return bpmp;
+err_put:
+	of_node_put(bpmp_dev);
+err_out:
+	return bpmp;
+}
+EXPORT_SYMBOL_GPL(of_tegra_bpmp_get);
+
 struct tegra_bpmp *tegra_bpmp_get(struct device *dev)
 {
 	struct platform_device *pdev;
diff --git a/include/soc/tegra/bpmp.h b/include/soc/tegra/bpmp.h
index 5842e38bb288..9fd3aa9e69bb 100644
--- a/include/soc/tegra/bpmp.h
+++ b/include/soc/tegra/bpmp.h
@@ -120,6 +120,7 @@ struct tegra_bpmp_message {
 };
 
 #if IS_ENABLED(CONFIG_TEGRA_BPMP)
+struct tegra_bpmp *of_tegra_bpmp_get(void);
 struct tegra_bpmp *tegra_bpmp_get(struct device *dev);
 void tegra_bpmp_put(struct tegra_bpmp *bpmp);
 int tegra_bpmp_transfer_atomic(struct tegra_bpmp *bpmp,
@@ -135,6 +136,10 @@ void tegra_bpmp_free_mrq(struct tegra_bpmp *bpmp, unsigned int mrq,
 			 void *data);
 bool tegra_bpmp_mrq_is_supported(struct tegra_bpmp *bpmp, unsigned int mrq);
 #else
+static inline struct tegra_bpmp *of_tegra_bpmp_get(void)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
 static inline struct tegra_bpmp *tegra_bpmp_get(struct device *dev)
 {
 	return ERR_PTR(-ENOTSUPP);
-- 
2.17.1