linux-kernel - [PATCH v2 1/3] memory: tegra: Add helper function tegra_get_memory

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Date:   Tue, 29 Sep 2020 17:30:11 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     thierry.reding@...il.com, joro@...tes.org, krzk@...nel.org,
        digetx@...il.com
Cc:     vdumpa@...dia.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] memory: tegra: Add helper function tegra_get_memory_controller

This can be used by both tegra-smmu and tegra20-devfreq drivers.

Suggested-by: Dmitry Osipenko <digetx@...il.com>
Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
---

Changelog
v1->v2
 * N/A

 drivers/memory/tegra/mc.c | 23 +++++++++++++++++++++++
 include/soc/tegra/mc.h    |  1 +
 2 files changed, 24 insertions(+)

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index ec8403557ed4..09352ad66dcc 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -42,6 +42,29 @@ static const struct of_device_id tegra_mc_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, tegra_mc_of_match);
 
+struct tegra_mc *tegra_get_memory_controller(void)
+{
+	struct platform_device *pdev;
+	struct device_node *np;
+	struct tegra_mc *mc;
+
+	np = of_find_matching_node_and_match(NULL, tegra_mc_of_match, NULL);
+	if (!np)
+		return ERR_PTR(-ENOENT);
+
+	pdev = of_find_device_by_node(np);
+	of_node_put(np);
+	if (!pdev)
+		return ERR_PTR(-ENODEV);
+
+	mc = platform_get_drvdata(pdev);
+	if (!mc)
+		return ERR_PTR(-EPROBE_DEFER);
+
+	return mc;
+}
+EXPORT_SYMBOL_GPL(tegra_get_memory_controller);
+
 static int tegra_mc_block_dma_common(struct tegra_mc *mc,
 				     const struct tegra_mc_reset *rst)
 {
diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
index 1238e35653d1..c72718fd589f 100644
--- a/include/soc/tegra/mc.h
+++ b/include/soc/tegra/mc.h
@@ -183,5 +183,6 @@ struct tegra_mc {
 
 int tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate);
 unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc);
+struct tegra_mc *tegra_get_memory_controller(void);
 
 #endif /* __SOC_TEGRA_MC_H__ */
-- 
2.17.1