linux-kernel - [PATCH v4 4/5] memory: tegra186: Register as memory controller

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Message-Id: <20200213163959.819733-5-thierry.reding@gmail.com>
Date:   Thu, 13 Feb 2020 17:39:58 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Arnd Bergmann <arnd@...db.de>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Joerg Roedel <joro@...tes.org>, Olof Johansson <olof@...om.net>,
        linux-tegra@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 4/5] memory: tegra186: Register as memory controller

From: Thierry Reding <treding@...dia.com>

Registering as memory controller allows other drivers to obtain a
reference to it. This is mostly useful as a way of ordering probe
between devices depending on one another.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/memory/tegra/tegra186.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
index 5d53f11ca7b6..8c43702340e8 100644
--- a/drivers/memory/tegra/tegra186.c
+++ b/drivers/memory/tegra/tegra186.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/io.h>
+#include <linux/memory-controller.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/of_device.h>
@@ -32,6 +33,7 @@ struct tegra186_mc_soc {
 };
 
 struct tegra186_mc {
+	struct memory_controller base;
 	struct device *dev;
 	void __iomem *regs;
 
@@ -1532,13 +1534,18 @@ static int tegra186_mc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	mc->soc = of_device_get_match_data(&pdev->dev);
+	mc->dev = &pdev->dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	mc->regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(mc->regs))
 		return PTR_ERR(mc->regs);
 
-	mc->dev = &pdev->dev;
+	mc->base.dev = &pdev->dev;
+
+	err = memory_controller_register(&mc->base);
+	if (err < 0)
+		return err;
 
 	err = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
 	if (err < 0)
-- 
2.24.1