linux-kernel - [PATCH v3 3/6] soc/tegra: fuse: Add function to add lookups

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Date:   Thu, 7 Sep 2023 12:40:49 +0530
From:   Kartik <kkartik@...dia.com>
To:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <sumitg@...dia.com>, <arnd@...db.de>, <pshete@...dia.com>,
        <andriy.shevchenko@...ux.intel.com>, <kkartik@...dia.com>,
        <digetx@...il.com>, <petlozup@...dia.com>, <windhl@....com>,
        <frank.li@...o.com>, <robh@...nel.org>, <stefank@...dia.com>,
        <pdeschrijver@...dia.com>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 3/6] soc/tegra: fuse: Add function to add lookups

Add helper function tegra_fuse_add_lookups() to register Tegra fuse
nvmem lookups. So, this can be shared between tegra_fuse_init() and
ACPI probe, which is to be introduced later.

Signed-off-by: Kartik <kkartik@...dia.com>
---
v1 -> v2:
	* Use size_mul to calculate lookups array size.
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index a2c28f493a75..821bb485ec45 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -113,6 +113,24 @@ static void tegra_fuse_restore(void *base)
 	fuse->clk = NULL;
 }
 
+static int tegra_fuse_add_lookups(struct tegra_fuse *fuse)
+{
+	size_t size;
+
+	if (!fuse->soc->lookups)
+		return 0;
+
+	size = size_mul(sizeof(*fuse->lookups), fuse->soc->num_lookups);
+
+	fuse->lookups = kmemdup(fuse->soc->lookups, size, GFP_KERNEL);
+	if (!fuse->lookups)
+		return -ENOMEM;
+
+	nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
+
+	return 0;
+}
+
 static int tegra_fuse_probe(struct platform_device *pdev)
 {
 	void __iomem *base = fuse->base;
@@ -407,6 +425,7 @@ static int __init tegra_init_fuse(void)
 	const struct of_device_id *match;
 	struct device_node *np;
 	struct resource regs;
+	int err;
 
 	tegra_init_apbmisc();
 
@@ -504,12 +523,10 @@ static int __init tegra_init_fuse(void)
 	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
 		 tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id);
 
-	if (fuse->soc->lookups) {
-		size_t size = sizeof(*fuse->lookups) * fuse->soc->num_lookups;
-
-		fuse->lookups = kmemdup(fuse->soc->lookups, size, GFP_KERNEL);
-		if (fuse->lookups)
-			nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
+	err = tegra_fuse_add_lookups(fuse);
+	if (err) {
+		pr_err("failed to add FUSE lookups\n");
+		return err;
 	}
 
 	return 0;
-- 
2.34.1