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Message-Id: <20240821105943.230281-12-ada@thorsis.com>
Date: Wed, 21 Aug 2024 12:59:42 +0200
From: Alexander Dahl <ada@...rsis.com>
To: Claudiu Beznea <claudiu.beznea@...on.dev>
Cc: Christian Melki <christian.melki@...ata.com>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
linux-arm-kernel@...ts.infradead.org (moderated list:MICROCHIP OTPC DRIVER),
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v1 11/12] nvmem: microchip-otpc: Enable main RC oscillator clock
Without enabling that clock, initializing the packet list leads to a
read timeout on the first packet.
According to SAM9X60 datasheet (DS60001579G) section "23.4 Product
Dependencies" the clock must be enabled for reading and writing.
Tested on sam9x60-curiosity board.
Signed-off-by: Alexander Dahl <ada@...rsis.com>
---
drivers/nvmem/microchip-otpc.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/nvmem/microchip-otpc.c b/drivers/nvmem/microchip-otpc.c
index a80535c3d162..047ca5ac6407 100644
--- a/drivers/nvmem/microchip-otpc.c
+++ b/drivers/nvmem/microchip-otpc.c
@@ -8,6 +8,7 @@
*/
#include <linux/bitfield.h>
+#include <linux/clk.h>
#include <linux/dev_printk.h>
#include <linux/iopoll.h>
#include <linux/module.h>
@@ -54,6 +55,7 @@
struct mchp_otpc {
void __iomem *base;
struct device *dev;
+ struct clk *clk;
struct list_head packets;
u32 npackets;
};
@@ -272,6 +274,15 @@ static int mchp_otpc_probe(struct platform_device *pdev)
if (IS_ERR(otpc->base))
return PTR_ERR(otpc->base);
+ // NOTE: Maybe make this optional, especially if sama7g5 testing
+ // shows the clock is not required there?
+ otpc->clk = devm_clk_get_enabled(&pdev->dev, "main_rc_osc");
+ if (IS_ERR(otpc->clk)) {
+ dev_err(&pdev->dev, "Error (%ld) getting clock!\n",
+ PTR_ERR(otpc->clk));
+ return PTR_ERR(otpc->clk);
+ }
+
reg = readl_relaxed(otpc->base + MCHP_OTPC_WPSR);
if (reg)
dev_warn(&pdev->dev,
--
2.39.2
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