linux-kernel - [PATCH v3 13/19] nvmem: microchip-otpc: Enable necessary clocks

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Message-ID: <20260120154502.1280938-7-ada@thorsis.com>
Date: Tue, 20 Jan 2026 16:44:47 +0100
From: Alexander Dahl <ada@...rsis.com>
To: Claudiu Beznea <claudiu.beznea@...on.dev>
Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Ryan Wanner <ryan.wanner@...rochip.com>,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-clk@...r.kernel.org,
	Srinivas Kandagatla <srini@...nel.org>
Subject: [PATCH v3 13/19] nvmem: microchip-otpc: Enable necessary clocks

Without enabling the main rc clock, initializing the packet list leads
to a read timeout on the first packet, at least on sam9x60.

According to SAM9X60 datasheet (DS60001579G) section "23.4 Product
Dependencies" the clock must be enabled for reading and writing.

Tested on sam9x60-curiosity board.

Link: https://lore.kernel.org/linux-clk/ec34efc2-2051-4b8a-b5d8-6e2fd5e08c28@microchip.com/T/#u
Signed-off-by: Alexander Dahl <ada@...rsis.com>
---

Notes:
    v3:
    - Rewrap lines
    
    v2:
    - Rewrite to enable _all_ clocks defined in dts

 drivers/nvmem/microchip-otpc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvmem/microchip-otpc.c b/drivers/nvmem/microchip-otpc.c
index d39f2d57e5f5e..34c0d7611f3e4 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/iopoll.h>
 #include <linux/module.h>
 #include <linux/nvmem-provider.h>
@@ -241,6 +242,7 @@ static struct nvmem_config mchp_nvmem_config = {
 static int mchp_otpc_probe(struct platform_device *pdev)
 {
 	struct nvmem_device *nvmem;
+	struct clk_bulk_data *clks;
 	struct mchp_otpc *otpc;
 	u32 size;
 	int ret;
@@ -253,6 +255,10 @@ static int mchp_otpc_probe(struct platform_device *pdev)
 	if (IS_ERR(otpc->base))
 		return PTR_ERR(otpc->base);
 
+	ret = devm_clk_bulk_get_all_enabled(&pdev->dev, &clks);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret, "Error getting clocks!\n");
+
 	otpc->dev = &pdev->dev;
 	ret = mchp_otpc_init_packets_list(otpc, &size);
 	if (ret)
-- 
2.47.3