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

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Message-ID: <e0047afc-2109-4062-bc51-045ccd7f868a@tuxon.dev>
Date: Sat, 31 Jan 2026 18:03:28 +0200
From: Claudiu Beznea <claudiu.beznea@...on.dev>
To: Alexander Dahl <ada@...rsis.com>
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: Re: [PATCH v3 13/19] nvmem: microchip-otpc: Enable necessary clocks



On 1/20/26 17:44, Alexander Dahl wrote:
> 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

Why this link here?

> Signed-off-by: Alexander Dahl <ada@...rsis.com>

Reviewed-by: Claudiu Beznea <claudiu.beznea@...on.dev>

> ---
> 
> 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)