linux-kernel - Re: [PATCH v2 2/5] spi: spi-nxp-fspi: set back to dll override mode when clock rate

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Message-ID: <aMrhO+//We97QeLL@lizhi-Precision-Tower-5810>
Date: Wed, 17 Sep 2025 12:26:35 -0400
From: Frank Li <Frank.li@....com>
To: Haibo Chen <haibo.chen@....com>
Cc: Han Xu <han.xu@....com>, Yogesh Gaur <yogeshgaur.83@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
	imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] spi: spi-nxp-fspi: set back to dll override mode
 when clock rate < 100MHz

On Wed, Sep 17, 2025 at 03:27:07PM +0800, Haibo Chen wrote:
> Preparation of supportting DTR mode. In nor suspend, driver will disable
> DTR mode, and enable DTR mode back in nor resume. This require the flexspi
> driver has the ability to set back to dll override mode in STR mode when
> clock rate < 100MHz.
>
> Signed-off-by: Haibo Chen <haibo.chen@....com>
> ---
Reviewed-by: Frank Li <Frank.Li@....com>

>  drivers/spi/spi-nxp-fspi.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
> index db4b92490de957580c6298baeb8b68a310c23615..a1c9ad03379682dc1fc2908fbd83e1ae8e91588f 100644
> --- a/drivers/spi/spi-nxp-fspi.c
> +++ b/drivers/spi/spi-nxp-fspi.c
> @@ -767,6 +767,8 @@ static void nxp_fspi_select_mem(struct nxp_fspi *f, struct spi_device *spi,
>  	 */
>  	if (rate > 100000000)
>  		nxp_fspi_dll_calibration(f);
> +	else
> +		nxp_fspi_dll_override(f);
>
>  	f->selected = spi_get_chipselect(spi, 0);
>  }
>
> --
> 2.34.1
>