patch "iio: adc: nxp-sar-adc: Fix the delay calculation in" added to char-misc-linus

This is a note to let you know that I've just added the patch titled

iio: adc: nxp-sar-adc: Fix the delay calculation in

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From a9f41809bf1bd8e5c1bc4b6a1052adac58eb7ab6 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <[email protected]>
Date: Tue, 19 May 2026 23:56:06 +0200
Subject: iio: adc: nxp-sar-adc: Fix the delay calculation in
nxp_sar_adc_wait_for()

The original code was using ndelay() twice. In one case the delay is calculated as 1/3 of ADC clock and in the other as 80 ADC clocks. But according to the comments in all cases it should be a multiplier of the ADC clock, and not a fraction of it. Inadvertently nxp_sar_adc_wait_for() takes the wrong case and spread it over the code make it wrong in all places. Fix this by modifying a helper to correctly use the multiplier.

---
 drivers/iio/adc/nxp-sar-adc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 15c7432808f4..6bf896915788 100644
@@ -198,13 +198,13 @@ static void nxp_sar_adc_irq_cfg(struct nxp_sar_adc *info, bool enable)
 		writel(0, NXP_SAR_ADC_IMR(info->regs));
 }
 
-static void nxp_sar_adc_wait_for(struct nxp_sar_adc *info, unsigned int cycles)
+static void nxp_sar_adc_wait_for(struct nxp_sar_adc *info, u64 cycles)
 {
 	u64 rate;
 
 	rate = clk_get_rate(info->clk);
 	if (rate)
-		ndelay(div64_u64(NSEC_PER_SEC, rate * cycles));
+		ndelay(div64_u64(NSEC_PER_SEC * cycles, rate));
 }
 
 static bool nxp_sar_adc_set_enabled(struct nxp_sar_adc *info, bool enable)

2.55.0