From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: Prabhakar <prabhakar.csengg@gmail.com>
Cc: "Cosmin Tanislav" <cosmin-gabriel.tanislav.xa@renesas.com>,
"Jonathan Cameron" <jic23@kernel.org>,
"David Lechner" <dlechner@baylibre.com>,
"Nuno Sá" <nuno.sa@analog.com>,
"Andy Shevchenko" <andy@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Philipp Zabel" <p.zabel@pengutronix.de>,
"Geert Uytterhoeven" <geert+renesas@glider.be>,
"Magnus Damm" <magnus.damm@gmail.com>,
linux-iio@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Prabhakar <prabhakar.csengg+renesas@gmail.com>,
"Biju Das" <biju.das.jz@bp.renesas.com>,
"Fabrizio Castro" <fabrizio.castro.jz@renesas.com>,
"Lad Prabhakar" <prabhakar.mahadev-lad.rj@bp.renesas.com>
Subject: Re: [PATCH v2 2/8] iio: adc: rzt2h: Wait for the analog part to stop after a forced stop
Date: Tue, 13 Oct 2026 17:55:24 +0300 [thread overview]
Message-ID: <as5GXPcMKe-CBLXK@ashevche-desk.local> (raw)
In-Reply-To: <20261009184122.1378797-3-prabhakar.mahadev-lad.rj@bp.renesas.com>
On Fri, Oct 09, 2026 at 07:41:16PM +0100, Prabhakar wrote:
> When ADCSR.ADST is cleared to forcibly stop a conversion, the analog part
> of the A/D converter can take up to 2 ADCLK cycles to stop operating.
>
> Wait for the write to ADCSR to complete and allow the analog part to stop
> before reconfiguring or restarting the converter.
...
> + /*
> + * When a conversion is forcibly stopped, the analog part of the A/D
> + * converter takes up to 2 ADCLK cycles to stop operating. Read back
> + * ADCSR to make sure the write has reached the hardware before
> + * starting the delay.
> + */
> + readw(adc->base + RZT2H_ADCSR_REG);
> + ndelay(DIV_ROUND_UP(RZT2H_ADC_STOP_CYCLES * NSEC_PER_SEC,
> + adc->adclk_rate));
A single line (84 characters) is okay in this case.
ndelay(DIV_ROUND_UP(RZT2H_ADC_STOP_CYCLES * NSEC_PER_SEC, adc->adclk_rate));
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2026-10-13 14:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-09 18:41 [PATCH v2 0/8] Add ADC driver support for RZ/V2H(P) and RZ/V2N SoCs Prabhakar
2026-10-09 18:41 ` [PATCH v2 1/8] dt-bindings: iio: adc: renesas,r9a09g077-adc: Add RZ/V2H(P) and RZ/V2N support Prabhakar
2026-10-12 21:07 ` Conor Dooley
2026-10-09 18:41 ` [PATCH v2 2/8] iio: adc: rzt2h: Wait for the analog part to stop after a forced stop Prabhakar
2026-10-13 14:55 ` Andy Shevchenko [this message]
2026-10-09 18:41 ` [PATCH v2 3/8] iio: adc: rzt2h: Add chip-specific configuration Prabhakar
2026-10-09 18:41 ` [PATCH v2 4/8] iio: adc: rzt2h: Add optional reset support Prabhakar
2026-10-09 18:53 ` sashiko-bot
2026-10-09 18:41 ` [PATCH v2 5/8] iio: adc: rzt2h: Prepare for SoCs without sample state registers Prabhakar
2026-10-09 18:41 ` [PATCH v2 6/8] iio: adc: rzt2h: Prepare for SoCs with different ADC info Prabhakar
2026-10-09 18:41 ` [PATCH v2 7/8] iio: adc: rzt2h: Use scan type for ADC scale Prabhakar
2026-10-09 18:41 ` [PATCH v2 8/8] iio: adc: rzt2h: Add support for RZ/V2H(P) SoC Prabhakar
2026-10-09 19:02 ` sashiko-bot
2026-10-13 13:34 ` Lad, Prabhakar
2026-10-12 6:36 ` Biju Das
2026-10-13 11:53 ` Lad, Prabhakar
2026-10-13 15:16 ` Andy Shevchenko
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