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([2600:8803:e7e4:500:b75d:2440:dc10:808b]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7dc269402b9sm2527358a34.20.2026.04.10.13.46.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Apr 2026 13:46:38 -0700 (PDT) Message-ID: <0f05add7-96c0-4eee-b396-d6e1be904c09@baylibre.com> Date: Fri, 10 Apr 2026 15:46:36 -0500 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 3/6] iio: adc: ad4691: add triggered buffer support To: radu.sabau@analog.com, Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= , Liam Girdwood , Mark Brown , Linus Walleij , Bartosz Golaszewski , Philipp Zabel , Jonathan Corbet , Shuah Khan Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, linux-gpio@vger.kernel.org, linux-doc@vger.kernel.org References: <20260409-ad4692-multichannel-sar-adc-driver-v7-0-be375d4df2c5@analog.com> <20260409-ad4692-multichannel-sar-adc-driver-v7-3-be375d4df2c5@analog.com> Content-Language: en-US From: David Lechner In-Reply-To: <20260409-ad4692-multichannel-sar-adc-driver-v7-3-be375d4df2c5@analog.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 4/9/26 10:28 AM, Radu Sabau via B4 Relay wrote: > From: Radu Sabau > > Add buffered capture support using the IIO triggered buffer framework. > ... > @@ -201,8 +245,45 @@ struct ad4691_state { > * atomicity of consecutive SPI operations. > */ > struct mutex lock; > + /* > + * Per-buffer-enable lifetime resources: > + * Manual Mode - a pre-built SPI message that clocks out N+1 > + * transfers in one go. > + * CNV Burst Mode - a pre-built SPI message that clocks out 2*N > + * transfers in one go. > + */ > + struct spi_message scan_msg; > + /* max 16 + 1 NOOP (manual) or 2*16 + 2 (CNV burst). */ > + struct spi_transfer scan_xfers[34]; > + /* > + * CNV burst: 16 AVG_IN addresses + state-reset address + state-reset > + * value = 18. Manual: 16 channel cmds + 1 NOOP = 17. > + */ > + __be16 scan_tx[18]; Needs __aligned(IIO_DMA_MINALIGN) since it is used with SPI. > + /* Scan buffer: one BE16 slot per channel (rx'd directly), plus timestamp */ > + struct { > + __be16 vals[16]; > + aligned_s64 ts; > + } scan; Unless it is required that all channels are always enabled: IIO_DECLARE_BUFFER_WITH_TS(__be16, scan_rx, 16); In any case, needs to be DMA-safe for SPI. > }; > > +static int ad4691_cnv_burst_buffer_preenable(struct iio_dev *indio_dev) > +{ > + struct ad4691_state *st = iio_priv(indio_dev); > + unsigned int n_active; > + unsigned int k, i; > + int ret; > + > + n_active = bitmap_weight(indio_dev->active_scan_mask, iio_get_masklength(indio_dev)); > + > + memset(st->scan_xfers, 0, (2 * n_active + 2) * sizeof(st->scan_xfers[0])); > + memset(st->scan_tx, 0, (n_active + 2) * sizeof(st->scan_tx[0])); Maybe simpler to just clear the whole thing? (same with other preenable) > + > + spi_message_init(&st->scan_msg); > +