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([2600:8803:e7e4:1d00:f7b4:dfbd:5110:c59d]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-3196d46d8a6sm345913fac.18.2025.08.30.09.41.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 30 Aug 2025 09:41:26 -0700 (PDT) Message-ID: Date: Sat, 30 Aug 2025 11:41:25 -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 06/15] spi: spi-offload-trigger-pwm: Use duty offset To: Marcelo Schmitt , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, devicetree@vger.kernel.org, linux-spi@vger.kernel.org, =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= Cc: Axel Haslam , jic23@kernel.org, Michael.Hennerich@analog.com, nuno.sa@analog.com, eblanc@baylibre.com, andy@kernel.org, corbet@lwn.net, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, broonie@kernel.org, Jonathan.Cameron@huawei.com, andriy.shevchenko@linux.intel.com, marcelo.schmitt1@gmail.com References: <2410525339f56466fa566dda367678ec92f9fb98.1756511030.git.marcelo.schmitt@analog.com> Content-Language: en-US From: David Lechner In-Reply-To: <2410525339f56466fa566dda367678ec92f9fb98.1756511030.git.marcelo.schmitt@analog.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/29/25 7:42 PM, Marcelo Schmitt wrote: > From: Axel Haslam > > Pass the duty offset to the waveform pwm. > > Signed-off-by: Axel Haslam > Signed-off-by: Marcelo Schmitt > --- > drivers/spi/spi-offload-trigger-pwm.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/spi/spi-offload-trigger-pwm.c b/drivers/spi/spi-offload-trigger-pwm.c > index 805ed41560df..8413aeb3689d 100644 > --- a/drivers/spi/spi-offload-trigger-pwm.c > +++ b/drivers/spi/spi-offload-trigger-pwm.c > @@ -51,13 +51,13 @@ static int spi_offload_trigger_pwm_validate(struct spi_offload_trigger *trigger, > wf.period_length_ns = DIV_ROUND_UP_ULL(NSEC_PER_SEC, periodic->frequency_hz); > /* REVISIT: 50% duty-cycle for now - may add config parameter later */ > wf.duty_length_ns = wf.period_length_ns / 2; > - > + wf.duty_offset_ns = periodic->offset_ns; I would be tempted to put the loop check here: offload_offset_ns = periodic->offset_ns; do { wf.offset_ns = offload_offset_ns; ret = pwm_round_waveform_might_sleep(st->pwm, &wf); if (ret) return ret; offload_offset_ns += 10; } while (wf.offset_ns < periodic->offset_ns); wf.duty_offset_ns = periodic->offset_ns; instead of in the ADC driver so that all future callers don't have to repeat this. Also cc: Uwe in case he has any better suggestions on how to avoid repeating such verbose validations by all uses of the PWM waveform APIs. > ret = pwm_round_waveform_might_sleep(st->pwm, &wf); > if (ret < 0) > return ret; > > periodic->frequency_hz = DIV_ROUND_UP_ULL(NSEC_PER_SEC, wf.period_length_ns); > - > + periodic->offset_ns = wf.duty_offset_ns; > return 0; > } > > @@ -77,6 +77,7 @@ static int spi_offload_trigger_pwm_enable(struct spi_offload_trigger *trigger, > wf.period_length_ns = DIV_ROUND_UP_ULL(NSEC_PER_SEC, periodic->frequency_hz); > /* REVISIT: 50% duty-cycle for now - may add config parameter later */ > wf.duty_length_ns = wf.period_length_ns / 2; > + wf.duty_offset_ns = periodic->offset_ns; > > return pwm_set_waveform_might_sleep(st->pwm, &wf, false); > }