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([2600:8803:e7e4:500:cccf:5174:fa72:c520]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7d728d2eef0sm3316571a34.24.2026.03.07.09.43.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 07 Mar 2026 09:43:33 -0800 (PST) Message-ID: <27ffa24d-a388-46eb-8df7-04624cd32ea1@baylibre.com> Date: Sat, 7 Mar 2026 11:43:32 -0600 Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 5/6] iio: adc: ti-ads7950: switch to using devm_regulator_get_enable_read_voltage() To: Jonathan Cameron , Dmitry Torokhov Cc: =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , Linus Walleij , Bartosz Golaszewski , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, Jonathan Cameron References: <20260305-ti-ads7950-facelift-v3-0-a23fdd1a079e@gmail.com> <20260305-ti-ads7950-facelift-v3-5-a23fdd1a079e@gmail.com> <20260307114947.0b946dfb@jic23-huawei> Content-Language: en-US From: David Lechner In-Reply-To: <20260307114947.0b946dfb@jic23-huawei> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/7/26 5:49 AM, Jonathan Cameron wrote: > On Thu, 05 Mar 2026 11:21:56 -0800 > Dmitry Torokhov wrote: > >> The regulator is enabled for the entire time the driver is bound to the >> device, and we only need to access it to fetch voltage, which can be >> done at probe time. >> >> Switch to using devm_regulator_get_enable_read_voltage() which >> simplifies probing and unbinding code. >> >> Suggested-by: David Lechner >> Signed-off-by: Dmitry Torokhov > Hi. > > I think this broke the ACPI case (where regulator isn't available). > > Jonathan > >> --- >> drivers/iio/adc/ti-ads7950.c | 45 +++++++++++--------------------------------- >> 1 file changed, 11 insertions(+), 34 deletions(-) >> >> diff --git a/drivers/iio/adc/ti-ads7950.c b/drivers/iio/adc/ti-ads7950.c >> index 273c35e03185..847e83baa876 100644 >> --- a/drivers/iio/adc/ti-ads7950.c >> +++ b/drivers/iio/adc/ti-ads7950.c >> @@ -341,19 +341,9 @@ static int ti_ads7950_scan_direct(struct iio_dev *indio_dev, unsigned int ch) >> return st->single_rx; >> } >> >> -static int ti_ads7950_get_range(struct ti_ads7950_state *st) >> +static unsigned int ti_ads7950_get_range(struct ti_ads7950_state *st) >> { >> - int vref; >> - >> - if (st->vref_mv) { >> - vref = st->vref_mv; >> - } else { >> - vref = regulator_get_voltage(st->reg); >> - if (vref < 0) >> - return vref; >> - >> - vref /= 1000; >> - } >> + unsigned int vref = st->vref_mv; >> >> if (st->cmd_settings_bitmask & TI_ADS7950_CR_RANGE_5V) >> vref *= 2; >> @@ -382,11 +372,7 @@ static int ti_ads7950_read_raw(struct iio_dev *indio_dev, >> >> return IIO_VAL_INT; >> case IIO_CHAN_INFO_SCALE: >> - ret = ti_ads7950_get_range(st); >> - if (ret < 0) >> - return ret; >> - >> - *val = ret; >> + *val = ti_ads7950_get_range(st); >> *val2 = (1 << chan->scan_type.realbits) - 1; >> >> return IIO_VAL_FRACTIONAL; >> @@ -580,30 +566,24 @@ static int ti_ads7950_probe(struct spi_device *spi) >> spi_message_init_with_transfers(&st->scan_single_msg, >> st->scan_single_xfer, 3); >> >> + ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref"); >> + if (ret < 0) > > I think you need to check for -ENODEV and if you see than then > see if the acpi route below applies. Otherwise on ACPI this will fail > and we'll fail the probe. > Or do something like: if (ACPI_COMPANION(&spi->dev)) { ret = devm_regulator_get_enable(&spi->dev, "vref"); if (ret) return dev_err_probe(&spi->dev, ret, "Failed to get regulator \"vref\"\n"); st->vref_mv = TI_ADS7950_VA_MV_ACPI_DEFAULT; } else { ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref"); if (ret < 0) return dev_err_probe(&spi->dev, ret, "Failed to get regulator \"vref\"\n"); st->vref_mv = ret / 1000; } > >> + return dev_err_probe(&spi->dev, ret, >> + "Failed to get regulator \"vref\"\n"); >> + >> /* Use hard coded value for reference voltage in ACPI case */ >> if (ACPI_COMPANION(&spi->dev)) >> st->vref_mv = TI_ADS7950_VA_MV_ACPI_DEFAULT; >> + else >> + st->vref_mv = ret / 1000; > >