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[98.183.112.25]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-27ba41057a9sm1471743fac.49.2024.09.09.07.51.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Sep 2024 07:51:36 -0700 (PDT) Message-ID: Date: Mon, 9 Sep 2024 09:51:35 -0500 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] iio: dac: support the ad8460 Waveform DAC To: "Tinaco, Mariel" , "linux-iio@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , "Hennerich, Michael" , Conor Dooley , Marcelo Schmitt , Dimitri Fedrau , =?UTF-8?Q?Nuno_S=C3=A1?= References: <20240904023040.23352-1-Mariel.Tinaco@analog.com> <20240904023040.23352-3-Mariel.Tinaco@analog.com> Content-Language: en-US From: David Lechner In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/9/24 4:47 AM, Tinaco, Mariel wrote: > > ... >>> + *val = get_unaligned_le16(state->spi_tx_buf); >> >> With spi_tx_buf changed to __le16, this can use le16_to_cpu() instead of >> get_unaligned_le16(). >> > > I suppose we use the cpu_to_le16 for the set_hvdac_word function? > > static int ad8460_set_hvdac_word(struct ad8460_state *state, int index, int val) > { > state->spi_tx_buf = cpu_to_le16(FIELD_PREP(AD8460_DATA_BYTE_FULL_MSK, val)); > > return regmap_bulk_write(state->regmap, AD8460_HVDAC_DATA_WORD(index), > &state->spi_tx_buf, AD8460_DATA_BYTE_WORD_LENGTH); > } > Yes, that looks correct. >>> +static ssize_t ad8460_write_toggle_en(struct iio_dev *indio_dev, uintptr_t >> private, >>> + const struct iio_chan_spec *chan, >>> + const char *buf, size_t len) { >>> + struct ad8460_state *state = iio_priv(indio_dev); >>> + bool toggle_en; >>> + int ret; >>> + >>> + ret = kstrtobool(buf, &toggle_en); >>> + if (ret) >>> + return ret; >>> + >>> + iio_device_claim_direct_scoped(return -EBUSY, indio_dev) >>> + return ad8460_enable_apg_mode(state, toggle_en); >>> + unreachable(); >>> +} >> >> Hmm... do we need to make an unscoped version of >> iio_device_claim_direct_scoped()? >> > > So iio_device_claim_direct_scoped is used here because the buffer enable/disable > accesses this enable_apg_mode function. Is it also a standard practice to put the > kstrobool() util inside the scope? > Since this is at the end of a function with nothing after it, it would be nice if we could avoid the indent and unreachable(); The idea would be to write the last 3 lines like this instead: guard_cond(iio_device_claim_direct, return -EBUSY, indio_dev); But I didn't see a `guard_cond()` analog of `guard()` in linux/cleanup.h. So this is probably fine for now and adding `guard_cond()` (if it is actually a good idea in the first place) can be a job for another time.