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[98.183.112.25]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-602843bc042sm389572eaf.0.2025.03.28.09.40.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 28 Mar 2025 09:40:11 -0700 (PDT) Message-ID: <68db2225-4519-4436-bee2-24fbe320ac4f@baylibre.com> Date: Fri, 28 Mar 2025 11:40:10 -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 4/4] iio: dac: ad3552r-hs: add support for internal ramp To: =?UTF-8?Q?Nuno_S=C3=A1?= , Angelo Dureghello , =?UTF-8?Q?Nuno_S=C3=A1?= , Jonathan Cameron , Lars-Peter Clausen , Jonathan Corbet , Olivier Moysan , Michael Hennerich Cc: linux-iio@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250321-wip-bl-ad3552r-fixes-v1-0-3c1aa249d163@baylibre.com> <20250321-wip-bl-ad3552r-fixes-v1-4-3c1aa249d163@baylibre.com> <2d12ff156996876e5bd85c793c07bb0c6747981c.camel@gmail.com> Content-Language: en-US From: David Lechner In-Reply-To: <2d12ff156996876e5bd85c793c07bb0c6747981c.camel@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 3/28/25 3:28 AM, Nuno Sá wrote: > On Fri, 2025-03-21 at 21:28 +0100, Angelo Dureghello wrote: >> From: Angelo Dureghello >> >> The ad3552r can be feeded from the HDL controller by an internally >> generated 16bit ramp, useful for debug pourposes. Add debugfs a file >> to enable or disable it. >> >> Signed-off-by: Angelo Dureghello >> --- ... >> +static ssize_t ad3552r_hs_write_data_source(struct file *f, >> +     const char __user *userbuf, >> +     size_t count, loff_t *ppos) >> +{ >> + struct ad3552r_hs_state *st = file_inode(f)->i_private; >> + char buf[64]; >> + int ret; >> + >> + ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf, >> +      count); >> + if (ret < 0) >> + return ret; >> + >> + buf[count] = 0; >> + >> + if (count == 10 && !strncmp(buf, "iio-buffer", 10)) { >> + ret = ad3552r_hs_set_data_source(st, IIO_BACKEND_EXTERNAL); >> + if (ret) >> + return ret; >> + } else if (count == 22 && !strncmp(buf, "backend-ramp-generator", 22)) { >> + ret = ad3552r_hs_set_data_source(st, >> + IIO_BACKEND_INTERNAL_RAMP_16BIT); >> + if (ret) >> + return ret; >> + } else { >> + return -EINVAL; >> + } > > Are we expected to add more data types in the future? If not, this could be simply an > enable/disable ramp generator thing... It would be much simpler. Angelo actually had implemented it that way originally. :-) I suggested to change it to a string because the HDL project for this family of DACs actually has 3 possibilities for the data source: * Selectable input source: DMA/ADC/TEST_RAMP; And there are other potential sources from the generic AXI DAC like 0x00: internal tone (DDS) that seems somewhat likely to be seen in the future. > > Anyways, you could define a static array and use match_string()? > > Lastly, for insterfaces like this, it's always helpful to have an _available kind of > attribute. > > - Nuno Sá > > > >>   >>  static const struct of_device_id ad3552r_hs_of_id[] = { >> > >