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[78.94.0.50]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43d3bb2b2ffsm156670915e9.1.2025.03.24.11.58.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Mar 2025 11:58:06 -0700 (PDT) From: Your Name X-Google-Original-From: Your Name To: Jean Delvare , Guenter Roeck , linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Naresh Solanki Subject: [PATCH] hwmon: (max6639) : Allow setting target RPM Date: Tue, 25 Mar 2025 00:27:44 +0530 Message-ID: <20250324185744.2421462-1-you@example.com> X-Mailer: git-send-email 2.42.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Naresh Solanki Currently, during startup, the fan is set to its maximum RPM by default, which may not be suitable for all use cases. This patch introduces support for specifying a target RPM via the Device Tree property "target-rpm". Changes: - Added `target_rpm` field to `max6639_data` structure to store the target RPM for each fan channel. - Modified `max6639_probe_child_from_dt()` to read the `"target-rpm"` property from the Device Tree and set `target_rpm` accordingly. - Updated `max6639_init_client()` to use `target_rpm` to compute the initial PWM duty cycle instead of defaulting to full speed (120/120). Behavior: - If `"target-rpm"` is specified, the fan speed is set accordingly. - If `"target-rpm"` is not specified, the previous behavior (full speed at startup) is retained. This allows better control over fan speed during system initialization. Signed-off-by: Naresh Solanki --- drivers/hwmon/max6639.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c index 32b4d54b2076..ca8a8f58d133 100644 --- a/drivers/hwmon/max6639.c +++ b/drivers/hwmon/max6639.c @@ -80,6 +80,7 @@ struct max6639_data { /* Register values initialized only once */ u8 ppr[MAX6639_NUM_CHANNELS]; /* Pulses per rotation 0..3 for 1..4 ppr */ u8 rpm_range[MAX6639_NUM_CHANNELS]; /* Index in above rpm_ranges table */ + u32 target_rpm[MAX6639_NUM_CHANNELS]; =20 /* Optional regulator for FAN supply */ struct regulator *reg; @@ -560,8 +561,14 @@ static int max6639_probe_child_from_dt(struct i2c_clie= nt *client, } =20 err =3D of_property_read_u32(child, "max-rpm", &val); - if (!err) + if (!err) { data->rpm_range[i] =3D rpm_range_to_reg(val); + data->target_rpm[i] =3D val; + } + + err =3D of_property_read_u32(child, "target-rpm", &val); + if (!err) + data->target_rpm[i] =3D val; =20 return 0; } @@ -573,6 +580,7 @@ static int max6639_init_client(struct i2c_client *clien= t, const struct device_node *np =3D dev->of_node; struct device_node *child; int i, err; + u8 target_duty; =20 /* Reset chip to default values, see below for GCONFIG setup */ err =3D regmap_write(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_P= OR); @@ -639,8 +647,9 @@ static int max6639_init_client(struct i2c_client *clien= t, if (err) return err; =20 - /* PWM 120/120 (i.e. 100%) */ - err =3D regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(i), 120); + /* Set PWM based on target RPM if specified */ + target_duty =3D 120 * data->target_rpm[i] / rpm_ranges[data->rpm_range[i= ]]; + err =3D regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(i), target_duty= ); if (err) return err; } base-commit: 2115cbeec8a3ccc69e3b7ecdf97b4472b0829cfc --=20 2.42.0