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Tue, 10 Mar 2026 19:01:24 -0700 (PDT) Received: from localhost.localdomain ([50.21.71.60]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8cda1fbcd2esm46308185a.5.2026.03.10.19.01.23 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 10 Mar 2026 19:01:24 -0700 (PDT) From: Neel Bullywon To: lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org Cc: dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Neel Bullywon Subject: [PATCH] iio: frequency: adf4350: replace loop with order_base_2() Date: Tue, 10 Mar 2026 22:01:15 -0400 Message-ID: <20260311020115.56321-1-neelb2403@gmail.com> X-Mailer: git-send-email 2.44.0 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" Address the TODO in adf4350_set_freq() by replacing the iterative power-of-2 shift loop with the standard order_base_2() macro. By utilizing DIV_ROUND_UP_ULL(), we can calculate the required RF divider selection in a single step. This ensures freq is properly shifted to meet or exceed the minimum VCO frequency. Signed-off-by: Neel Bullywon --- drivers/iio/frequency/adf4350.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf435= 0.c index ed1741165f55..e07be6d5e67e 100644 --- a/drivers/iio/frequency/adf4350.c +++ b/drivers/iio/frequency/adf4350.c @@ -17,6 +17,8 @@ #include #include #include +#include +#include #include #include #include @@ -149,18 +151,12 @@ static int adf4350_set_freq(struct adf4350_state *st,= unsigned long long freq) if (freq > ADF4350_MAX_OUT_FREQ || freq < st->min_out_freq) return -EINVAL; =20 - st->r4_rf_div_sel =3D 0; - /* - * !\TODO: The below computation is making sure we get a power of 2 - * shift (st->r4_rf_div_sel) so that freq becomes higher or equal to - * ADF4350_MIN_VCO_FREQ. This might be simplified with fls()/fls_long() - * and friends. + * Calculate the required RF divider selection (power of 2 shift) + * to ensure the VCO frequency is >=3D ADF4350_MIN_VCO_FREQ. */ - while (freq < ADF4350_MIN_VCO_FREQ) { - freq <<=3D 1; - st->r4_rf_div_sel++; - } + st->r4_rf_div_sel =3D order_base_2(DIV_ROUND_UP_ULL(ADF4350_MIN_VCO_FREQ,= freq)); + freq <<=3D st->r4_rf_div_sel; =20 if (freq > ADF4350_MAX_FREQ_45_PRESC) { prescaler =3D ADF4350_REG1_PRESCALER; --=20 2.44.0