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Tue, 20 May 2025 14:01:20 -0700 (PDT) From: David Lechner Date: Tue, 20 May 2025 16:00:46 -0500 Subject: [PATCH 3/3] pwm: axi-pwmgen: add support for external clock Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250520-pwm-axi-pwmgen-add-external-clock-v1-3-6cd63cc001c8@baylibre.com> References: <20250520-pwm-axi-pwmgen-add-external-clock-v1-0-6cd63cc001c8@baylibre.com> In-Reply-To: <20250520-pwm-axi-pwmgen-add-external-clock-v1-0-6cd63cc001c8@baylibre.com> To: Michael Hennerich , =?utf-8?q?Nuno_S=C3=A1?= , Trevor Gamblin , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, David Lechner X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1679; i=dlechner@baylibre.com; h=from:subject:message-id; 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In most cases, there is a separate external clock that drives the PWM output separate from the peripheral clock. This allows enabling both clocks. Signed-off-by: David Lechner --- drivers/pwm/pwm-axi-pwmgen.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/pwm/pwm-axi-pwmgen.c b/drivers/pwm/pwm-axi-pwmgen.c index 4337c8f5acf055fc87dc134f2a70b99b0cb5ede6..67992a7561ec0440b1c1fa327f8= 44a0602872771 100644 --- a/drivers/pwm/pwm-axi-pwmgen.c +++ b/drivers/pwm/pwm-axi-pwmgen.c @@ -280,9 +280,26 @@ static int axi_pwmgen_probe(struct platform_device *pd= ev) ddata =3D pwmchip_get_drvdata(chip); ddata->regmap =3D regmap; =20 - clk =3D devm_clk_get_enabled(dev, NULL); - if (IS_ERR(clk)) - return dev_err_probe(dev, PTR_ERR(clk), "failed to get clock\n"); + /* When clock-names is present, there is a separate ext clock. */ + if (device_property_present(dev, "clock-names")) { + struct clk *axi_clk; + + axi_clk =3D devm_clk_get_enabled(dev, "axi"); + if (IS_ERR(axi_clk)) + return dev_err_probe(dev, PTR_ERR(axi_clk), + "failed to get axi clock\n"); + + clk =3D devm_clk_get_enabled(dev, "ext"); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), + "failed to get ext clock\n"); + } else { + /* Otherwise, a single clock does everything. */ + clk =3D devm_clk_get_enabled(dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), + "failed to get clock\n"); + } =20 ret =3D devm_clk_rate_exclusive_get(dev, clk); if (ret) --=20 2.43.0