From nobody Thu Apr 2 15:43:34 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C3CD3E571; Wed, 11 Feb 2026 02:51:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770778278; cv=none; b=iSsvHuMkmKHKuOwSdxgqxwaAbyQ/FyBgLV3uGj9thlPqiex9Vzo/rQY0gANRgt+O2tbFmMmTz9M+xdAVvsG0/7QCtL/vctW4YeYR+C4SsD6tLEa5rE+PADeNhFhA4CmDgwsGbj6BOkXh5hahcwIKQCmgs2WL/xND7LgafMJU2Kg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770778278; c=relaxed/simple; bh=1GxIRq0M/Ac05VjnTuETx3JR4hJQBaKCQzPGiFTReQE=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=XVycb6Q0FZlgkCFwDRtZr6f/16yRKZs78RvLY0BgAREG05XJHWx/0DeRGRevu0YWHq2Awtnh6Tj6YGevZJEyeQ+gDKetQ54xcKjfEk1S9CApDcx8X21hmQsa1DU/921lVTpz6YcfSGixBc/LmjzQSSRSsyrSwU9cugkMzETxslI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.20.42.101]) by gateway (Coremail) with SMTP id _____8DxAfGg7otpZZoRAA--.56237S3; Wed, 11 Feb 2026 10:51:13 +0800 (CST) Received: from loongson-pc.loongson.cn (unknown [10.20.42.101]) by front1 (Coremail) with SMTP id qMiowJBx68Gg7otpXEFEAA--.60027S2; Wed, 11 Feb 2026 10:51:12 +0800 (CST) From: Hongliang Wang To: Binbin Zhou , Andi Shyti , Hongliang Wang Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev Subject: [PATCH v1] LoongArch: add i2c clocks and clock-div parameter parsing. Date: Wed, 11 Feb 2026 10:50:57 +0800 Message-Id: <20260211025057.29746-1-wanghongliang@loongson.cn> X-Mailer: git-send-email 2.20.1 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 X-CM-TRANSID: qMiowJBx68Gg7otpXEFEAA--.60027S2 X-CM-SenderInfo: pzdqwxxrqjzxhdqjqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBj93XoW7Zw4xZr13CFykCFyUAr15KFX_yoW8Ar1fpa yUKFZYkr1qgF1agr4DJryxWFyYyws5JFW0kF17Awn7Wan3XrykXay3tFnIkFykWFyfuayx ZayDKrW3CF1avrcCm3ZEXasCq-sJn29KB7ZKAUJUUUU5529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUkjb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Jr0_Gr1l84ACjcxK6I8E87Iv67AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_ Gr0_Gr1UM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx1l5I 8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1Y6r17McIj6I8E87Iv67AK xVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64 vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8G jcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2I x0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK 8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I 0E14v26r1j6r4UYxBIdaVFxhVjvjDU0xZFpf9x07UNvtZUUUUU= Content-Type: text/plain; charset="utf-8" On 3A/7A/2K platform, i2c ref clocks and clock divisor maybe different, through firmware parameter passing, "clocks" and "clock-div" are used to describe i2c ref clocks and divisor. Signed-off-by: Hongliang Wang --- drivers/i2c/busses/i2c-ls2x.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-ls2x.c b/drivers/i2c/busses/i2c-ls2x.c index b475dd27b7af..562bf32a9d6c 100644 --- a/drivers/i2c/busses/i2c-ls2x.c +++ b/drivers/i2c/busses/i2c-ls2x.c @@ -96,6 +96,8 @@ static irqreturn_t ls2x_i2c_isr(int this_irq, void *dev_i= d) static void ls2x_i2c_adjust_bus_speed(struct ls2x_i2c_priv *priv) { u16 val; + u32 pclk; + u32 div; struct i2c_timings *t =3D &priv->i2c_t; struct device *dev =3D priv->adapter.dev.parent; u32 acpi_speed =3D i2c_acpi_find_bus_speed(dev); @@ -107,12 +109,16 @@ static void ls2x_i2c_adjust_bus_speed(struct ls2x_i2c= _priv *priv) else t->bus_freq_hz =3D LS2X_I2C_FREQ_STD; =20 + if (!device_property_read_u32(dev, "clocks", &pclk) && + !device_property_read_u32(dev, "clock-div", &div) && div !=3D 0) + val =3D (pclk * 10) / (div * t->bus_freq_hz) - 1; + else + val =3D LS2X_I2C_PCLK_FREQ / (5 * t->bus_freq_hz) - 1; /* * According to the chip manual, we can only access the registers as byte= s, * otherwise the high bits will be truncated. * So set the I2C frequency with a sequential writeb() instead of writew(= ). */ - val =3D LS2X_I2C_PCLK_FREQ / (5 * t->bus_freq_hz) - 1; writeb(FIELD_GET(GENMASK(7, 0), val), priv->base + I2C_LS2X_PRER_LO); writeb(FIELD_GET(GENMASK(15, 8), val), priv->base + I2C_LS2X_PRER_HI); } --=20 2.47.2