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Fri, 8 Oct 2021 08:44:10 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node2.st.com [10.75.127.5]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 56230214D26; Fri, 8 Oct 2021 08:44:10 +0200 (CEST) Received: from lmecxl0573.lme.st.com (10.75.127.46) by SFHDAG2NODE2.st.com (10.75.127.5) with Microsoft SMTP Server (TLS) id 15.0.1497.18; Fri, 8 Oct 2021 08:44:09 +0200 Subject: Re: [PATCH v1 6/7] i2c: stm32f7: add support for DNF i2c-digital-filter binding To: CC: Patrick DELAUNAY , U-Boot STM32 , Heiko Schocher References: <20210803100515.29383-1-patrice.chotard@foss.st.com> <20210803100515.29383-7-patrice.chotard@foss.st.com> From: Patrice CHOTARD Message-ID: Date: Fri, 8 Oct 2021 08:44:09 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20210803100515.29383-7-patrice.chotard@foss.st.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.75.127.46] X-ClientProxiedBy: SFHDAG2NODE2.st.com (10.75.127.5) To SFHDAG2NODE2.st.com (10.75.127.5) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.391,FMLib:17.0.607.475 definitions=2021-10-08_02,2021-10-07_02,2020-04-07_01 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.34 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.2 at phobos.denx.de X-Virus-Status: Clean Hi On 8/3/21 12:05 PM, Patrice Chotard wrote: > From: Patrick Delaunay > > Add the support for the i2c-digital-filter binding, allowing to enable > the digital filter via the device-tree and indicate its value in the DT > > Signed-off-by: Patrick Delaunay > Signed-off-by: Patrice Chotard > --- > > drivers/i2c/stm32f7_i2c.c | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/drivers/i2c/stm32f7_i2c.c b/drivers/i2c/stm32f7_i2c.c > index 7e6c65fadc..2b2dae67a3 100644 > --- a/drivers/i2c/stm32f7_i2c.c > +++ b/drivers/i2c/stm32f7_i2c.c > @@ -107,7 +107,6 @@ struct stm32_i2c_regs { > > #define STM32_I2C_MAX_LEN 0xff > > -#define STM32_I2C_DNF_DEFAULT 0 > #define STM32_I2C_DNF_MAX 15 > > #define STM32_I2C_ANALOG_FILTER_DELAY_MIN 50 /* ns */ > @@ -204,6 +203,7 @@ struct stm32_i2c_timings { > * @regmap_sreg: register address for setting Fast Mode Plus bits > * @regmap_creg: register address for clearing Fast Mode Plus bits > * @regmap_mask: mask for Fast Mode Plus bits > + * @dnf_dt: value of digital filter requested via dt > */ > struct stm32_i2c_priv { > struct stm32_i2c_regs *regs; > @@ -214,6 +214,7 @@ struct stm32_i2c_priv { > u32 regmap_sreg; > u32 regmap_creg; > u32 regmap_mask; > + u32 dnf_dt; > }; > > static const struct stm32_i2c_spec i2c_specs[] = { > @@ -684,6 +685,7 @@ static int stm32_i2c_compute_timing(struct stm32_i2c_priv *i2c_priv, > const struct stm32_i2c_spec *specs; > struct stm32_i2c_timings *v, *_v; > struct list_head solutions; > + u32 i2cclk = DIV_ROUND_CLOSEST(STM32_NSEC_PER_SEC, setup->clock_src); > int ret; > > specs = get_specs(setup->speed_freq); > @@ -701,6 +703,8 @@ static int stm32_i2c_compute_timing(struct stm32_i2c_priv *i2c_priv, > return -EINVAL; > } > > + /* Analog and Digital Filters */ > + setup->dnf = DIV_ROUND_CLOSEST(i2c_priv->dnf_dt, i2cclk); > if (setup->dnf > STM32_I2C_DNF_MAX) { > log_err("DNF out of bound %d/%d\n", > setup->dnf, STM32_I2C_DNF_MAX); > @@ -923,7 +927,10 @@ static int stm32_of_to_plat(struct udevice *dev) > fall_time = dev_read_u32_default(dev, "i2c-scl-falling-time-ns", > STM32_I2C_FALL_TIME_DEFAULT); > > - i2c_priv->setup.dnf = STM32_I2C_DNF_DEFAULT; > + i2c_priv->dnf_dt = dev_read_u32_default(dev, "i2c-digital-filter-width-ns", 0); > + if (!dev_read_bool(dev, "i2c-digital-filter")) > + i2c_priv->dnf_dt = 0; > + > i2c_priv->setup.analog_filter = dev_read_bool(dev, "i2c-analog-filter"); > > /* Optional */ > Applied on u-boot-stm32 for next Thanks Patrice