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Tue, 9 Jul 2019 13:19:36 +0000 From: To: , , , , , , , , , , Subject: [PATCH v3 3/9] i2c: add support for filter-width-ns optional property Thread-Topic: [PATCH v3 3/9] i2c: add support for filter-width-ns optional property Thread-Index: AQHVNlj0GCZKeyvKs0qqPkVuYPgVhQ== Date: Tue, 9 Jul 2019 13:19:36 +0000 Message-ID: <1562678049-17581-4-git-send-email-eugen.hristev@microchip.com> References: <1562678049-17581-1-git-send-email-eugen.hristev@microchip.com> In-Reply-To: <1562678049-17581-1-git-send-email-eugen.hristev@microchip.com> Accept-Language: en-US, ro-RO Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: VI1PR08CA0141.eurprd08.prod.outlook.com (2603:10a6:800:d5::19) To DM5PR11MB1242.namprd11.prod.outlook.com (2603:10b6:3:14::8) x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.7.4 x-originating-ip: [94.177.32.154] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 777c6b67-bd39-473f-0632-08d7047016b0 x-microsoft-antispam: BCL:0; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eugen.Hristev@microchip.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Eugen Hristev This optional timing property specifies the width of the spikes on the i2c lines (in ns) that can be filtered out by built-in analog or digital filters which are embedded in some i2c controllers. Include it in the timings structure and read it as integer property. Signed-off-by: Eugen Hristev --- drivers/i2c/i2c-core-base.c | 2 ++ include/linux/i2c.h | 2 ++ 2 files changed, 4 insertions(+) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 9e43508..73d1c62 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -1658,6 +1658,8 @@ void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_de t->sda_fall_ns = t->scl_fall_ns; device_property_read_u32(dev, "i2c-sda-hold-time-ns", &t->sda_hold_ns); + + device_property_read_u32(dev, "i2c-filter-width-ns", &t->filter_width_ns); } EXPORT_SYMBOL_GPL(i2c_parse_fw_timings); diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 1308126..dfb6525 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -563,6 +563,7 @@ struct i2c_lock_operations { * @scl_int_delay_ns: time IP core additionally needs to setup SCL in ns * @sda_fall_ns: time SDA signal takes to fall in ns; t(f) in the I2C specification * @sda_hold_ns: time IP core additionally needs to hold SDA in ns + * @filter_width_ns: width in ns of spikes on i2c lines that the IP core can filter out */ struct i2c_timings { u32 bus_freq_hz; @@ -571,6 +572,7 @@ struct i2c_timings { u32 scl_int_delay_ns; u32 sda_fall_ns; u32 sda_hold_ns; + u32 filter_width_ns; }; /**