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Wed, 11 Sep 2019 08:24:34 +0000 From: To: , , , , , , , , , CC: , Subject: [PATCH v5 7/9] i2c: at91: add support for analog filtering Thread-Topic: [PATCH v5 7/9] i2c: at91: add support for analog filtering Thread-Index: AQHVaHpXDHMdOo/14EOByNt7NRfDtA== Date: Wed, 11 Sep 2019 08:24:34 +0000 Message-ID: <1568189911-31641-8-git-send-email-eugen.hristev@microchip.com> References: <1568189911-31641-1-git-send-email-eugen.hristev@microchip.com> In-Reply-To: <1568189911-31641-1-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: VI1P189CA0008.EURP189.PROD.OUTLOOK.COM (2603:10a6:802:2a::21) To DM5PR11MB1242.namprd11.prod.outlook.com (2603:10b6:3:14::8) x-mailer: git-send-email 2.7.4 x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [94.177.32.156] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: fca19e3b-5e54-4570-09e1-08d736917a05 x-microsoft-antispam: BCL:0; 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SRVR:DM5PR11MB1452; H:DM5PR11MB1242.namprd11.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: microchip.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: fN+cslpRznAr1qorHQkVXgBJ1QOM4xxRRZjDLNiiM7GHEoEbUsKUJITWWCmtPy8mtRuM1nwGKWGpPb+Q0AobmQaB7VMIZuquQPw7ZfHdJK9IK+S5KWwuQJ0Kl7uiOI0sGGddR3I1bcSWaSF+ZzzH1yBfMcRUVy501xdektQJV+U4fHo3DBQ49Uae7emC3ANl/QDDABMT/2j9nWNmJ0MPHwk4617+caOwUy88NcgdU5aglXwk0To2E47W/lJ5kXRIUA3josIOIe+Nlyg2MIQ3zVe8V8MedcV0PrwWbH1cWj1l+lYeDgYnJMvOy7xLBqZVkGneCwtWmwRRllMfwwnfR6xydUvgzCod1iceXlyhMhGfiymy2SKtOfiU54UK2ah0+JSHjP8s4iPD/V8F6uIT/En1IMeO22miIZuLw0TKO3s= MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: fca19e3b-5e54-4570-09e1-08d736917a05 X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Sep 2019 08:24:34.3611 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: R8PYw0da6n6+xgtm9Ce03bY6ou9hL4avB4Wk3zje/wjjIOt7bc0ka4/ij2xgBEkdSCiBcKKVCfa1kd4Nn8y8xMdiw0TEyjDWBcKPPaGjTs8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR11MB1452 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: Eugen Hristev Add support for analog filtering for i2c lines. The sama5d2 and sam9x60 support this feature. Signed-off-by: Eugen Hristev --- drivers/i2c/busses/i2c-at91-core.c | 9 +++++++++ drivers/i2c/busses/i2c-at91-master.c | 18 ++++++++++++++---- drivers/i2c/busses/i2c-at91.h | 3 +++ 3 files changed, 26 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-at91-core.c b/drivers/i2c/busses/i2c-at91-core.c index 1f4ee7e..e13af48 100644 --- a/drivers/i2c/busses/i2c-at91-core.c +++ b/drivers/i2c/busses/i2c-at91-core.c @@ -70,6 +70,7 @@ static struct at91_twi_pdata at91rm9200_config = { .has_hold_field = false, .has_dig_filtr = false, .has_adv_dig_filtr = false, + .has_ana_filtr = false, }; static struct at91_twi_pdata at91sam9261_config = { @@ -80,6 +81,7 @@ static struct at91_twi_pdata at91sam9261_config = { .has_hold_field = false, .has_dig_filtr = false, .has_adv_dig_filtr = false, + .has_ana_filtr = false, }; static struct at91_twi_pdata at91sam9260_config = { @@ -90,6 +92,7 @@ static struct at91_twi_pdata at91sam9260_config = { .has_hold_field = false, .has_dig_filtr = false, .has_adv_dig_filtr = false, + .has_ana_filtr = false, }; static struct at91_twi_pdata at91sam9g20_config = { @@ -100,6 +103,7 @@ static struct at91_twi_pdata at91sam9g20_config = { .has_hold_field = false, .has_dig_filtr = false, .has_adv_dig_filtr = false, + .has_ana_filtr = false, }; static struct at91_twi_pdata at91sam9g10_config = { @@ -110,6 +114,7 @@ static struct at91_twi_pdata at91sam9g10_config = { .has_hold_field = false, .has_dig_filtr = false, .has_adv_dig_filtr = false, + .has_ana_filtr = false, }; static const struct platform_device_id at91_twi_devtypes[] = { @@ -142,6 +147,7 @@ static struct at91_twi_pdata at91sam9x5_config = { .has_hold_field = false, .has_dig_filtr = false, .has_adv_dig_filtr = false, + .has_ana_filtr = false, }; static struct at91_twi_pdata sama5d4_config = { @@ -152,6 +158,7 @@ static struct at91_twi_pdata sama5d4_config = { .has_hold_field = true, .has_dig_filtr = true, .has_adv_dig_filtr = false, + .has_ana_filtr = false, }; static struct at91_twi_pdata sama5d2_config = { @@ -162,6 +169,7 @@ static struct at91_twi_pdata sama5d2_config = { .has_hold_field = true, .has_dig_filtr = true, .has_adv_dig_filtr = true, + .has_ana_filtr = true, }; static struct at91_twi_pdata sam9x60_config = { @@ -172,6 +180,7 @@ static struct at91_twi_pdata sam9x60_config = { .has_hold_field = true, .has_dig_filtr = true, .has_adv_dig_filtr = true, + .has_ana_filtr = true, }; static const struct of_device_id atmel_twi_dt_ids[] = { diff --git a/drivers/i2c/busses/i2c-at91-master.c b/drivers/i2c/busses/i2c-at91-master.c index 273bd8b..6e0b554 100644 --- a/drivers/i2c/busses/i2c-at91-master.c +++ b/drivers/i2c/busses/i2c-at91-master.c @@ -32,6 +32,7 @@ void at91_init_twi_bus_master(struct at91_twi_dev *dev) { struct at91_twi_pdata *pdata = dev->pdata; + u32 filtr = 0; /* FIFO should be enabled immediately after the software reset */ if (dev->fifo_size) @@ -42,13 +43,20 @@ void at91_init_twi_bus_master(struct at91_twi_dev *dev) /* enable digital filter */ if (pdata->has_dig_filtr && dev->enable_dig_filt) - at91_twi_write(dev, AT91_TWI_FILTR, AT91_TWI_FILTR_FILT); + filtr |= AT91_TWI_FILTR_FILT; /* enable advanced digital filter */ if (pdata->has_adv_dig_filtr && dev->enable_dig_filt) - at91_twi_write(dev, AT91_TWI_FILTR, AT91_TWI_FILTR_FILT | - (AT91_TWI_FILTR_THRES(dev->filter_width) & - AT91_TWI_FILTR_THRES_MASK)); + filtr |= AT91_TWI_FILTR_FILT | + (AT91_TWI_FILTR_THRES(dev->filter_width) & + AT91_TWI_FILTR_THRES_MASK); + + /* enable analog filter */ + if (pdata->has_ana_filtr && dev->enable_ana_filt) + filtr |= AT91_TWI_FILTR_PADFEN; + + if (filtr) + at91_twi_write(dev, AT91_TWI_FILTR, filtr); } /* @@ -826,6 +834,8 @@ int at91_twi_probe_master(struct platform_device *pdev, dev->enable_dig_filt = of_property_read_bool(pdev->dev.of_node, "i2c-digital-filter"); + dev->enable_ana_filt = of_property_read_bool(pdev->dev.of_node, + "i2c-analog-filter"); at91_calc_twi_clock(dev); dev->adapter.algo = &at91_twi_algorithm; diff --git a/drivers/i2c/busses/i2c-at91.h b/drivers/i2c/busses/i2c-at91.h index d7cf01e3..977a67b 100644 --- a/drivers/i2c/busses/i2c-at91.h +++ b/drivers/i2c/busses/i2c-at91.h @@ -86,6 +86,7 @@ #define AT91_TWI_FILTR 0x0044 #define AT91_TWI_FILTR_FILT BIT(0) +#define AT91_TWI_FILTR_PADFEN BIT(1) #define AT91_TWI_FILTR_THRES(v) ((v) << 8) #define AT91_TWI_FILTR_THRES_MAX 7 #define AT91_TWI_FILTR_THRES_MASK GENMASK(10, 8) @@ -116,6 +117,7 @@ struct at91_twi_pdata { bool has_hold_field; bool has_dig_filtr; bool has_adv_dig_filtr; + bool has_ana_filtr; struct at_dma_slave dma_slave; }; @@ -154,6 +156,7 @@ struct at91_twi_dev { struct i2c_client *slave; #endif bool enable_dig_filt; + bool enable_ana_filt; u32 filter_width; };