From: <Eugen.Hristev@microchip.com>
To: <wsa@the-dreams.de>, <peda@axentia.se>, <mark.rutland@arm.com>,
<Ludovic.Desroches@microchip.com>, <linux-i2c@vger.kernel.org>,
<devicetree@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <alexandre.belloni@bootlin.com>,
<robh+dt@kernel.org>
Cc: Eugen.Hristev@microchip.com
Subject: [PATCH v5 5/9] i2c: at91: add support for digital filtering
Date: Wed, 11 Sep 2019 08:24:28 +0000 [thread overview]
Message-ID: <1568189911-31641-6-git-send-email-eugen.hristev@microchip.com> (raw)
In-Reply-To: <1568189911-31641-1-git-send-email-eugen.hristev@microchip.com>
From: Eugen Hristev <eugen.hristev@microchip.com>
Add new platform data support for digital filtering for i2c.
The sama5d4, sama5d2 and sam9x60 support this feature.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
drivers/i2c/busses/i2c-at91-core.c | 9 +++++++++
drivers/i2c/busses/i2c-at91-master.c | 9 +++++++++
drivers/i2c/busses/i2c-at91.h | 5 +++++
3 files changed, 23 insertions(+)
diff --git a/drivers/i2c/busses/i2c-at91-core.c b/drivers/i2c/busses/i2c-at91-core.c
index caf1846..e96360f 100644
--- a/drivers/i2c/busses/i2c-at91-core.c
+++ b/drivers/i2c/busses/i2c-at91-core.c
@@ -68,6 +68,7 @@ static struct at91_twi_pdata at91rm9200_config = {
.has_unre_flag = true,
.has_alt_cmd = false,
.has_hold_field = false,
+ .has_dig_filtr = false,
};
static struct at91_twi_pdata at91sam9261_config = {
@@ -76,6 +77,7 @@ static struct at91_twi_pdata at91sam9261_config = {
.has_unre_flag = false,
.has_alt_cmd = false,
.has_hold_field = false,
+ .has_dig_filtr = false,
};
static struct at91_twi_pdata at91sam9260_config = {
@@ -84,6 +86,7 @@ static struct at91_twi_pdata at91sam9260_config = {
.has_unre_flag = false,
.has_alt_cmd = false,
.has_hold_field = false,
+ .has_dig_filtr = false,
};
static struct at91_twi_pdata at91sam9g20_config = {
@@ -92,6 +95,7 @@ static struct at91_twi_pdata at91sam9g20_config = {
.has_unre_flag = false,
.has_alt_cmd = false,
.has_hold_field = false,
+ .has_dig_filtr = false,
};
static struct at91_twi_pdata at91sam9g10_config = {
@@ -100,6 +104,7 @@ static struct at91_twi_pdata at91sam9g10_config = {
.has_unre_flag = false,
.has_alt_cmd = false,
.has_hold_field = false,
+ .has_dig_filtr = false,
};
static const struct platform_device_id at91_twi_devtypes[] = {
@@ -130,6 +135,7 @@ static struct at91_twi_pdata at91sam9x5_config = {
.has_unre_flag = false,
.has_alt_cmd = false,
.has_hold_field = false,
+ .has_dig_filtr = false,
};
static struct at91_twi_pdata sama5d4_config = {
@@ -138,6 +144,7 @@ static struct at91_twi_pdata sama5d4_config = {
.has_unre_flag = false,
.has_alt_cmd = false,
.has_hold_field = true,
+ .has_dig_filtr = true,
};
static struct at91_twi_pdata sama5d2_config = {
@@ -146,6 +153,7 @@ static struct at91_twi_pdata sama5d2_config = {
.has_unre_flag = true,
.has_alt_cmd = true,
.has_hold_field = true,
+ .has_dig_filtr = true,
};
static struct at91_twi_pdata sam9x60_config = {
@@ -154,6 +162,7 @@ static struct at91_twi_pdata sam9x60_config = {
.has_unre_flag = true,
.has_alt_cmd = true,
.has_hold_field = true,
+ .has_dig_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 a3fcc35..df80557 100644
--- a/drivers/i2c/busses/i2c-at91-master.c
+++ b/drivers/i2c/busses/i2c-at91-master.c
@@ -31,12 +31,18 @@
void at91_init_twi_bus_master(struct at91_twi_dev *dev)
{
+ struct at91_twi_pdata *pdata = dev->pdata;
+
/* FIFO should be enabled immediately after the software reset */
if (dev->fifo_size)
at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_FIFOEN);
at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_MSEN);
at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_SVDIS);
at91_twi_write(dev, AT91_TWI_CWGR, dev->twi_cwgr_reg);
+
+ /* enable digital filter */
+ if (pdata->has_dig_filtr && dev->enable_dig_filt)
+ at91_twi_write(dev, AT91_TWI_FILTR, AT91_TWI_FILTR_FILT);
}
/*
@@ -793,6 +799,9 @@ int at91_twi_probe_master(struct platform_device *pdev,
dev_info(dev->dev, "Using FIFO (%u data)\n", dev->fifo_size);
}
+ dev->enable_dig_filt = of_property_read_bool(pdev->dev.of_node,
+ "i2c-digital-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 499b506..c75447e 100644
--- a/drivers/i2c/busses/i2c-at91.h
+++ b/drivers/i2c/busses/i2c-at91.h
@@ -84,6 +84,9 @@
#define AT91_TWI_ACR_DATAL(len) ((len) & 0xff)
#define AT91_TWI_ACR_DIR BIT(8)
+#define AT91_TWI_FILTR 0x0044
+#define AT91_TWI_FILTR_FILT BIT(0)
+
#define AT91_TWI_FMR 0x0050 /* FIFO Mode Register */
#define AT91_TWI_FMR_TXRDYM(mode) (((mode) & 0x3) << 0)
#define AT91_TWI_FMR_TXRDYM_MASK (0x3 << 0)
@@ -108,6 +111,7 @@ struct at91_twi_pdata {
bool has_unre_flag;
bool has_alt_cmd;
bool has_hold_field;
+ bool has_dig_filtr;
struct at_dma_slave dma_slave;
};
@@ -145,6 +149,7 @@ struct at91_twi_dev {
unsigned smr;
struct i2c_client *slave;
#endif
+ bool enable_dig_filt;
};
unsigned at91_twi_read(struct at91_twi_dev *dev, unsigned reg);
--
2.7.4
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next prev parent reply other threads:[~2019-09-11 8:25 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-11 8:24 [PATCH v5 0/9] i2c: add support for filters Eugen.Hristev
2019-09-11 8:24 ` [PATCH v5 1/9] dt-bindings: i2c: at91: add new compatible Eugen.Hristev
2019-09-11 8:24 ` [PATCH v5 2/9] dt-bindings: i2c: add bindings for i2c analog and digital filter Eugen.Hristev
2019-09-17 14:28 ` Rob Herring
2019-09-11 8:24 ` [PATCH v5 3/9] i2c: add support for filters optional properties Eugen.Hristev
2019-10-21 15:20 ` Peter Rosin
2019-09-11 8:24 ` [PATCH v5 4/9] i2c: at91: add new platform support for sam9x60 Eugen.Hristev
2019-09-11 8:24 ` Eugen.Hristev [this message]
2019-09-11 8:24 ` [PATCH v5 6/9] i2c: at91: add support for advanced digital filtering Eugen.Hristev
2019-09-11 8:24 ` [PATCH v5 7/9] i2c: at91: add support for analog filtering Eugen.Hristev
2019-09-11 8:24 ` [PATCH v5 8/9] ARM: dts: at91: sama5d2_xplained: add analog and digital filter for i2c Eugen.Hristev
2019-09-11 8:24 ` [PATCH v5 9/9] ARM: dts: at91: sama5d4_xplained: add " Eugen.Hristev
2019-09-14 19:32 ` [PATCH v5 0/9] i2c: add support for filters Ludovic Desroches
2019-10-07 7:53 ` Eugen.Hristev
2019-10-14 7:01 ` Eugen.Hristev
2019-10-21 14:05 ` Wolfram Sang
2019-10-21 15:23 ` Peter Rosin
2019-10-23 11:01 ` Eugen.Hristev
2019-10-23 12:19 ` Wolfram Sang
2019-10-24 18:30 ` Wolfram Sang
2019-10-25 10:05 ` Ludovic Desroches
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