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i2c: at91: add support for digital filtering

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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>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Reviewed-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Eugen Hristev 2019-09-11 08:24:28 +00:00 committed by Wolfram Sang
parent b002779237
commit 2989b45923
3 changed files with 23 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/i2c/busses/i2c-at91-core.c
View file

@ -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[] = {

9
drivers/i2c/busses/i2c-at91-master.c
View file

@ -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;

5
drivers/i2c/busses/i2c-at91.h
View file

@ -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);