From 9bdcdedc55c469556ca5c21ae129bd3ec0b19762 Mon Sep 17 00:00:00 2001 From: Janne Grunau Date: Sat, 11 Dec 2021 12:21:04 +0100 Subject: [PATCH 115/171] spi: parse CS delay values from DT Signed-off-by: Janne Grunau --- drivers/spi/spi.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index ea09d1b42bf6..c8342b950783 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2059,6 +2059,22 @@ void spi_flush_queue(struct spi_controller *ctlr) /*-------------------------------------------------------------------------*/ #if defined(CONFIG_OF) +static void of_spi_parse_dt_cs_delay(struct device_node *nc, + struct spi_delay *delay, const char *prop) +{ + u32 value; + + if (!of_property_read_u32(nc, prop, &value)) { + if (value > U16_MAX) { + delay->value = DIV_ROUND_UP(value, 1000); + delay->unit = SPI_DELAY_UNIT_USECS; + } else { + delay->value = value; + delay->unit = SPI_DELAY_UNIT_NSECS; + } + } +} + static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, struct device_node *nc) { @@ -2148,6 +2164,11 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, if (!of_property_read_u32(nc, "spi-max-frequency", &value)) spi->max_speed_hz = value; + /* Device CS delays */ + of_spi_parse_dt_cs_delay(nc, &spi->cs_setup, "spi-cs-setup-delay-ns"); + of_spi_parse_dt_cs_delay(nc, &spi->cs_hold, "spi-cs-hold-delay-ns"); + of_spi_parse_dt_cs_delay(nc, &spi->cs_inactive, "spi-cs-inactive-delay-ns"); + return 0; } -- 2.34.1