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spi: bcm63xx-spi: add reset support

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bcm63xx arch resets the SPI controller at early boot. However, bmips arch
needs to perform a reset when probing the driver.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20200616173235.3473149-2-noltari@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Álvaro Fernández Rojas 2020-06-16 19:32:34 +02:00 committed by Mark Brown
parent 42fd4f2513
commit 38807adeaf
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GPG key ID: 24D68B725D5487D0
1 changed files with 12 additions and 0 deletions
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12
drivers/spi/spi-bcm63xx.c
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@ -18,6 +18,7 @@
#include <linux/err.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/reset.h>
/* BCM 6338/6348 SPI core */
#define SPI_6348_RSET_SIZE 64
@ -493,6 +494,7 @@ static int bcm63xx_spi_probe(struct platform_device *pdev)
struct bcm63xx_spi *bs;
int ret;
u32 num_cs = BCM63XX_SPI_MAX_CS;
struct reset_control *reset;
if (dev->of_node) {
const struct of_device_id *match;
@ -529,6 +531,10 @@ static int bcm63xx_spi_probe(struct platform_device *pdev)
return PTR_ERR(clk);
}
reset = devm_reset_control_get_optional_exclusive(dev, NULL);
if (IS_ERR(reset))
return PTR_ERR(reset);
master = spi_alloc_master(dev, sizeof(*bs));
if (!master) {
dev_err(dev, "out of memory\n");
@ -579,6 +585,12 @@ static int bcm63xx_spi_probe(struct platform_device *pdev)
if (ret)
goto out_err;
ret = reset_control_reset(reset);
if (ret) {
dev_err(dev, "unable to reset device: %d\n", ret);
goto out_clk_disable;
}
bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
/* register and we are done */