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spi: bcm63xx-hsspi: add reset support

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bcm63xx arch resets the HSSPI 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/20200616173235.3473149-3-noltari@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Álvaro Fernández Rojas 2020-06-16 19:32:35 +02:00 committed by Mark Brown
parent 38807adeaf
commit 0eeadddbf0
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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-hsspi.c
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@ -20,6 +20,7 @@
#include <linux/spi/spi.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/reset.h>
#define HSSPI_GLOBAL_CTRL_REG 0x0
#define GLOBAL_CTRL_CS_POLARITY_SHIFT 0
@ -334,6 +335,7 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
struct clk *clk, *pll_clk = NULL;
int irq, ret;
u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS;
struct reset_control *reset;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
@ -348,10 +350,20 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
if (IS_ERR(clk))
return PTR_ERR(clk);
reset = devm_reset_control_get_optional_exclusive(dev, NULL);
if (IS_ERR(reset))
return PTR_ERR(reset);
ret = clk_prepare_enable(clk);
if (ret)
return ret;
ret = reset_control_reset(reset);
if (ret) {
dev_err(dev, "unable to reset device: %d\n", ret);
goto out_disable_clk;
}
rate = clk_get_rate(clk);
if (!rate) {
pll_clk = devm_clk_get(dev, "pll");