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| author | Álvaro Fernández Rojas <noltari@gmail.com> | 2020-06-16 19:32:35 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-06-17 15:29:58 +0200 |
| commit | 0eeadddbf09a7a36ef1bc8021df1a770dc4b5370 (patch) | |
| tree | b60b7e35110a3bd607df90f5860f4985afe5c8b2 | |
| parent | spi: bcm63xx-spi: add reset support (diff) | |
| download | linux-0eeadddbf09a7a36ef1bc8021df1a770dc4b5370.tar.xz linux-0eeadddbf09a7a36ef1bc8021df1a770dc4b5370.zip | |
spi: bcm63xx-hsspi: add reset support
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>
| -rw-r--r-- | drivers/spi/spi-bcm63xx-hsspi.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/spi/spi-bcm63xx-hsspi.c b/drivers/spi/spi-bcm63xx-hsspi.c index 6c235306c0e4..9909b18f3c5a 100644 --- a/drivers/spi/spi-bcm63xx-hsspi.c +++ b/drivers/spi/spi-bcm63xx-hsspi.c @@ -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"); |