diff options
| author | Ji Sheng Teoh <jisheng.teoh@starfivetech.com> | 2024-05-08 13:47:27 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2024-05-27 01:32:57 +0100 |
| commit | 6cf3c0f84d40847843f86e8ead58c92602b2d80d (patch) | |
| tree | 1bb47d3de6244f24ea12c0988002c3e0a698c7a6 | |
| parent | f44b3730b038363475a3f84bee2038d8b6448ed8 (diff) | |
spi: spi-cadence: Add optional reset control support
Add optional reset control support for spi-cadence to properly bring
the SPI device into an operating condition.
Co-developed-by: Eng Lee Teh <englee.teh@starfivetech.com>
Signed-off-by: Eng Lee Teh <englee.teh@starfivetech.com>
Co-developed-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
Signed-off-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
Signed-off-by: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Link: https://msgid.link/r/20240508054728.1751162-2-jisheng.teoh@starfivetech.com
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi-cadence.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c index e5140532071d..4eacf3f6e031 100644 --- a/drivers/spi/spi-cadence.c +++ b/drivers/spi/spi-cadence.c @@ -18,6 +18,7 @@ #include <linux/of_address.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/reset.h> #include <linux/spi/spi.h> /* Name of this driver */ @@ -111,6 +112,7 @@ * @dev_busy: Device busy flag * @is_decoded_cs: Flag for decoder property set or not * @tx_fifo_depth: Depth of the TX FIFO + * @rstc: Optional reset control for SPI controller */ struct cdns_spi { void __iomem *regs; @@ -125,6 +127,7 @@ struct cdns_spi { u8 dev_busy; u32 is_decoded_cs; unsigned int tx_fifo_depth; + struct reset_control *rstc; }; /* Macros for the SPI controller read/write */ @@ -588,6 +591,16 @@ static int cdns_spi_probe(struct platform_device *pdev) goto remove_ctlr; } + xspi->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, "spi"); + if (IS_ERR(xspi->rstc)) { + ret = dev_err_probe(&pdev->dev, PTR_ERR(xspi->rstc), + "Cannot get SPI reset.\n"); + goto remove_ctlr; + } + + reset_control_assert(xspi->rstc); + reset_control_deassert(xspi->rstc); + if (!spi_controller_is_target(ctlr)) { xspi->ref_clk = devm_clk_get_enabled(&pdev->dev, "ref_clk"); if (IS_ERR(xspi->ref_clk)) { |