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| author | Stephan Gerhold <stephan.gerhold@kernkonzept.com> | 2023-09-19 13:59:49 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-09-25 14:19:37 +0200 |
| commit | 287fcdaa35fc666640f805310095c52f2d818d26 (patch) | |
| tree | ea13fac0b7d5eb6c2fe290161269b37e6b72cee2 /drivers/spi | |
| parent | spi: dt-bindings: qup: Document power-domains and OPP (diff) | |
| download | linux-287fcdaa35fc666640f805310095c52f2d818d26.tar.xz linux-287fcdaa35fc666640f805310095c52f2d818d26.zip | |
spi: qup: Parse OPP table for DVFS support
Parse the OPP table from the device tree and use dev_pm_opp_set_rate()
instead of clk_set_rate() to allow making performance state for power
domains specified in the OPP table.
This is needed to guarantee correct behavior of the clock, especially
with the higher clock/SPI bus frequencies.
Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
Link: https://lore.kernel.org/r/20230919-spi-qup-dvfs-v2-2-1bac2e9ab8db@kernkonzept.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-qup.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c index 4b6f6b25219b..bf043be3a2a9 100644 --- a/drivers/spi/spi-qup.c +++ b/drivers/spi/spi-qup.c @@ -12,6 +12,7 @@ #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> +#include <linux/pm_opp.h> #include <linux/pm_runtime.h> #include <linux/spi/spi.h> #include <linux/dmaengine.h> @@ -667,7 +668,7 @@ static int spi_qup_io_prep(struct spi_device *spi, struct spi_transfer *xfer) return -EIO; } - ret = clk_set_rate(controller->cclk, xfer->speed_hz); + ret = dev_pm_opp_set_rate(controller->dev, xfer->speed_hz); if (ret) { dev_err(controller->dev, "fail to set frequency %d", xfer->speed_hz); @@ -1027,6 +1028,15 @@ static int spi_qup_probe(struct platform_device *pdev) return -ENXIO; } + ret = devm_pm_opp_set_clkname(dev, "core"); + if (ret) + return ret; + + /* OPP table is optional */ + ret = devm_pm_opp_of_add_table(dev); + if (ret && ret != -ENODEV) + return dev_err_probe(dev, ret, "invalid OPP table\n"); + host = spi_alloc_host(dev, sizeof(struct spi_qup)); if (!host) { dev_err(dev, "cannot allocate host\n"); |