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authorStephan Gerhold <stephan.gerhold@kernkonzept.com>2023-09-19 13:59:49 +0200
committerMark Brown <broonie@kernel.org>2023-09-25 14:19:37 +0200
commit287fcdaa35fc666640f805310095c52f2d818d26 (patch)
treeea13fac0b7d5eb6c2fe290161269b37e6b72cee2 /drivers
parentspi: dt-bindings: qup: Document power-domains and OPP (diff)
downloadlinux-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')
-rw-r--r--drivers/spi/spi-qup.c12
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");