linux-kernel - [PATCH 19/21] spi: spi-qcom-qspi: Use OPP API to set clk/perf state

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Date:   Wed,  8 Apr 2020 19:16:45 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     viresh.kumar@...aro.org, sboyd@...nel.org,
        bjorn.andersson@...aro.org, agross@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Alok Chauhan <alokc@...eaurora.org>,
        Akash Asthana <akashast@...eaurora.org>,
        linux-spi@...r.kernel.org
Subject: [PATCH 19/21] spi: spi-qcom-qspi: Use OPP API to set clk/perf state

QSPI needs to vote on a performance state of a power domain depending on
the clock rate. Add support for it by specifying the perf state/clock rate
as an OPP table in device tree.

Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
Cc: Alok Chauhan <alokc@...eaurora.org>
Cc: Akash Asthana <akashast@...eaurora.org>
Cc: linux-spi@...r.kernel.org
---
 drivers/spi/spi-qcom-qspi.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c
index 3c4f83b..42a9511 100644
--- a/drivers/spi/spi-qcom-qspi.c
+++ b/drivers/spi/spi-qcom-qspi.c
@@ -8,6 +8,7 @@
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_opp.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/spi-mem.h>
 
@@ -235,7 +236,7 @@ static int qcom_qspi_transfer_one(struct spi_master *master,
 		speed_hz = xfer->speed_hz;
 
 	/* In regular operation (SBL_EN=1) core must be 4x transfer clock */
-	ret = clk_set_rate(ctrl->clks[QSPI_CLK_CORE].clk, speed_hz * 4);
+	ret = dev_pm_opp_set_rate(ctrl->dev, speed_hz * 4);
 	if (ret) {
 		dev_err(ctrl->dev, "Failed to set core clk %d\n", ret);
 		return ret;
@@ -481,6 +482,9 @@ static int qcom_qspi_probe(struct platform_device *pdev)
 	master->handle_err = qcom_qspi_handle_err;
 	master->auto_runtime_pm = true;
 
+	dev_pm_opp_set_clkname(&pdev->dev, "core");
+	dev_pm_opp_of_add_table(&pdev->dev);
+
 	pm_runtime_enable(dev);
 
 	ret = spi_register_master(master);
@@ -490,6 +494,7 @@ static int qcom_qspi_probe(struct platform_device *pdev)
 	pm_runtime_disable(dev);
 
 exit_probe_master_put:
+	dev_pm_opp_of_remove_table(&pdev->dev);
 	spi_master_put(master);
 
 	return ret;
@@ -499,6 +504,8 @@ static int qcom_qspi_remove(struct platform_device *pdev)
 {
 	struct spi_master *master = platform_get_drvdata(pdev);
 
+	dev_pm_opp_of_remove_table(&pdev->dev);
+
 	/* Unregister _before_ disabling pm_runtime() so we stop transfers */
 	spi_unregister_master(master);
 
@@ -512,6 +519,7 @@ static int __maybe_unused qcom_qspi_runtime_suspend(struct device *dev)
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct qcom_qspi *ctrl = spi_master_get_devdata(master);
 
+	dev_pm_opp_set_rate(dev, 0);
 	clk_bulk_disable_unprepare(QSPI_NUM_CLKS, ctrl->clks);
 
 	return 0;
-- 
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