linux-kernel - [RFC/PATCH 4/5] spi: spi-geni-qcom: Use OPP API to set clk/perf state

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Date:   Mon, 28 Jan 2019 17:55:46 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-spi@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Doug Anderson <dianders@...omium.org>
Subject: [RFC/PATCH 4/5] spi: spi-geni-qcom: Use OPP API to set clk/perf state

From: Rajendra Nayak <rnayak@...eaurora.org>

geni spi needs to express a perforamnce state requirement on CX
depending on the frequency of the clock rates. Use OPP table from
DT to register with OPP framework and use dev_pm_opp_set_rate() to
set the clk/perf state.

Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/spi/spi-geni-qcom.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
index fdb7cb88fb56..3ffb6b25b58d 100644
--- a/drivers/spi/spi-geni-qcom.c
+++ b/drivers/spi/spi-geni-qcom.c
@@ -116,9 +116,9 @@ static int get_spi_clk_cfg(unsigned int speed_hz,
 
 	dev_dbg(mas->dev, "req %u=>%u sclk %lu, idx %d, div %d\n", speed_hz,
 				actual_hz, sclk_freq, *clk_idx, *clk_div);
-	ret = clk_set_rate(se->clk, sclk_freq);
+	ret = dev_pm_opp_set_rate(mas->dev, sclk_freq);
 	if (ret)
-		dev_err(mas->dev, "clk_set_rate failed %d\n", ret);
+		dev_err(mas->dev, "dev_pm_opp_set_rate failed %d\n", ret);
 	return ret;
 }
 
@@ -564,6 +564,12 @@ static int spi_geni_probe(struct platform_device *pdev)
 	if (!spi)
 		return -ENOMEM;
 
+	ret = dev_pm_opp_of_add_table(&pdev->dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to init OPP table: %d\n", ret);
+		return ret;
+	}
+
 	platform_set_drvdata(pdev, spi);
 	mas = spi_master_get_devdata(spi);
 	mas->irq = irq;
@@ -629,6 +635,8 @@ static int __maybe_unused spi_geni_runtime_suspend(struct device *dev)
 	struct spi_master *spi = dev_get_drvdata(dev);
 	struct spi_geni_master *mas = spi_master_get_devdata(spi);
 
+	/* Drop the performance state vote */
+	dev_pm_opp_set_rate(dev, 0);
 	return geni_se_resources_off(&mas->se);
 }
 
-- 
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