linux-kernel - [PATCH v13 21/35] spi: tegra20-slink: Add OPP support

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Date:   Mon, 27 Sep 2021 01:40:44 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Peter Chen <peter.chen@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Nishanth Menon <nm@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-pwm@...r.kernel.org,
        linux-mmc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        Mark Brown <broonie@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Richard Weinberger <richard@....at>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Lucas Stach <dev@...xeye.de>, Stefan Agner <stefan@...er.ch>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        David Heidelberg <david@...t.cz>
Subject: [PATCH v13 21/35] spi: tegra20-slink: Add OPP support

The SPI on Tegra belongs to the core power domain and we're going to
enable GENPD support for the core domain. Now SPI driver must use OPP
API for driving the controller's clock rate because OPP API takes care
of reconfiguring the domain's performance state in accordance to the
rate. Add OPP support to the driver.

Acked-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/spi/spi-tegra20-slink.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
index 3226c4e1c7c0..eea1853010e8 100644
--- a/drivers/spi/spi-tegra20-slink.c
+++ b/drivers/spi/spi-tegra20-slink.c
@@ -18,12 +18,15 @@
 #include <linux/kthread.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_opp.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/reset.h>
 #include <linux/spi/spi.h>
 
+#include <soc/tegra/common.h>
+
 #define SLINK_COMMAND			0x000
 #define SLINK_BIT_LENGTH(x)		(((x) & 0x1f) << 0)
 #define SLINK_WORD_SIZE(x)		(((x) & 0x1f) << 5)
@@ -680,7 +683,7 @@ static int tegra_slink_start_transfer_one(struct spi_device *spi,
 	bits_per_word = t->bits_per_word;
 	speed = t->speed_hz;
 	if (speed != tspi->cur_speed) {
-		clk_set_rate(tspi->clk, speed * 4);
+		dev_pm_opp_set_rate(tspi->dev, speed * 4);
 		tspi->cur_speed = speed;
 	}
 
@@ -1082,6 +1085,11 @@ static int tegra_slink_probe(struct platform_device *pdev)
 	init_completion(&tspi->xfer_completion);
 
 	pm_runtime_enable(&pdev->dev);
+
+	ret = devm_tegra_core_dev_init_opp_table_common(&pdev->dev);
+	if (ret)
+		goto exit_pm_disable;
+
 	ret = pm_runtime_resume_and_get(&pdev->dev);
 	if (ret) {
 		dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret);
-- 
2.32.0