linux-kernel - [PATCH 4/4] fsi: Aspeed master: Set bus frequency from devicetree

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Message-Id: <20200910151840.25333-5-eajames@linux.ibm.com>
Date:   Thu, 10 Sep 2020 10:18:40 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     linux-clk@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-aspeed@...ts.ozlabs.org, linux-fsi@...ts.ozlabs.org,
        andrew@...id.au, joel@....id.au, robh+dt@...nel.org,
        sboyd@...nel.org, mturquette@...libre.com, alistair@...ple.id.au,
        jk@...abs.org
Subject: [PATCH 4/4] fsi: Aspeed master: Set bus frequency from devicetree

Set the FSI bus frequency based on the value encoded in the
devicetree. The default value is 166MHz, which is the highest
frequency some FSI slaves can accept.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
Reviewed-by: Joel Stanley <joel@....id.au>
---
 drivers/fsi/fsi-master-aspeed.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index c006ec008a1a..be19fee0bece 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -515,6 +515,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	struct fsi_master_aspeed *aspeed;
 	struct resource *res;
 	int rc, links, reg;
+	u32 bus_freq = 166666666;
 	__be32 raw;
 
 	rc = tacoma_cabled_fsi_fixup(&pdev->dev);
@@ -539,6 +540,10 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 		dev_err(aspeed->dev, "couldn't get clock\n");
 		return PTR_ERR(aspeed->clk);
 	}
+
+	of_property_read_u32(pdev->dev.of_node, "bus-frequency", &bus_freq);
+	clk_set_rate(aspeed->clk, bus_freq);
+
 	rc = clk_prepare_enable(aspeed->clk);
 	if (rc) {
 		dev_err(aspeed->dev, "couldn't enable clock\n");
-- 
2.26.2