linux-kernel - [PATCH v3 net-next 08/10] net: korina: Get mdio input clock via common clock framework

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Message-Id: <20210414230648.76129-9-tsbogend@alpha.franken.de>
Date:   Thu, 15 Apr 2021 01:06:45 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 net-next 08/10] net: korina: Get mdio input clock via common clock framework

With device tree clock is provided via CCF. For non device tree
use a maximum clock value to not overclock the PHY. The non device
tree usage will go away after platform is converted to DT.

Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
---
 drivers/net/ethernet/korina.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index 7646ccc9d7e8..62bb691c8354 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -57,14 +57,13 @@
 #include <linux/ethtool.h>
 #include <linux/crc32.h>
 #include <linux/pgtable.h>
+#include <linux/clk.h>
 
 #include <asm/bootinfo.h>
 #include <asm/bitops.h>
 #include <asm/io.h>
 #include <asm/dma.h>
 
-#include <asm/mach-rc32434/rb.h>
-#include <asm/mach-rc32434/rc32434.h>
 #include <asm/mach-rc32434/eth.h>
 #include <asm/mach-rc32434/dma_v.h>
 
@@ -146,10 +145,9 @@ struct korina_private {
 	struct work_struct restart_task;
 	struct net_device *dev;
 	struct device *dmadev;
+	int mii_clock_freq;
 };
 
-extern unsigned int idt_cpu_freq;
-
 static dma_addr_t korina_tx_dma(struct korina_private *lp, int idx)
 {
 	return lp->td_dma + (idx * sizeof(struct dma_desc));
@@ -897,8 +895,8 @@ static int korina_init(struct net_device *dev)
 
 	/* Management Clock Prescaler Divisor
 	 * Clock independent setting */
-	writel(((idt_cpu_freq) / MII_CLOCK + 1) & ~1,
-			&lp->eth_regs->ethmcp);
+	writel(((lp->mii_clock_freq) / MII_CLOCK + 1) & ~1,
+	       &lp->eth_regs->ethmcp);
 	writel(0, &lp->eth_regs->miimcfg);
 
 	/* don't transmit until fifo contains 48b */
@@ -1058,6 +1056,7 @@ static int korina_probe(struct platform_device *pdev)
 	u8 *mac_addr = dev_get_platdata(&pdev->dev);
 	struct korina_private *lp;
 	struct net_device *dev;
+	struct clk *clk;
 	void __iomem *p;
 	int rc;
 
@@ -1079,6 +1078,14 @@ static int korina_probe(struct platform_device *pdev)
 			eth_hw_addr_random(dev);
 	}
 
+	clk = devm_clk_get(&pdev->dev, NULL);
+	if (!IS_ERR(clk)) {
+		clk_prepare_enable(clk);
+		lp->mii_clock_freq = clk_get_rate(clk);
+	} else {
+		lp->mii_clock_freq = 200000000; /* max possible input clk */
+	}
+
 	lp->rx_irq = platform_get_irq_byname(pdev, "korina_rx");
 	lp->tx_irq = platform_get_irq_byname(pdev, "korina_tx");
 
-- 
2.29.2