[PATCH v5 net-next 08/10] net: korina: Get mdio input clock via common clock framework

Thomas Bogendoerfer
2021-04-16T08:52:45Z

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@alpha.franken.de>
---
drivers/net/ethernet/korina.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index cd078a5c679b..e95c8d87d893 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));
@@ -899,8 +897,8 @@ 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 */
@@ -1060,6 +1058,7 @@ 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;

@@ -1077,6 +1076,16 @@ static int korina_probe(struct platform_device *pdev)
eth_hw_addr_random(dev);
}

+ clk = devm_clk_get_optional(&pdev->dev, "mdioclk");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+ if (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