[PATCH net-next v8 3/9] net: txgbe: Register fixed rate clock

Jiawen Wu
2023-05-15T06:34:33Z

In order for I2C to be able to work in standard mode, register a fixed
rate clock for each I2C device.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
drivers/net/ethernet/wangxun/Kconfig | 1 +
.../net/ethernet/wangxun/txgbe/txgbe_phy.c | 41 +++++++++++++++++++
.../net/ethernet/wangxun/txgbe/txgbe_type.h | 2 +
3 files changed, 44 insertions(+)

diff --git a/drivers/net/ethernet/wangxun/Kconfig b/drivers/net/ethernet/wangxun/Kconfig
index c9d88673d306..a62614eeed2e 100644
--- a/drivers/net/ethernet/wangxun/Kconfig
+++ b/drivers/net/ethernet/wangxun/Kconfig
@@ -40,6 +40,7 @@ config NGBE
config TXGBE
tristate "Wangxun(R) 10GbE PCI Express adapters support"
depends on PCI
+ select COMMON_CLK
select LIBWX
help
This driver supports Wangxun(R) 10GbE PCI Express family of
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
index 3476074869cb..f1c455d799f3 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
@@ -2,6 +2,8 @@
/* Copyright (c) 2015 - 2023 Beijing WangXun Technology Co., Ltd. */

#include <linux/gpio/property.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
#include <linux/i2c.h>
#include <linux/pci.h>

@@ -70,6 +72,32 @@ static int txgbe_swnodes_register(struct txgbe *txgbe)
return software_node_register_node_group(nodes->group);
}

+static int txgbe_clock_register(struct txgbe *txgbe)
+{
+ struct pci_dev *pdev = txgbe->wx->pdev;
+ struct clk_lookup *clock;
+ char clk_name[32];
+ struct clk *clk;
+
+ snprintf(clk_name, sizeof(clk_name), "i2c_designware.%d",
+ (pdev->bus->number << 8) | pdev->devfn);
+
+ clk = clk_register_fixed_rate(NULL, clk_name, NULL, 0, 156250000);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ clock = clkdev_create(clk, NULL, clk_name);
+ if (!clock) {
+ clk_unregister(clk);
+ return -ENOMEM;
+ }
+
+ txgbe->clk = clk;
+ txgbe->clock = clock;
+
+ return 0;
+}
+
int txgbe_init_phy(struct txgbe *txgbe)
{
int ret;
@@ -80,10 +108,23 @@ int txgbe_init_phy(struct txgbe *txgbe)
return ret;
}

+ ret = txgbe_clock_register(txgbe);
+ if (ret) {
+ wx_err(txgbe->wx, "failed to register clock: %d\n", ret);
+ goto err_unregister_swnode;
+ }
+
return 0;
+
+err_unregister_swnode:
+ software_node_unregister_node_group(txgbe->nodes.group);
+
+ return ret;
}

void txgbe_remove_phy(struct txgbe *txgbe)
{
+ clkdev_drop(txgbe->clock);
+ clk_unregister(txgbe->clk);
software_node_unregister_node_group(txgbe->nodes.group);
}
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
index 5bef0f9df523..cdbc4b37f832 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_type.h
@@ -146,6 +146,8 @@ struct txgbe_nodes {
struct txgbe {
struct wx *wx;
struct txgbe_nodes nodes;
+ struct clk_lookup *clock;
+ struct clk *clk;
};

#endif /* _TXGBE_TYPE_H_ */
--
2.27.0