On 25/12/2023 08:44, Luo Jie wrote:
On the platform ipq5332, the related SoC uniphy GCC clocks need
to be enabled for making the MDIO slave devices accessible.
These UNIPHY clocks are from the SoC platform GCC clock provider,
which are enabled for the connected PHY devices working.
Signed-off-by: Luo Jie <quic_luoj@xxxxxxxxxxx>
---
drivers/net/mdio/mdio-ipq4019.c | 75 ++++++++++++++++++++++++++++-----
1 file changed, 64 insertions(+), 11 deletions(-)
diff --git a/drivers/net/mdio/mdio-ipq4019.c b/drivers/net/mdio/mdio-ipq4019.c
index 5273864fabb3..e24b0e688b10 100644
--- a/drivers/net/mdio/mdio-ipq4019.c
+++ b/drivers/net/mdio/mdio-ipq4019.c
@@ -35,15 +35,36 @@
/* MDIO clock source frequency is fixed to 100M */
#define IPQ_MDIO_CLK_RATE 100000000
+/* SoC UNIPHY fixed clock */
+#define IPQ_UNIPHY_AHB_CLK_RATE 100000000
+#define IPQ_UNIPHY_SYS_CLK_RATE 24000000
+
#define IPQ_PHY_SET_DELAY_US 100000
/* Maximum SOC PCS(uniphy) number on IPQ platform */
#define ETH_LDO_RDY_CNT 3
+enum mdio_clk_id {
+ MDIO_CLK_MDIO_AHB,
+ MDIO_CLK_UNIPHY0_AHB,
+ MDIO_CLK_UNIPHY0_SYS,
+ MDIO_CLK_UNIPHY1_AHB,
+ MDIO_CLK_UNIPHY1_SYS,
+ MDIO_CLK_CNT
+};
+
struct ipq4019_mdio_data {
void __iomem *membase;
void __iomem *eth_ldo_rdy[ETH_LDO_RDY_CNT];
- struct clk *mdio_clk;
+ struct clk *clk[MDIO_CLK_CNT];
+};
+
+static const char *const mdio_clk_name[] = {
+ "gcc_mdio_ahb_clk",
+ "uniphy0_ahb",
+ "uniphy0_sys",
+ "uniphy1_ahb",
+ "uniphy1_sys"
};
static int ipq4019_mdio_wait_busy(struct mii_bus *bus)
@@ -209,14 +230,43 @@ static int ipq4019_mdio_write_c22(struct mii_bus *bus, int mii_id, int regnum,
static int ipq_mdio_reset(struct mii_bus *bus)
{
struct ipq4019_mdio_data *priv = bus->priv;
- int ret;
+ unsigned long rate;
+ int ret, index;
- /* Configure MDIO clock source frequency if clock is specified in the device tree */
- ret = clk_set_rate(priv->mdio_clk, IPQ_MDIO_CLK_RATE);
- if (ret)
- return ret;
+ /* For the platform ipq5332, there are two SoC uniphies available
+ * for connecting with ethernet PHY, the SoC uniphy gcc clock
+ * should be enabled for resetting the connected device such
+ * as qca8386 switch, qca8081 PHY or other PHYs effectively.
+ *
+ * Configure MDIO/UNIPHY clock source frequency if clock instance
+ * is specified in the device tree.
+ */
+ for (index = MDIO_CLK_MDIO_AHB; index < MDIO_CLK_CNT; index++) {
you could do a
if (!priv->clk[index])
continue;
here and save a few cycles executing code for absent clocks. ipq6018 has
just 1/5 of the clocks you are checking for here.
Better still capture the number of clocks you find in probe() in a
variable priv->num_clocks and only step through the array
for (i = 0; i < priv->num_clocks; i++) {}
---
bod
