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Message-ID: <20220117070706.17853-4-biao.huang@mediatek.com>
Date: Mon, 17 Jan 2022 15:07:02 +0800
From: Biao Huang <biao.huang@...iatek.com>
To: <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
<angelogioacchino.delregno@...labora.com>
CC: Matthias Brugger <matthias.bgg@...il.com>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Biao Huang <biao.huang@...iatek.com>, <netdev@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
<linux-stm32@...md-mailman.stormreply.com>,
<srv_heupstream@...iatek.com>, <macpaul.lin@...iatek.com>,
<dkirjanov@...e.de>
Subject: [PATCH net-next v12 3/7] stmmac: dwmac-mediatek: re-arrange clock setting
The rmii_internal clock is needed only when PHY
interface is RMII, and reference clock is from MAC.
Re-arrange the clock setting as following:
1. the optional "rmii_internal" is controlled by devm_clk_get(),
2. other clocks still be configured by devm_clk_bulk_get().
Signed-off-by: Biao Huang <biao.huang@...iatek.com>
---
.../ethernet/stmicro/stmmac/dwmac-mediatek.c | 72 +++++++++++++------
1 file changed, 49 insertions(+), 23 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
index 8747aa4403e8..2678d2deb26a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
@@ -49,14 +49,15 @@ struct mac_delay_struct {
struct mediatek_dwmac_plat_data {
const struct mediatek_dwmac_variant *variant;
struct mac_delay_struct mac_delay;
+ struct clk *rmii_internal_clk;
struct clk_bulk_data *clks;
- struct device_node *np;
struct regmap *peri_regmap;
+ struct device_node *np;
struct device *dev;
phy_interface_t phy_mode;
- int num_clks_to_config;
bool rmii_clk_from_mac;
bool rmii_rxc;
+ int num_clks;
};
struct mediatek_dwmac_variant {
@@ -74,7 +75,7 @@ struct mediatek_dwmac_variant {
/* list of clocks required for mac */
static const char * const mt2712_dwmac_clk_l[] = {
- "axi", "apb", "mac_main", "ptp_ref", "rmii_internal"
+ "axi", "apb", "mac_main", "ptp_ref"
};
static int mt2712_set_interface(struct mediatek_dwmac_plat_data *plat)
@@ -83,23 +84,12 @@ static int mt2712_set_interface(struct mediatek_dwmac_plat_data *plat)
int rmii_rxc = plat->rmii_rxc ? RMII_CLK_SRC_RXC : 0;
u32 intf_val = 0;
- /* The clock labeled as "rmii_internal" in mt2712_dwmac_clk_l is needed
- * only in RMII(when MAC provides the reference clock), and useless for
- * RGMII/MII/RMII(when PHY provides the reference clock).
- * num_clks_to_config indicates the real number of clocks should be
- * configured, equals to (plat->variant->num_clks - 1) in default for all the case,
- * then +1 for rmii_clk_from_mac case.
- */
- plat->num_clks_to_config = plat->variant->num_clks - 1;
-
/* select phy interface in top control domain */
switch (plat->phy_mode) {
case PHY_INTERFACE_MODE_MII:
intf_val |= PHY_INTF_MII;
break;
case PHY_INTERFACE_MODE_RMII:
- if (plat->rmii_clk_from_mac)
- plat->num_clks_to_config++;
intf_val |= (PHY_INTF_RMII | rmii_rxc | rmii_clk_from_mac);
break;
case PHY_INTERFACE_MODE_RGMII:
@@ -314,18 +304,36 @@ static int mediatek_dwmac_config_dt(struct mediatek_dwmac_plat_data *plat)
static int mediatek_dwmac_clk_init(struct mediatek_dwmac_plat_data *plat)
{
const struct mediatek_dwmac_variant *variant = plat->variant;
- int i, num = variant->num_clks;
+ int i, ret;
+
+ plat->num_clks = variant->num_clks;
- plat->clks = devm_kcalloc(plat->dev, num, sizeof(*plat->clks), GFP_KERNEL);
+ plat->clks = devm_kcalloc(plat->dev, plat->num_clks, sizeof(*plat->clks), GFP_KERNEL);
if (!plat->clks)
return -ENOMEM;
- for (i = 0; i < num; i++)
+ for (i = 0; i < plat->num_clks; i++)
plat->clks[i].id = variant->clk_list[i];
- plat->num_clks_to_config = variant->num_clks;
+ ret = devm_clk_bulk_get(plat->dev, plat->num_clks, plat->clks);
+ if (ret)
+ return ret;
+
+ /* The clock labeled as "rmii_internal" is needed only in RMII(when
+ * MAC provides the reference clock), and useless for RGMII/MII or
+ * RMII(when PHY provides the reference clock).
+ * So, "rmii_internal" clock is got and configured only when
+ * reference clock of RMII is from MAC.
+ */
+ if (plat->rmii_clk_from_mac) {
+ plat->rmii_internal_clk = devm_clk_get(plat->dev, "rmii_internal");
+ if (IS_ERR(plat->rmii_internal_clk))
+ ret = PTR_ERR(plat->rmii_internal_clk);
+ } else {
+ plat->rmii_internal_clk = NULL;
+ }
- return devm_clk_bulk_get(plat->dev, num, plat->clks);
+ return ret;
}
static int mediatek_dwmac_init(struct platform_device *pdev, void *priv)
@@ -350,20 +358,31 @@ static int mediatek_dwmac_init(struct platform_device *pdev, void *priv)
}
}
- ret = clk_bulk_prepare_enable(plat->num_clks_to_config, plat->clks);
+ ret = clk_bulk_prepare_enable(plat->num_clks, plat->clks);
if (ret) {
dev_err(plat->dev, "failed to enable clks, err = %d\n", ret);
return ret;
}
+ ret = clk_prepare_enable(plat->rmii_internal_clk);
+ if (ret) {
+ dev_err(plat->dev, "failed to enable rmii internal clk, err = %d\n", ret);
+ goto err_clk;
+ }
+
return 0;
+
+err_clk:
+ clk_bulk_disable_unprepare(plat->num_clks, plat->clks);
+ return ret;
}
static void mediatek_dwmac_exit(struct platform_device *pdev, void *priv)
{
struct mediatek_dwmac_plat_data *plat = priv;
- clk_bulk_disable_unprepare(plat->num_clks_to_config, plat->clks);
+ clk_disable_unprepare(plat->rmii_internal_clk);
+ clk_bulk_disable_unprepare(plat->num_clks, plat->clks);
}
static int mediatek_dwmac_clks_config(void *priv, bool enabled)
@@ -372,13 +391,20 @@ static int mediatek_dwmac_clks_config(void *priv, bool enabled)
int ret = 0;
if (enabled) {
- ret = clk_bulk_prepare_enable(plat->num_clks_to_config, plat->clks);
+ ret = clk_bulk_prepare_enable(plat->num_clks, plat->clks);
if (ret) {
dev_err(plat->dev, "failed to enable clks, err = %d\n", ret);
return ret;
}
+
+ ret = clk_prepare_enable(plat->rmii_internal_clk);
+ if (ret) {
+ dev_err(plat->dev, "failed to enable rmii internal clk, err = %d\n", ret);
+ return ret;
+ }
} else {
- clk_bulk_disable_unprepare(plat->num_clks_to_config, plat->clks);
+ clk_disable_unprepare(plat->rmii_internal_clk);
+ clk_bulk_disable_unprepare(plat->num_clks, plat->clks);
}
return ret;
--
2.25.1
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