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[net-next,v6,3/8] net: stmmac: dwmac-stm32: Separate out external clock selector

Message ID 20240610071459.287500-4-christophe.roullier@foss.st.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series Series to deliver Ethernet for STM32MP13 | expand

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Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 864 this patch: 864
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 9 of 9 maintainers
netdev/build_clang success Errors and warnings before: 868 this patch: 868
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 868 this patch: 868
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 82 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-06-10--15-00 (tests: 644)

Commit Message

Christophe Roullier June 10, 2024, 7:14 a.m. UTC 
From: Marek Vasut <marex@denx.de>

Pull the external clock selector into a separate function, to avoid
conflating it with external clock rate validation and clock mux
register configuration. This should make the code easier to read and
understand.

The dwmac->enable_eth_ck variable in the end indicates whether the MAC
clock are supplied by external oscillator (true) or internal RCC clock
IP (false). The dwmac->enable_eth_ck value is set based on multiple DT
properties, some of them deprecated, some of them specific to bus mode.

The following DT properties and variables are taken into account. In
each case, if the property is present or true, MAC clock is supplied
by external oscillator.
- "st,ext-phyclk", assigned to variable dwmac->ext_phyclk
  - Used in any mode (MII/RMII/GMII/RGMII)
  - The only non-deprecated DT property of the three
- "st,eth-clk-sel", assigned to variable dwmac->eth_clk_sel_reg
  - Valid only in GMII/RGMII mode
  - Deprecated property, backward compatibility only
- "st,eth-ref-clk-sel", assigned to variable dwmac->eth_ref_clk_sel_reg
  - Valid only in RMII mode
  - Deprecated property, backward compatibility only

The stm32mp1_select_ethck_external() function handles the aforementioned
DT properties and sets dwmac->enable_eth_ck accordingly.

The stm32mp1_set_mode() is adjusted to call stm32mp1_select_ethck_external()
first and then only use dwmac->enable_eth_ck to determine hardware clock mux
settings.

No functional change intended.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Christophe Roullier <christophe.roullier@foss.st.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 50 ++++++++++++++-----
 1 file changed, 38 insertions(+), 12 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index 2fd2620ebed69..767994061ea82 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -157,6 +157,37 @@  static int stm32_dwmac_init(struct plat_stmmacenet_data *plat_dat, bool resume)
 	return stm32_dwmac_clk_enable(dwmac, resume);
 }
 
+static int stm32mp1_select_ethck_external(struct plat_stmmacenet_data *plat_dat)
+{
+	struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
+
+	switch (plat_dat->mac_interface) {
+	case PHY_INTERFACE_MODE_MII:
+		dwmac->enable_eth_ck = dwmac->ext_phyclk;
+		return 0;
+	case PHY_INTERFACE_MODE_GMII:
+		dwmac->enable_eth_ck = dwmac->eth_clk_sel_reg ||
+				       dwmac->ext_phyclk;
+		return 0;
+	case PHY_INTERFACE_MODE_RMII:
+		dwmac->enable_eth_ck = dwmac->eth_ref_clk_sel_reg ||
+				       dwmac->ext_phyclk;
+		return 0;
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		dwmac->enable_eth_ck = dwmac->eth_clk_sel_reg ||
+				       dwmac->ext_phyclk;
+		return 0;
+	default:
+		dwmac->enable_eth_ck = false;
+		dev_err(dwmac->dev, "Mode %s not supported",
+			phy_modes(plat_dat->mac_interface));
+		return -EINVAL;
+	}
+}
+
 static int stm32mp1_validate_ethck_rate(struct plat_stmmacenet_data *plat_dat)
 {
 	struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
@@ -194,28 +225,25 @@  static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
 	u32 reg = dwmac->mode_reg;
 	int val, ret;
 
-	dwmac->enable_eth_ck = false;
+	ret = stm32mp1_select_ethck_external(plat_dat);
+	if (ret)
+		return ret;
+
 	switch (plat_dat->mac_interface) {
 	case PHY_INTERFACE_MODE_MII:
-		if (dwmac->ext_phyclk)
-			dwmac->enable_eth_ck = true;
 		val = SYSCFG_PMCR_ETH_SEL_MII;
 		pr_debug("SYSCFG init : PHY_INTERFACE_MODE_MII\n");
 		break;
 	case PHY_INTERFACE_MODE_GMII:
 		val = SYSCFG_PMCR_ETH_SEL_GMII;
-		if (dwmac->eth_clk_sel_reg || dwmac->ext_phyclk) {
-			dwmac->enable_eth_ck = true;
+		if (dwmac->enable_eth_ck)
 			val |= SYSCFG_PMCR_ETH_CLK_SEL;
-		}
 		pr_debug("SYSCFG init : PHY_INTERFACE_MODE_GMII\n");
 		break;
 	case PHY_INTERFACE_MODE_RMII:
 		val = SYSCFG_PMCR_ETH_SEL_RMII;
-		if (dwmac->eth_ref_clk_sel_reg || dwmac->ext_phyclk) {
-			dwmac->enable_eth_ck = true;
+		if (dwmac->enable_eth_ck)
 			val |= SYSCFG_PMCR_ETH_REF_CLK_SEL;
-		}
 		pr_debug("SYSCFG init : PHY_INTERFACE_MODE_RMII\n");
 		break;
 	case PHY_INTERFACE_MODE_RGMII:
@@ -223,10 +251,8 @@  static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
 	case PHY_INTERFACE_MODE_RGMII_RXID:
 	case PHY_INTERFACE_MODE_RGMII_TXID:
 		val = SYSCFG_PMCR_ETH_SEL_RGMII;
-		if (dwmac->eth_clk_sel_reg || dwmac->ext_phyclk) {
-			dwmac->enable_eth_ck = true;
+		if (dwmac->enable_eth_ck)
 			val |= SYSCFG_PMCR_ETH_CLK_SEL;
-		}
 		pr_debug("SYSCFG init : PHY_INTERFACE_MODE_RGMII\n");
 		break;
 	default: