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Miller" , Aleksander Jan Bajkowski , Andrew Lunn , Conor Dooley , Eric Dumazet , Florian Fainelli , Heiner Kallweit , Ivan Galkin , Jakub Kicinski , Krzysztof Kozlowski , Michael Klein , Paolo Abeni , Rob Herring , Russell King , Vladimir Oltean , devicetree@vger.kernel.org Subject: [net-next,PATCH v2 3/3] net: phy: realtek: Add property to enable SSC Date: Wed, 3 Dec 2025 22:08:06 +0100 Message-ID: <20251203210857.113328-3-marek.vasut@mailbox.org> In-Reply-To: <20251203210857.113328-1-marek.vasut@mailbox.org> References: <20251203210857.113328-1-marek.vasut@mailbox.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-MBO-RS-ID: d82f0e1cebd25e7e4fb X-MBO-RS-META: qp9c1ydh4sh7err115rzwtak1m4nq56w X-Rspamd-Queue-Id: 4dM9HX4f3Gz9tKq Add support for spread spectrum clocking (SSC) on RTL8211F(D)(I)-CG, RTL8211FS(I)(-VS)-CG, RTL8211FG(I)(-VS)-CG PHYs. The implementation follows EMI improvement application note Rev. 1.2 for these PHYs. The current implementation enables SSC for both RXC and SYSCLK clock signals. Introduce DT properties 'realtek,clkout-ssc-enable', 'realtek,rxc-ssc-enable' and 'realtek,sysclk-ssc-enable' which control CLKOUT, RXC and SYSCLK SSC spread spectrum clocking enablement on these signals. Signed-off-by: Marek Vasut --- Cc: "David S. Miller" Cc: Aleksander Jan Bajkowski Cc: Andrew Lunn Cc: Conor Dooley Cc: Eric Dumazet Cc: Florian Fainelli Cc: Heiner Kallweit Cc: Ivan Galkin Cc: Jakub Kicinski Cc: Krzysztof Kozlowski Cc: Michael Klein Cc: Paolo Abeni Cc: Rob Herring Cc: Russell King Cc: Vladimir Oltean Cc: devicetree@vger.kernel.org Cc: netdev@vger.kernel.org --- V2: Split SSC clock control for each CLKOUT, RXC, SYSCLK signal --- drivers/net/phy/realtek/realtek_main.c | 124 +++++++++++++++++++++++++ 1 file changed, 124 insertions(+) diff --git a/drivers/net/phy/realtek/realtek_main.c b/drivers/net/phy/realtek/realtek_main.c index 67ecf3d4af2b1..ac80653cdbe28 100644 --- a/drivers/net/phy/realtek/realtek_main.c +++ b/drivers/net/phy/realtek/realtek_main.c @@ -74,11 +74,19 @@ #define RTL8211F_PHYCR2 0x19 #define RTL8211F_CLKOUT_EN BIT(0) +#define RTL8211F_SYSCLK_SSC_EN BIT(3) #define RTL8211F_PHYCR2_PHY_EEE_ENABLE BIT(5) +#define RTL8211F_CLKOUT_SSC_EN BIT(7) #define RTL8211F_INSR_PAGE 0xa43 #define RTL8211F_INSR 0x1d +/* RTL8211F SSC settings */ +#define RTL8211F_SSC_PAGE 0xc44 +#define RTL8211F_SSC_RXC 0x13 +#define RTL8211F_SSC_SYSCLK 0x17 +#define RTL8211F_SSC_CLKOUT 0x19 + /* RTL8211F LED configuration */ #define RTL8211F_LEDCR_PAGE 0xd04 #define RTL8211F_LEDCR 0x10 @@ -203,6 +211,9 @@ MODULE_LICENSE("GPL"); struct rtl821x_priv { bool enable_aldps; bool disable_clk_out; + bool enable_clkout_ssc; + bool enable_rxc_ssc; + bool enable_sysclk_ssc; struct clk *clk; /* rtl8211f */ u16 iner; @@ -266,6 +277,12 @@ static int rtl821x_probe(struct phy_device *phydev) "realtek,aldps-enable"); priv->disable_clk_out = of_property_read_bool(dev->of_node, "realtek,clkout-disable"); + priv->enable_clkout_ssc = of_property_read_bool(dev->of_node, + "realtek,clkout-ssc-enable"); + priv->enable_rxc_ssc = of_property_read_bool(dev->of_node, + "realtek,rxc-ssc-enable"); + priv->enable_sysclk_ssc = of_property_read_bool(dev->of_node, + "realtek,sysclk-ssc-enable"); phydev->priv = priv; @@ -700,6 +717,101 @@ static int rtl8211f_config_phy_eee(struct phy_device *phydev) RTL8211F_PHYCR2_PHY_EEE_ENABLE, 0); } +static int rtl8211f_config_clkout_ssc(struct phy_device *phydev) +{ + struct rtl821x_priv *priv = phydev->priv; + struct device *dev = &phydev->mdio.dev; + int ret; + + /* The value is preserved if the device tree property is absent */ + if (!priv->enable_clkout_ssc) + return 0; + + /* RTL8211FVD has no PHYCR2 register */ + if (phydev->drv->phy_id == RTL_8211FVD_PHYID) + return 0; + + /* Unnamed registers from EMI improvement parameters application note 1.2 */ + ret = phy_write_paged(phydev, 0xd09, 0x10, 0xcf00); + if (ret < 0) { + dev_err(dev, "CLKOUT SCC initialization failed: %pe\n", ERR_PTR(ret)); + return ret; + } + + ret = phy_write_paged(phydev, RTL8211F_SSC_PAGE, RTL8211F_SSC_CLKOUT, 0x38c3); + if (ret < 0) { + dev_err(dev, "CLKOUT SCC configuration failed: %pe\n", ERR_PTR(ret)); + return ret; + } + + /* + * Enable CLKOUT SSC using PHYCR2 bit 7 , this step is missing from the + * EMI improvement parameters application note 1.2 section 2.3 + */ + ret = phy_modify_paged(phydev, RTL8211F_PHYCR_PAGE, RTL8211F_PHYCR2, + RTL8211F_CLKOUT_SSC_EN, RTL8211F_CLKOUT_SSC_EN); + if (ret < 0) { + dev_err(dev, "CLKOUT SCC enable failed: %pe\n", ERR_PTR(ret)); + return ret; + } + + return 0; +} + +static int rtl8211f_config_rxc_ssc(struct phy_device *phydev) +{ + struct rtl821x_priv *priv = phydev->priv; + struct device *dev = &phydev->mdio.dev; + int ret; + + /* The value is preserved if the device tree property is absent */ + if (!priv->enable_rxc_ssc) + return 0; + + /* RTL8211FVD has no PHYCR2 register */ + if (phydev->drv->phy_id == RTL_8211FVD_PHYID) + return 0; + + ret = phy_write_paged(phydev, RTL8211F_SSC_PAGE, RTL8211F_SSC_RXC, 0x5f00); + if (ret < 0) { + dev_err(dev, "RXC SCC configuration failed: %pe\n", ERR_PTR(ret)); + return ret; + } + + return 0; +} + +static int rtl8211f_config_sysclk_ssc(struct phy_device *phydev) +{ + struct rtl821x_priv *priv = phydev->priv; + struct device *dev = &phydev->mdio.dev; + int ret; + + /* The value is preserved if the device tree property is absent */ + if (!priv->enable_sysclk_ssc) + return 0; + + /* RTL8211FVD has no PHYCR2 register */ + if (phydev->drv->phy_id == RTL_8211FVD_PHYID) + return 0; + + ret = phy_write_paged(phydev, RTL8211F_SSC_PAGE, RTL8211F_SSC_SYSCLK, 0x4f00); + if (ret < 0) { + dev_err(dev, "SYSCLK SCC configuration failed: %pe\n", ERR_PTR(ret)); + return ret; + } + + /* Enable SSC */ + ret = phy_modify_paged(phydev, RTL8211F_PHYCR_PAGE, RTL8211F_PHYCR2, + RTL8211F_SYSCLK_SSC_EN, RTL8211F_SYSCLK_SSC_EN); + if (ret < 0) { + dev_err(dev, "SYSCLK SCC enable failed: %pe\n", ERR_PTR(ret)); + return ret; + } + + return 0; +} + static int rtl8211f_config_init(struct phy_device *phydev) { struct device *dev = &phydev->mdio.dev; @@ -723,6 +835,18 @@ static int rtl8211f_config_init(struct phy_device *phydev) return ret; } + ret = rtl8211f_config_clkout_ssc(phydev); + if (ret) + return ret; + + ret = rtl8211f_config_rxc_ssc(phydev); + if (ret) + return ret; + + ret = rtl8211f_config_sysclk_ssc(phydev); + if (ret) + return ret; + return rtl8211f_config_phy_eee(phydev); } -- 2.51.0