[RFC PATCH 08/13] dwmac-meson8b: add support for phy selection
From: Neil Armstrong <hidden>
Date: 2016-10-21 14:43:24
Also in:
linux-amlogic, linux-arm-kernel, linux-devicetree, linux-gpio, lkml
Subsystem:
networking drivers, stmmac ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
The Meson GXL dwmac Glue Layer also provides switching between an external PHY and an internal RMII 10/100 PHY. Add a way to setup the correct PHY switching from a device tree attribute. Currently, the register format is unknown and this is a temporary workaround until a clarification on the registers fields is received from Amlogic. Signed-off-by: Neil Armstrong <redacted> --- .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
index 250e4ce..875cd7c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c@@ -53,10 +53,15 @@ #define MUX_CLK_NUM_PARENTS 2 +#define PHYSEL_REG0 0x0 +#define PHYSEL_REG0_VALUE 0x10110181 +#define PHYSEL_REG1 0x4 + struct meson8b_dwmac { struct platform_device *pdev; void __iomem *regs; + void __iomem *physel_regs; phy_interface_t phy_mode;
@@ -244,6 +249,23 @@ static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac) meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK, PRG_ETH0_TX_AND_PHY_REF_CLK); + /* Select PHY, either internal or external if specified */ + if (!IS_ERR(dwmac->physel_regs) && + of_find_property(dwmac->pdev->dev.of_node, + "amlogic,phy-select", NULL)) { + u32 val; + + ret = of_property_read_u32(dwmac->pdev->dev.of_node, + "amlogic,phy-select", &val); + if (ret) { + dev_err(&dwmac->pdev->dev, "invalid phy-select property\n"); + } else { + writel(PHYSEL_REG0_VALUE, + dwmac->physel_regs + PHYSEL_REG0); + writel(val, dwmac->physel_regs + PHYSEL_REG1); + } + } + return 0; }
@@ -272,6 +294,9 @@ static int meson8b_dwmac_probe(struct platform_device *pdev) if (IS_ERR(dwmac->regs)) return PTR_ERR(dwmac->regs); + res = platform_get_resource(pdev, IORESOURCE_MEM, 2); + dwmac->physel_regs = devm_ioremap_resource(&pdev->dev, res); + dwmac->pdev = pdev; dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node); if (dwmac->phy_mode < 0) {
--
1.9.1