diff options
Diffstat (limited to 'drivers/clk/sunxi-ng/ccu-sun8i-r40.c')
-rw-r--r-- | drivers/clk/sunxi-ng/ccu-sun8i-r40.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-r40.c b/drivers/clk/sunxi-ng/ccu-sun8i-r40.c index c3aa839a453d..65ba6455feb7 100644 --- a/drivers/clk/sunxi-ng/ccu-sun8i-r40.c +++ b/drivers/clk/sunxi-ng/ccu-sun8i-r40.c @@ -1251,9 +1251,37 @@ static struct ccu_mux_nb sun8i_r40_cpu_nb = { .bypass_index = 1, /* index of 24 MHz oscillator */ }; +/* + * Add a regmap for the GMAC driver (dwmac-sun8i) to access the + * GMAC configuration register. + * Only this register is allowed to be written, in order to + * prevent overriding critical clock configuration. + */ + +#define SUN8I_R40_GMAC_CFG_REG 0x164 +static bool sun8i_r40_ccu_regmap_accessible_reg(struct device *dev, + unsigned int reg) +{ + if (reg == SUN8I_R40_GMAC_CFG_REG) + return true; + return false; +} + +static struct regmap_config sun8i_r40_ccu_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = 0x320, /* PLL_LOCK_CTRL_REG */ + + /* other devices have no business accessing other registers */ + .readable_reg = sun8i_r40_ccu_regmap_accessible_reg, + .writeable_reg = sun8i_r40_ccu_regmap_accessible_reg, +}; + static int sun8i_r40_ccu_probe(struct platform_device *pdev) { struct resource *res; + struct regmap *regmap; void __iomem *reg; u32 val; int ret; @@ -1278,6 +1306,11 @@ static int sun8i_r40_ccu_probe(struct platform_device *pdev) val &= ~GENMASK(25, 20); writel(val, reg + SUN8I_R40_USB_CLK_REG); + regmap = devm_regmap_init_mmio(&pdev->dev, reg, + &sun8i_r40_ccu_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + ret = sunxi_ccu_probe(pdev->dev.of_node, reg, &sun8i_r40_ccu_desc); if (ret) return ret; |