diff options
| -rw-r--r-- | drivers/clk/rockchip/clk_rk3399.c | 74 |
1 files changed, 72 insertions, 2 deletions
diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c index 2f4c4e343c..e791936dbb 100644 --- a/drivers/clk/rockchip/clk_rk3399.c +++ b/drivers/clk/rockchip/clk_rk3399.c @@ -742,6 +742,30 @@ static ulong rk3399_mmc_set_clk(struct rk3399_cru *cru, return rk3399_mmc_get_clk(cru, clk_id); } +static ulong rk3399_gmac_set_clk(struct rk3399_cru *cru, ulong rate) +{ + ulong ret; + + /* + * The RGMII CLK can be derived either from an external "clkin" + * or can be generated from internally by a divider from SCLK_MAC. + */ + if (readl(&cru->clksel_con[19]) & BIT(4)) { + /* An external clock will always generate the right rate... */ + ret = rate; + } else { + /* + * No platform uses an internal clock to date. + * Implement this once it becomes necessary and print an error + * if someone tries to use it (while it remains unimplemented). + */ + pr_err("%s: internal clock is UNIMPLEMENTED\n", __func__); + ret = 0; + } + + return ret; +} + #define PMUSGRF_DDR_RGN_CON16 0xff330040 static ulong rk3399_ddr_set_clk(struct rk3399_cru *cru, ulong set_rate) @@ -865,8 +889,7 @@ static ulong rk3399_clk_set_rate(struct clk *clk, ulong rate) ret = rk3399_mmc_set_clk(priv->cru, clk->id, rate); break; case SCLK_MAC: - /* nothing to do, as this is an external clock */ - ret = rate; + ret = rk3399_gmac_set_clk(priv->cru, rate); break; case SCLK_I2C1: case SCLK_I2C2: @@ -902,6 +925,52 @@ static ulong rk3399_clk_set_rate(struct clk *clk, ulong rate) return ret; } +static int rk3399_gmac_set_parent(struct clk *clk, struct clk *parent) +{ + struct rk3399_clk_priv *priv = dev_get_priv(clk->dev); + const char *clock_output_name; + int ret; + + /* + * If the requested parent is in the same clock-controller and + * the id is SCLK_MAC ("clk_gmac"), switch to the internal clock. + */ + if ((parent->dev == clk->dev) && (parent->id == SCLK_MAC)) { + debug("%s: switching RGMII to SCLK_MAC\n", __func__); + rk_clrreg(&priv->cru->clksel_con[19], BIT(4)); + return 0; + } + + /* + * Otherwise, we need to check the clock-output-names of the + * requested parent to see if the requested id is "clkin_gmac". + */ + ret = dev_read_string_index(parent->dev, "clock-output-names", + parent->id, &clock_output_name); + if (ret < 0) + return -ENODATA; + + /* If this is "clkin_gmac", switch to the external clock input */ + if (!strcmp(clock_output_name, "clkin_gmac")) { + debug("%s: switching RGMII to CLKIN\n", __func__); + rk_setreg(&priv->cru->clksel_con[19], BIT(4)); + return 0; + } + + return -EINVAL; +} + +static int rk3399_clk_set_parent(struct clk *clk, struct clk *parent) +{ + switch (clk->id) { + case SCLK_RMII_SRC: + return rk3399_gmac_set_parent(clk, parent); + } + + debug("%s: unsupported clk %ld\n", __func__, clk->id); + return -ENOENT; +} + static int rk3399_clk_enable(struct clk *clk) { switch (clk->id) { @@ -919,6 +988,7 @@ static int rk3399_clk_enable(struct clk *clk) static struct clk_ops rk3399_clk_ops = { .get_rate = rk3399_clk_get_rate, .set_rate = rk3399_clk_set_rate, + .set_parent = rk3399_clk_set_parent, .enable = rk3399_clk_enable, }; |