diff options
| author | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2017-07-14 19:57:39 +0200 |
|---|---|---|
| committer | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2017-08-13 17:12:32 +0200 |
| commit | df0ae00041c62709917ad600999fd2945dc69426 (patch) | |
| tree | 301ec5018cb5038ec4f7a07ef9d2a490900a75bd | |
| parent | 629246907312390bbc281e531b60ac981842670f (diff) | |
rockchip: clk: rk3368: add support for GMAC (SLCK_MAC) clock
To enable the GMAC on the RK3368, we need to set up the clocking
appropriately to generate a tx_clk for the MAC.
This adds an implementation that implements the use of the <&ext_gmac>
clock (i.e. an external 125MHz clock for RGMII provided by the PHY).
This is the clock setup used by the boards currently supported by
U-Boot (i.e. Geekbox, Sheep and RK3368-uQ7).
This includes the change from commit
- rockchip: clk: rk3368: define GMAC_MUX_SEL_EXTCLK
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | arch/arm/include/asm/arch-rockchip/cru_rk3368.h | 3 | ||||
| -rw-r--r-- | drivers/clk/rockchip/clk_rk3368.c | 19 |
2 files changed, 20 insertions, 2 deletions
diff --git a/arch/arm/include/asm/arch-rockchip/cru_rk3368.h b/arch/arm/include/asm/arch-rockchip/cru_rk3368.h index 21f11e017c..2b1197fd46 100644 --- a/arch/arm/include/asm/arch-rockchip/cru_rk3368.h +++ b/arch/arm/include/asm/arch-rockchip/cru_rk3368.h @@ -89,6 +89,9 @@ enum { MCU_CLK_DIV_SHIFT = 0, MCU_CLK_DIV_MASK = GENMASK(4, 0), + /* CLKSEL43_CON */ + GMAC_MUX_SEL_EXTCLK = BIT(8), + /* CLKSEL51_CON */ MMC_PLL_SEL_SHIFT = 8, MMC_PLL_SEL_MASK = GENMASK(9, 8), diff --git a/drivers/clk/rockchip/clk_rk3368.c b/drivers/clk/rockchip/clk_rk3368.c index 1bed4e20bf..2b6c8dabf8 100644 --- a/drivers/clk/rockchip/clk_rk3368.c +++ b/drivers/clk/rockchip/clk_rk3368.c @@ -338,6 +338,19 @@ static ulong rk3368_ddr_set_clk(struct rk3368_cru *cru, ulong set_rate) } #endif +#if CONFIG_IS_ENABLED(GMAC_ROCKCHIP) +static ulong rk3368_gmac_set_clk(struct rk3368_cru *cru, + ulong clk_id, ulong set_rate) +{ + /* + * This models the 'assigned-clock-parents = <&ext_gmac>' from + * the DTS and switches to the 'ext_gmac' clock parent. + */ + rk_setreg(&cru->clksel_con[43], GMAC_MUX_SEL_EXTCLK); + return set_rate; +} +#endif + static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate) { struct rk3368_clk_priv *priv = dev_get_priv(clk->dev); @@ -356,10 +369,12 @@ static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate) ret = rk3368_mmc_set_clk(clk, rate); break; #endif +#if CONFIG_IS_ENABLED(GMAC_ROCKCHIP) case SCLK_MAC: - /* nothing to do, as this is an external clock */ - ret = rate; + /* select the external clock */ + ret = rk3368_gmac_set_clk(priv->cru, clk->id, rate); break; +#endif default: return -ENOENT; } |