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rockchip: clk: rk3368: add support for GMAC (SLCK_MAC) clock

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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>
This commit is contained in:
Philipp Tomsich 2017-07-14 19:57:39 +02:00
parent 6292469073
commit df0ae00041
2 changed files with 20 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/include/asm/arch-rockchip/cru_rk3368.h
View File

@ -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),

19
drivers/clk/rockchip/clk_rk3368.c
View File

@ -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;
}