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authorPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>2017-07-14 19:57:39 +0200
committerPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>2017-08-13 17:12:32 +0200
commitdf0ae00041c62709917ad600999fd2945dc69426 (patch)
tree301ec5018cb5038ec4f7a07ef9d2a490900a75bd /drivers
parent629246907312390bbc281e531b60ac981842670f (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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/clk/rockchip/clk_rk3368.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/clk/rockchip/clk_rk3368.c b/drivers/clk/rockchip/clk_rk3368.c
index 1bed4e20bf0..2b6c8dabf8f 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;
}