From 434d5a00a4578f826e7e2cef29bf2388dd760a88 Mon Sep 17 00:00:00 2001 From: Philipp Tomsich Date: Fri, 23 Feb 2018 17:36:41 +0100 Subject: [PATCH] rockchip: clk: rk3399: handle set_rate/get_rate for PLL_PPLL The device-tree node for the PMU clk controller assigns to its parent (i.e. PLL_PPLL) even though this clock currently is set up statically by an init-function. In order to avoid unexpected failures, a simple implementation of set_rate (which accepts requests, but notifies the caller of the preset frequency in its return value) and get_rate (which always returns the preset frequency) are added. Note that this is required for the RK808 PMIC to probe successfully on the RK3399-Q7, following the support for the assigned-clocks property. References: commit f4fcba5c5baa ("clk: implement clk_set_defaults()") Signed-off-by: Philipp Tomsich Tested-by: Klaus Goger --- drivers/clk/rockchip/clk_rk3399.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c index 8822d3a9a8..fb74c441ff 100644 --- a/drivers/clk/rockchip/clk_rk3399.c +++ b/drivers/clk/rockchip/clk_rk3399.c @@ -1246,6 +1246,8 @@ static ulong rk3399_pmuclk_get_rate(struct clk *clk) ulong rate = 0; switch (clk->id) { + case PLL_PPLL: + return PPLL_HZ; case PCLK_RKPWM_PMU: rate = rk3399_pwm_get_clk(priv->pmucru); break; @@ -1267,6 +1269,13 @@ static ulong rk3399_pmuclk_set_rate(struct clk *clk, ulong rate) ulong ret = 0; switch (clk->id) { + case PLL_PPLL: + /* + * This has already been set up and we don't want/need + * to change it here. Accept the request though, as the + * device-tree has this in an 'assigned-clocks' list. + */ + return PPLL_HZ; case SCLK_I2C0_PMU: case SCLK_I2C4_PMU: case SCLK_I2C8_PMU: -- 2.30.2