linux-kernel - Re: [PATCH] clk: rockchip: add flag CLK_SET_RATE_PARENT for dclk_vop0

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Message-ID: <2376423.L1zs1HaIGm@diego>
Date:	Tue, 14 Jun 2016 00:46:34 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Xing Zheng <zhengxing@...k-chips.com>
Cc:	dianders@...omium.org, elaine.zhang@...k-chips.com,
	huangtao@...k-chips.com, briannorris@...omium.org,
	ykk@...k-chips.com, Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: rockchip: add flag CLK_SET_RATE_PARENT for dclk_vop0_div on RK3399

Am Sonntag, 12. Juni 2016, 17:48:48 schrieb Xing Zheng:
> The functions and features VOP0 more complete than VOP1's, we need to
> use it dclk_vop0_div operate VPLLI, and let VOP0 as the default primary
> screen.
> 
> Signed-off-by: Xing Zheng <zhengxing@...k-chips.com>
> ---
> 
>  drivers/clk/rockchip/clk-rk3399.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/rockchip/clk-rk3399.c
> b/drivers/clk/rockchip/clk-rk3399.c index 7ecb12c3..6affa75 100644
> --- a/drivers/clk/rockchip/clk-rk3399.c
> +++ b/drivers/clk/rockchip/clk-rk3399.c
> @@ -1157,7 +1157,7 @@ static struct rockchip_clk_branch
> rk3399_clk_branches[] __initdata = { GATE(HCLK_VOP0_NOC, "hclk_vop0_noc",
> "hclk_vop0_pre", CLK_IGNORE_UNUSED, RK3399_CLKGATE_CON(28), 0, GFLAGS),
> 
> -	COMPOSITE(DCLK_VOP0_DIV, "dclk_vop0_div", mux_pll_src_vpll_cpll_gpll_p, 0,
> +	COMPOSITE(DCLK_VOP0_DIV, "dclk_vop0_div", mux_pll_src_vpll_cpll_gpll_p,
> CLK_SET_RATE_PARENT, RK3399_CLKSEL_CON(49), 8, 2, MFLAGS, 0, 8, DFLAGS,
>  			RK3399_CLKGATE_CON(10), 12, GFLAGS),

The vpll is a possible source for multiple clocks (cci, aclk_vop0, dclk_vop0, 
clk_vop0_pwm, aclk_vop1, dclk_vop1, clk_vop1_pwm), so allowing one clock to 
hog the rate setting, might influence the other consumers of the vpll as well.