linux-kernel - [PATCH v2] clk: rockchip: rk3288: i2s_frac adds flag to set parent's rate

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Date:	Mon, 13 Oct 2014 08:44:16 +0800
From:	Jianqun <jay.xu@...k-chips.com>
To:	mturquette@...aro.org, dianders@...omium.org, heiko@...ech.de,
	jay.xu@...k-chips.com, kever.yang@...k-chips.com,
	dbasehore@...omium.org, mark.yao@...k-chips.com
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	huangtao@...k-chips.com, cf@...k-chips.com
Subject: [PATCH v2] clk: rockchip: rk3288: i2s_frac adds flag to set parent's rate

The relation of i2s nodes as follows:
          i2s_src               1           1            594000000  0
             i2s_frac           1           1            11289600   0
                i2s_pre         1           1            11289600   0
                   sclk_i2s0    1           1            11289600   0
                   i2s0_clkout  0           0            11289600   0
                      hclk_i2s0 1           1            148500000  0

"sclk_i2s0" is the master clock, should allow to set its parent's rate.
Add flag CLK_SET_RATE_PARENT for "i2s_frac", "i2s_pre" and "sclk_i2s0".

Tested on rk3288 board using max98090, with command "aplay <music.wav>"
and cat /sys/kernel/debug/clk/clk_summary |grep i2s

Signed-off-by: Jianqun <jay.xu@...k-chips.com>
---
change since v1:
- no "Change-Id"s in upstream patches, suggested by Heiko
- to limit i2s0_clkout to select between its two parent without being able
  influence the core i2s clock, suggested by Heiko

 drivers/clk/rockchip/clk-rk3288.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/rockchip/clk-rk3288.c b/drivers/clk/rockchip/clk-rk3288.c
index b22a2d2..ae32d78 100644
--- a/drivers/clk/rockchip/clk-rk3288.c
+++ b/drivers/clk/rockchip/clk-rk3288.c
@@ -238,15 +238,15 @@ static struct rockchip_clk_branch rk3288_clk_branches[] __initdata = {
 	COMPOSITE(0, "i2s_src", mux_pll_src_cpll_gpll_p, 0,
 			RK3288_CLKSEL_CON(4), 15, 1, MFLAGS, 0, 7, DFLAGS,
 			RK3288_CLKGATE_CON(4), 1, GFLAGS),
-	COMPOSITE_FRAC(0, "i2s_frac", "i2s_src", 0,
+	COMPOSITE_FRAC(0, "i2s_frac", "i2s_src", CLK_SET_RATE_PARENT,
 			RK3288_CLKSEL_CON(8), 0,
 			RK3288_CLKGATE_CON(4), 2, GFLAGS),
-	MUX(0, "i2s_pre", mux_i2s_pre_p, 0,
+	MUX(0, "i2s_pre", mux_i2s_pre_p, CLK_SET_RATE_PARENT,
 			RK3288_CLKSEL_CON(4), 8, 2, MFLAGS),
 	COMPOSITE_NODIV(0, "i2s0_clkout", mux_i2s_clkout_p, 0,
 			RK3288_CLKSEL_CON(4), 12, 1, MFLAGS,
 			RK3288_CLKGATE_CON(4), 0, GFLAGS),
-	GATE(SCLK_I2S0, "sclk_i2s0", "i2s_pre", 0,
+	GATE(SCLK_I2S0, "sclk_i2s0", "i2s_pre", CLK_SET_RATE_PARENT,
 			RK3288_CLKGATE_CON(4), 3, GFLAGS),
 
 	MUX(0, "spdif_src", mux_pll_src_cpll_gpll_p, 0,
-- 
1.9.1


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