linux-kernel - Re: [PATCH AUTOSEL 4.18 31/39] clk: sunxi-ng: sun50i: h6: Add 2x fixed post-divider to MMC module clocks

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Date:   Tue, 13 Nov 2018 20:27:50 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Sasha Levin <sashal@...nel.org>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
CC:     Maxime Ripard <maxime.ripard@...tlin.com>,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.18 31/39] clk: sunxi-ng: sun50i: h6: Add 2x fixed post-divider to MMC module clocks



于 2018年11月13日 GMT+08:00 下午1:50:45, Sasha Levin <sashal@...nel.org> 写到:
>From: Icenowy Zheng <icenowy@...c.io>
>
>[ Upstream commit c2ff8383cc33c2d9c169e4daf1e37a434c3bb420 ]
>
>On the H6, the MMC module clocks are fixed in the new timing mode,
>i.e. they do not have a bit to select the mode. These clocks have
>a 2x divider somewhere between the clock and the MMC module.
>
>To be consistent with other SoCs supporting the new timing mode,
>we model the 2x divider as a fixed post-divider on the MMC module
>clocks.
>
>This patch adds the post-dividers to the MMC clocks, following the
>approach on A64.
>
>Fixes: 524353ea480b ("clk: sunxi-ng: add support for the Allwinner H6
>CCU")
>Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
>Signed-off-by: Sasha Levin <sashal@...nel.org>

Please don't select this, it needs some fixes in MMC driver.

>---
> drivers/clk/sunxi-ng/ccu-sun50i-h6.c | 43 +++++++++++++++-------------
> 1 file changed, 23 insertions(+), 20 deletions(-)
>
>diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-h6.c
>b/drivers/clk/sunxi-ng/ccu-sun50i-h6.c
>index bdbfe78fe133..3d60f7978506 100644
>--- a/drivers/clk/sunxi-ng/ccu-sun50i-h6.c
>+++ b/drivers/clk/sunxi-ng/ccu-sun50i-h6.c
>@@ -408,26 +408,29 @@ static SUNXI_CCU_GATE(bus_nand_clk, "bus-nand",
>"ahb3", 0x82c, BIT(0), 0);
> 
>static const char * const mmc_parents[] = { "osc24M", "pll-periph0-2x",
> 					    "pll-periph1-2x" };
>-static SUNXI_CCU_MP_WITH_MUX_GATE(mmc0_clk, "mmc0", mmc_parents,
>0x830,
>-					0, 4,	/* M */
>-					8, 2,	/* N */
>-					24, 3,	/* mux */
>-					BIT(31),/* gate */
>-					0);
>-
>-static SUNXI_CCU_MP_WITH_MUX_GATE(mmc1_clk, "mmc1", mmc_parents,
>0x834,
>-					0, 4,	/* M */
>-					8, 2,	/* N */
>-					24, 3,	/* mux */
>-					BIT(31),/* gate */
>-					0);
>-
>-static SUNXI_CCU_MP_WITH_MUX_GATE(mmc2_clk, "mmc2", mmc_parents,
>0x838,
>-					0, 4,	/* M */
>-					8, 2,	/* N */
>-					24, 3,	/* mux */
>-					BIT(31),/* gate */
>-					0);
>+static SUNXI_CCU_MP_WITH_MUX_GATE_POSTDIV(mmc0_clk, "mmc0",
>mmc_parents, 0x830,
>+					  0, 4,		/* M */
>+					  8, 2,		/* N */
>+					  24, 3,	/* mux */
>+					  BIT(31),	/* gate */
>+					  2,		/* post-div */
>+					  0);
>+
>+static SUNXI_CCU_MP_WITH_MUX_GATE_POSTDIV(mmc1_clk, "mmc1",
>mmc_parents, 0x834,
>+					  0, 4,		/* M */
>+					  8, 2,		/* N */
>+					  24, 3,	/* mux */
>+					  BIT(31),	/* gate */
>+					  2,		/* post-div */
>+					  0);
>+
>+static SUNXI_CCU_MP_WITH_MUX_GATE_POSTDIV(mmc2_clk, "mmc2",
>mmc_parents, 0x838,
>+					  0, 4,		/* M */
>+					  8, 2,		/* N */
>+					  24, 3,	/* mux */
>+					  BIT(31),	/* gate */
>+					  2,		/* post-div */
>+					  0);
> 
>static SUNXI_CCU_GATE(bus_mmc0_clk, "bus-mmc0", "ahb3", 0x84c, BIT(0),
>0);
>static SUNXI_CCU_GATE(bus_mmc1_clk, "bus-mmc1", "ahb3", 0x84c, BIT(1),
>0);