linux-kernel - Re: [PATCH v6 1/3] clk: imx7d: create clocks behind rawnand clock gate

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Date:   Fri, 9 Jun 2017 19:16:33 +0000
From:   Han Xu <han.xu@....com>
To:     Stefan Agner <stefan@...er.ch>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "sboyd@...eaurora.org" <sboyd@...eaurora.org>
CC:     "A.S. Dong" <aisheng.dong@....com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "boris.brezillon@...e-electrons.com" 
        <boris.brezillon@...e-electrons.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "richard@....at" <richard@....at>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "fabio.estevam@...escale.com" <fabio.estevam@...escale.com>,
        "LW@...O-electronics.de" <LW@...O-electronics.de>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/3] clk: imx7d: create clocks behind rawnand clock
 gate



On 06/08/2017 05:34 PM, Stefan Agner wrote:
> The rawnand clock gate gates two clocks, NAND_USDHC_BUS_CLK_ROOT
> and NAND_CLK_ROOT. However, the gate has been in the chain of the
> latter only. This does not allow to use the NAND_USDHC_BUS_CLK_ROOT
> only, e.g. as required by APBH-Bridge-DMA.
>
> Add new clocks which represent the clock after the gate, and use a
> shared clock gate to correctly model the hardware.
>
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> Tested-by: Fabio Estevam <fabio.estevam@....com>
Acked-by: Han Xu <han.xu@....com>
> ---
>   drivers/clk/imx/clk-imx7d.c             | 6 ++++--
>   include/dt-bindings/clock/imx7d-clock.h | 4 +++-
>   2 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/clk/imx/clk-imx7d.c b/drivers/clk/imx/clk-imx7d.c
> index 93b0364..e364060 100644
> --- a/drivers/clk/imx/clk-imx7d.c
> +++ b/drivers/clk/imx/clk-imx7d.c
> @@ -25,6 +25,7 @@
>   static u32 share_count_sai1;
>   static u32 share_count_sai2;
>   static u32 share_count_sai3;
> +static u32 share_count_nand;
>   
>   static struct clk_div_table test_div_table[] = {
>   	{ .val = 3, .div = 1, },
> @@ -748,7 +749,7 @@ static void __init imx7d_clocks_init(struct device_node *ccm_node)
>   	clks[IMX7D_ENET2_TIME_ROOT_DIV] = imx_clk_divider2("enet2_time_post_div", "enet2_time_pre_div", base + 0xa880, 0, 6);
>   	clks[IMX7D_ENET_PHY_REF_ROOT_DIV] = imx_clk_divider2("enet_phy_ref_post_div", "enet_phy_ref_pre_div", base + 0xa900, 0, 6);
>   	clks[IMX7D_EIM_ROOT_DIV] = imx_clk_divider2("eim_post_div", "eim_pre_div", base + 0xa980, 0, 6);
> -	clks[IMX7D_NAND_ROOT_DIV] = imx_clk_divider2("nand_post_div", "nand_pre_div", base + 0xaa00, 0, 6);
> +	clks[IMX7D_NAND_ROOT_CLK] = imx_clk_divider2("nand_root_clk", "nand_pre_div", base + 0xaa00, 0, 6);
>   	clks[IMX7D_QSPI_ROOT_DIV] = imx_clk_divider2("qspi_post_div", "qspi_pre_div", base + 0xaa80, 0, 6);
>   	clks[IMX7D_USDHC1_ROOT_DIV] = imx_clk_divider2("usdhc1_post_div", "usdhc1_pre_div", base + 0xab00, 0, 6);
>   	clks[IMX7D_USDHC2_ROOT_DIV] = imx_clk_divider2("usdhc2_post_div", "usdhc2_pre_div", base + 0xab80, 0, 6);
> @@ -825,7 +826,8 @@ static void __init imx7d_clocks_init(struct device_node *ccm_node)
>   	clks[IMX7D_ENET2_TIME_ROOT_CLK] = imx_clk_gate4("enet2_time_root_clk", "enet2_time_post_div", base + 0x4510, 0);
>   	clks[IMX7D_ENET_PHY_REF_ROOT_CLK] = imx_clk_gate4("enet_phy_ref_root_clk", "enet_phy_ref_post_div", base + 0x4520, 0);
>   	clks[IMX7D_EIM_ROOT_CLK] = imx_clk_gate4("eim_root_clk", "eim_post_div", base + 0x4160, 0);
> -	clks[IMX7D_NAND_ROOT_CLK] = imx_clk_gate4("nand_root_clk", "nand_post_div", base + 0x4140, 0);
> +	clks[IMX7D_NAND_RAWNAND_CLK] = imx_clk_gate2_shared2("nand_rawnand_clk", "nand_root_clk", base + 0x4140, 0, &share_count_nand);
> +	clks[IMX7D_NAND_USDHC_BUS_RAWNAND_CLK] = imx_clk_gate2_shared2("nand_usdhc_rawnand_clk", "nand_usdhc_root_clk", base + 0x4140, 0, &share_count_nand);
>   	clks[IMX7D_QSPI_ROOT_CLK] = imx_clk_gate4("qspi_root_clk", "qspi_post_div", base + 0x4150, 0);
>   	clks[IMX7D_USDHC1_ROOT_CLK] = imx_clk_gate4("usdhc1_root_clk", "usdhc1_post_div", base + 0x46c0, 0);
>   	clks[IMX7D_USDHC2_ROOT_CLK] = imx_clk_gate4("usdhc2_root_clk", "usdhc2_post_div", base + 0x46d0, 0);
> diff --git a/include/dt-bindings/clock/imx7d-clock.h b/include/dt-bindings/clock/imx7d-clock.h
> index a7a1a50..de62a83 100644
> --- a/include/dt-bindings/clock/imx7d-clock.h
> +++ b/include/dt-bindings/clock/imx7d-clock.h
> @@ -450,5 +450,7 @@
>   #define IMX7D_CLK_ARM			437
>   #define IMX7D_CKIL			438
>   #define IMX7D_OCOTP_CLK			439
> -#define IMX7D_CLK_END			440
> +#define IMX7D_NAND_RAWNAND_CLK		440
> +#define IMX7D_NAND_USDHC_BUS_RAWNAND_CLK 441
> +#define IMX7D_CLK_END			442
>   #endif /* __DT_BINDINGS_CLOCK_IMX7D_H */