linux-kernel - Re: [PATCH 2/2] ARM: dts: imx7: add USDHC NAND clock to SDHC instances

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Date:   Tue, 4 Apr 2017 23:15:24 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Stefan Agner <stefan@...er.ch>
Cc:     Dong Aisheng <dongas86@...il.com>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Dong Aisheng <aisheng.dong@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-clk@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: imx7: add USDHC NAND clock to SDHC instances

On Sun, Apr 2, 2017 at 2:02 PM, Fabio Estevam <festevam@...il.com> wrote:
> On Sat, Apr 1, 2017 at 1:15 AM, Stefan Agner <stefan@...er.ch> wrote:
>
>> IMX7D_IPG_ROOT_CLK is currently not a valid clock in upstream... So we
>> would have to add it to the clock driver first.
>>
>> I guess we could/should add it anyway at one point? But probably also as
>> init on, just to make sure Linux does not disable it since it is
>> currently used by several IPs implicitly.
>
> Yes, I made a previous attempt do add  IMX7D_IPG_ROOT_CLK and it did
> not work as I did not put it in the init_on clock list.
>
> Will submit a new patch adding it to init_on, thanks.

I thought that adding IMX7D_IPG_ROOT_CLK would do the trick, but the
patch below also causes the kernel to not boot:

--- a/drivers/clk/imx/clk-imx7d.c
+++ b/drivers/clk/imx/clk-imx7d.c
@@ -386,7 +386,7 @@ static int const clks_init_on[] __initconst = {
        IMX7D_PLL_SYS_MAIN_480M_CLK, IMX7D_NAND_USDHC_BUS_ROOT_CLK,
        IMX7D_DRAM_PHYM_ROOT_CLK, IMX7D_DRAM_ROOT_CLK,
        IMX7D_DRAM_PHYM_ALT_ROOT_CLK, IMX7D_DRAM_ALT_ROOT_CLK,
-       IMX7D_AHB_CHANNEL_ROOT_CLK,
+       IMX7D_AHB_CHANNEL_ROOT_CLK, IMX7D_IPG_ROOT_CLK,
 };

 static struct clk_onecell_data clk_data;
@@ -788,7 +788,7 @@ static void __init imx7d_clocks_init(struct
device_node *ccm_node)
        clks[IMX7D_WRCLK_ROOT_DIV] =
imx_clk_divider2("wrclk_post_div", "wrclk_pre_div", base + 0xbd00, 0,
6);
        clks[IMX7D_CLKO1_ROOT_DIV] =
imx_clk_divider2("clko1_post_div", "clko1_pre_div", base + 0xbd80, 0,
6);
        clks[IMX7D_CLKO2_ROOT_DIV] =
imx_clk_divider2("clko2_post_div", "clko2_pre_div", base + 0xbe00, 0,
6);
-
+       clks[IMX7D_IPG_ROOT_CLK] = imx_clk_divider2("ipg_root_clk",
"ahb_root_clk", base + 0x9080, 0, 2);
        clks[IMX7D_ARM_A7_ROOT_CLK] = imx_clk_gate4("arm_a7_root_clk",
"arm_a7_div", base + 0x4000, 0);
        clks[IMX7D_ARM_M4_ROOT_CLK] = imx_clk_gate4("arm_m4_root_clk",
"arm_m4_div", base + 0x4010, 0);
        clks[IMX7D_ARM_M0_ROOT_CLK] = imx_clk_gate4("arm_m0_root_clk",
"arm_m0_div", base + 0x4020, 0);