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Date: Thu, 6 Feb 2020 10:34:23 +0000
From: Schrempf Frieder <frieder.schrempf@...tron.de>
To: Abel Vesa <abel.vesa@....com>,
Mike Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Shawn Guo <shawnguo@...nel.org>,
"Sascha Hauer" <kernel@...gutronix.de>,
Fabio Estevam <fabio.estevam@....com>,
"Anson Huang" <anson.huang@....com>, Jacky Bai <ping.bai@....com>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
NXP Linux Team <linux-imx@....com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
Peng Fan <peng.fan@....com>
Subject: Re: [PATCH v2] clk: imx8mm: Switch to platform driver
Hi,
On 09.07.19 16:20, Abel Vesa wrote:
> There is no strong reason for this to use CLK_OF_DECLARE instead
> of being a platform driver. Plus, this will now be aligned with the
> other i.MX8M clock drivers which are platform drivers.
>
> In order to make the clock provider a platform driver
> all the data and code needs to be outside of .init section.
>
> Signed-off-by: Abel Vesa <abel.vesa@....com>
> Acked-by: Stephen Boyd <sboyd@...nel.org>
This has been upstream for quite some time now, but somehow I have an
issue with SPI on the i.MX8MM that gets resolved when I revert this patch.
When I try to probe an SPI NOR flash with latest 5.4 or even 5.5:
spi_imx 30820000.spi: dma setup error -19, use pio
spi-nor spi0.0: unrecognized JEDEC id bytes: 00 00 00 00 00 00
spi_imx 30820000.spi: probed
When I revert this patch:
spi_imx 30820000.spi: dma setup error -19, use pio
spi-nor spi0.0: mx25r1635f (2048 Kbytes)
spi_imx 30820000.spi: probed
Please note, that in both cases I have disabled DMA, as this causes even
more trouble (see [1]). But even with DMA enabled and ignoring the DMA
errors, the issue described above occurs.
Does someone have an idea what's wrong?
Am I the only user of SPI on i.MX8MM as this issue seems to exist
upstream since v5.4-rc1?
Thanks,
Frieder
> ---
>
> Changes since v1:
> * Switched to platform driver memory mapping API
> * Removed extra newline
> * Added an explanation of why this change is done
> in the commit message
>
> drivers/clk/imx/clk-imx8mm.c | 57 ++++++++++++++++++++++++++++----------------
> 1 file changed, 36 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/clk/imx/clk-imx8mm.c b/drivers/clk/imx/clk-imx8mm.c
> index 6b8e75d..7a8e713 100644
> --- a/drivers/clk/imx/clk-imx8mm.c
> +++ b/drivers/clk/imx/clk-imx8mm.c
> @@ -68,43 +68,43 @@ static const struct imx_pll14xx_rate_table imx8mm_drampll_tbl[] = {
> PLL_1443X_RATE(650000000U, 325, 3, 2, 0),
> };
>
> -static struct imx_pll14xx_clk imx8mm_audio_pll __initdata = {
> +static struct imx_pll14xx_clk imx8mm_audio_pll = {
> .type = PLL_1443X,
> .rate_table = imx8mm_audiopll_tbl,
> .rate_count = ARRAY_SIZE(imx8mm_audiopll_tbl),
> };
>
> -static struct imx_pll14xx_clk imx8mm_video_pll __initdata = {
> +static struct imx_pll14xx_clk imx8mm_video_pll = {
> .type = PLL_1443X,
> .rate_table = imx8mm_videopll_tbl,
> .rate_count = ARRAY_SIZE(imx8mm_videopll_tbl),
> };
>
> -static struct imx_pll14xx_clk imx8mm_dram_pll __initdata = {
> +static struct imx_pll14xx_clk imx8mm_dram_pll = {
> .type = PLL_1443X,
> .rate_table = imx8mm_drampll_tbl,
> .rate_count = ARRAY_SIZE(imx8mm_drampll_tbl),
> };
>
> -static struct imx_pll14xx_clk imx8mm_arm_pll __initdata = {
> +static struct imx_pll14xx_clk imx8mm_arm_pll = {
> .type = PLL_1416X,
> .rate_table = imx8mm_pll1416x_tbl,
> .rate_count = ARRAY_SIZE(imx8mm_pll1416x_tbl),
> };
>
> -static struct imx_pll14xx_clk imx8mm_gpu_pll __initdata = {
> +static struct imx_pll14xx_clk imx8mm_gpu_pll = {
> .type = PLL_1416X,
> .rate_table = imx8mm_pll1416x_tbl,
> .rate_count = ARRAY_SIZE(imx8mm_pll1416x_tbl),
> };
>
> -static struct imx_pll14xx_clk imx8mm_vpu_pll __initdata = {
> +static struct imx_pll14xx_clk imx8mm_vpu_pll = {
> .type = PLL_1416X,
> .rate_table = imx8mm_pll1416x_tbl,
> .rate_count = ARRAY_SIZE(imx8mm_pll1416x_tbl),
> };
>
> -static struct imx_pll14xx_clk imx8mm_sys_pll __initdata = {
> +static struct imx_pll14xx_clk imx8mm_sys_pll = {
> .type = PLL_1416X,
> .rate_table = imx8mm_pll1416x_tbl,
> .rate_count = ARRAY_SIZE(imx8mm_pll1416x_tbl),
> @@ -374,7 +374,7 @@ static const char *imx8mm_clko1_sels[] = {"osc_24m", "sys_pll1_800m", "osc_27m",
> static struct clk *clks[IMX8MM_CLK_END];
> static struct clk_onecell_data clk_data;
>
> -static struct clk ** const uart_clks[] __initconst = {
> +static struct clk ** const uart_clks[] = {
> &clks[IMX8MM_CLK_UART1_ROOT],
> &clks[IMX8MM_CLK_UART2_ROOT],
> &clks[IMX8MM_CLK_UART3_ROOT],
> @@ -382,19 +382,20 @@ static struct clk ** const uart_clks[] __initconst = {
> NULL
> };
>
> -static int __init imx8mm_clocks_init(struct device_node *ccm_node)
> +static int imx8mm_clocks_probe(struct platform_device *pdev)
> {
> - struct device_node *np;
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> void __iomem *base;
> int ret;
>
> clks[IMX8MM_CLK_DUMMY] = imx_clk_fixed("dummy", 0);
> - clks[IMX8MM_CLK_24M] = of_clk_get_by_name(ccm_node, "osc_24m");
> - clks[IMX8MM_CLK_32K] = of_clk_get_by_name(ccm_node, "osc_32k");
> - clks[IMX8MM_CLK_EXT1] = of_clk_get_by_name(ccm_node, "clk_ext1");
> - clks[IMX8MM_CLK_EXT2] = of_clk_get_by_name(ccm_node, "clk_ext2");
> - clks[IMX8MM_CLK_EXT3] = of_clk_get_by_name(ccm_node, "clk_ext3");
> - clks[IMX8MM_CLK_EXT4] = of_clk_get_by_name(ccm_node, "clk_ext4");
> + clks[IMX8MM_CLK_24M] = of_clk_get_by_name(np, "osc_24m");
> + clks[IMX8MM_CLK_32K] = of_clk_get_by_name(np, "osc_32k");
> + clks[IMX8MM_CLK_EXT1] = of_clk_get_by_name(np, "clk_ext1");
> + clks[IMX8MM_CLK_EXT2] = of_clk_get_by_name(np, "clk_ext2");
> + clks[IMX8MM_CLK_EXT3] = of_clk_get_by_name(np, "clk_ext3");
> + clks[IMX8MM_CLK_EXT4] = of_clk_get_by_name(np, "clk_ext4");
>
> np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-anatop");
> base = of_iomap(np, 0);
> @@ -480,10 +481,10 @@ static int __init imx8mm_clocks_init(struct device_node *ccm_node)
> clks[IMX8MM_SYS_PLL2_500M] = imx_clk_fixed_factor("sys_pll2_500m", "sys_pll2_out", 1, 2);
> clks[IMX8MM_SYS_PLL2_1000M] = imx_clk_fixed_factor("sys_pll2_1000m", "sys_pll2_out", 1, 1);
>
> - np = ccm_node;
> - base = of_iomap(np, 0);
> - if (WARN_ON(!base))
> - return -ENOMEM;
> + np = dev->of_node;
> + base = devm_platform_ioremap_resource(pdev, 0);
> + if (WARN_ON(IS_ERR(base)))
> + return PTR_ERR(base);
>
> /* Core Slice */
> clks[IMX8MM_CLK_A53_SRC] = imx_clk_mux2("arm_a53_src", base + 0x8000, 24, 3, imx8mm_a53_sels, ARRAY_SIZE(imx8mm_a53_sels));
> @@ -682,4 +683,18 @@ static int __init imx8mm_clocks_init(struct device_node *ccm_node)
>
> return 0;
> }
> -CLK_OF_DECLARE_DRIVER(imx8mm, "fsl,imx8mm-ccm", imx8mm_clocks_init);
> +
> +static const struct of_device_id imx8mm_clk_of_match[] = {
> + { .compatible = "fsl,imx8mm-ccm" },
> + { /* Sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, imx8mm_clk_of_match);
> +
> +static struct platform_driver imx8mm_clk_driver = {
> + .probe = imx8mm_clocks_probe,
> + .driver = {
> + .name = "imx8mm-ccm",
> + .of_match_table = of_match_ptr(imx8mm_clk_of_match),
> + },
> +};
> +module_platform_driver(imx8mm_clk_driver);
>
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