Re: [PATCH v2] clk: imx8mm: Switch to platform driver

[Schrempf Frieder <frieder.schrempf@kontron.de>]

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@nxp.com>
> Acked-by: Stephen Boyd <sboyd@kernel.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);
>