linux-kernel - Re: [PATCH v2 2/6] clk: sunxi-ng: a31: Register regmap for sun6i CCU

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Date:   Thu, 30 Apr 2020 11:10:36 +0000
From:   Priit Laes <plaes@...es.org>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 2/6] clk: sunxi-ng: a31: Register regmap for sun6i CCU

On Wed, Apr 29, 2020 at 11:46:08PM +0300, Priit Laes wrote:

I somehow messed up this patch when preparing the patchset,
so I'll resend the fixed patch with v3.

> On sun6i, the gmac clock is handled by the dwmac-sunxi driver, but
> its configuration register is located in the CCU register range,
> requiring proper regmap setup.
> 
> In order to do that, we use CLK_OF_DECLARE_DRIVER to initialize
> sun7i ccu, which clears the OF_POPULATED flag, allowing the
> platform device to probe the same resource with device node.
> 
> Signed-off-by: Priit Laes <plaes@...es.org>
> ---
>  drivers/clk/sunxi-ng/ccu-sun6i-a31.c | 60 +++++++++++++++++++++++++++-
>  1 file changed, 58 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu-sun6i-a31.c b/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
> index 9b40d53266a3..086eb93a4efd 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
> @@ -1262,5 +1262,61 @@ static void __init sun6i_a31_ccu_setup(struct device_node *node)
>  	ccu_mux_notifier_register(pll_cpu_clk.common.hw.clk,
>  				  &sun6i_a31_cpu_nb);
>  }
> -CLK_OF_DECLARE(sun6i_a31_ccu, "allwinner,sun6i-a31-ccu",
> -	       sun6i_a31_ccu_setup);
> +CLK_OF_DECLARE_DRIVER(sun6i_a31_ccu, "allwinner,sun6i-a31-ccu",
> +		      sun6i_a31_ccu_setup);
> +
> +/*
> + * Regmap for the GMAC driver (dwmac-sunxi) to allow access to
> + * GMAC configuration register.
> + */
> +#define SUN6I_A31_GMAC_CFG_REG 0xD0
> +static bool sun6i_a31_ccu_regmap_accessible_reg(struct device *dev,
> +						unsigned int reg)
> +{
> +	if (reg == SUN6I_A31_GMAC_CFG_REG)
> +		return true;
> +	return false;
> +}
> +
> +static struct regmap_config sun6i_a31_ccu_regmap_config = {
> +	.reg_bits	= 32,
> +	.val_bits	= 32,
> +	.reg_stride	= 4,
> +	.max_register	= 0x308, /* clk_out_b */
> +
> +	.readable_reg	= sun6i_a31_ccu_regmap_accessible_reg,
> +	.writeable_reg	= sun6i_a31_ccu_regmap_accessible_reg,
> +};
> +
> +static int sun6i_a31_ccu_probe_regmap(struct platform_device *pdev)
> +{
> +	void __iomem *reg;
> +	struct resource *res;
> +	struct regmap *regmap;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> +	if (IS_ERR(reg))
> +		return PTR_ERR(reg);
> +
> +	regmap = devm_regmap_init_mmio(&pdev->dev, reg,
> +				       &sun6i_a31_ccu_regmap_accessible_reg);
> +	if (IS_ERR(regmap))
> +		return PTR_ERR(regmap);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id sun6i_a31_ccu_ids[] = {
> +	{ .compatible = "allwinner,sun6i-a31-ccu"},
> +	{ }
> +};
> +
> +static struct platform_driver sun6i_a31_ccu_driver = {
> +	.probe = sun6i_a31_ccu_probe_regmap,
> +	.driver = {
> +		.name = "sun6i-a31-ccu",
> +		.of_match_table = sun6i_a31_ccu_ids,
> +	},
> +};
> +builtin_platform_driver(sun6i_a31_ccu_driver);
> -- 
> 2.26.2
>