Re: [PATCH 08/10] clk: mvebu Add the time base generator clocks for Armada 3700

Stephen Boyd
2016-06-30T19:48:17Z

On 06/10, Gregory CLEMENT wrote:
> +
> +struct tbg_def tbg[NUM_TBG] = {

const?

> + {"TBG-A-P", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL8, TBG_A_VCODIV_DIFF},
> + {"TBG-B-P", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL8, TBG_B_VCODIV_DIFF},
> + {"TBG-A-S", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL1, TBG_A_VCODIV_SE},
> + {"TBG-B-S", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL1, TBG_B_VCODIV_SE},
> +};
> +
> +static struct clk_onecell_data clk_tbg_data;

Please allocate this in the driver probe.

> +
> +unsigned int tbg_get_mult(void __iomem *reg, struct tbg_def *ptbg)
> +{
> + u32 val;
> +
> + val = readl(reg + TBG_CTRL0);
> +
> + return ((val >> ptbg->fbdiv_offset) & TBG_DIV_MASK) << 2;
> +}
> +
> +unsigned int tbg_get_div(void __iomem *reg, struct tbg_def *ptbg)
> +{
> + u32 val;
> + unsigned int div;
> +
> + val = readl(reg + TBG_CTRL7);
> +
> + div = (val >> ptbg->refdiv_offset) & TBG_DIV_MASK;
> + if (div == 0)
> + div = 1;
> + val = readl(reg + ptbg->vcodiv_reg);
> +
> + div *= 1 << ((val >> ptbg->vcodiv_offset) & TBG_DIV_MASK);
> +
> + return div;
> +}
> +
> +
> +static int armada_3700_tbg_clock_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct device *dev = &pdev->dev;
> + const char *parent_name;
> + struct resource *res;
> + struct clk *parent;
> + void __iomem *reg;
> + int i, ret;
> +
> + parent = of_clk_get(np, 0);

Why not devm_clk_get() instead? Don't make things dependent on DT
APIs unnecessarily please.

> + if (IS_ERR(parent)) {
> + dev_err(dev, "Could get the clock parent\n");
> + return -EINVAL;
> + }
> + parent_name = __clk_get_name(parent);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + reg = devm_ioremap_resource(dev, res);
> + if (IS_ERR(reg)) {
> + dev_err(dev, "Could not map the tbg clock registers\n");

devm_ioremap_resource() already spits out an error on failure so
please drop this print.

> + ret = PTR_ERR(reg);
> + goto put_clk;
> + }
> +
> + clk_tbg_data.clk_num = NUM_TBG;
> + clk_tbg_data.clks = devm_kcalloc(dev, clk_tbg_data.clk_num,
> + sizeof(struct clk *), GFP_KERNEL);

Please move to clk_hw based registration.

> + if (!clk_tbg_data.clks) {
> + ret = -ENOMEM;
> + goto put_clk;
> + }
> +
> + for (i = 0; i < NUM_TBG; i++) {
> + const char *name;
> + unsigned int mult, div;
> +
> + name = tbg[i].name;
> + mult = tbg_get_mult(reg, &tbg[i]);
> + div = tbg_get_div(reg, &tbg[i]);
> + clk_tbg_data.clks[i] = clk_register_fixed_factor(NULL, name,
> + parent_name, 0, mult, div);
> + if (IS_ERR(clk_tbg_data.clks[i]))
> + dev_err(dev, "Can't register TBG clock %s\n", name);
> + }
> +
> + of_clk_add_provider(np, of_clk_src_onecell_get, &clk_tbg_data);

What if this fails?

> +
> + return 0;
> +
> +put_clk:
> + clk_put(parent);
> + return ret;
> +}

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