Quoting Maxime Ripard (2020-02-24 01:06:29)
> diff --git a/drivers/clk/bcm/clk-bcm2711-dvp.c b/drivers/clk/bcm/clk-bcm2711-dvp.c
> new file mode 100644
> index 000000000000..f4773cc92724
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-bcm2711-dvp.c
> @@ -0,0 +1,113 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +// Copyright 2020 Cerno
> +
> +#include <linux/clk-provider.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset-controller.h>
> +#include <linux/reset/reset-simple.h>
> +
> +#define DVP_HT_RPI_SW_INIT 0x04
> +#define DVP_HT_RPI_MISC_CONFIG 0x08
> +
> +#define NR_CLOCKS 2
> +#define NR_RESETS 6
> +
> +struct clk_dvp {
> + struct clk *clks[NR_CLOCKS];
> + struct clk_onecell_data clk_data;
> + struct reset_simple_data reset;
> +};
> +
> +static int clk_dvp_probe(struct platform_device *pdev)
> +{
> + struct resource *res;
> + struct clk_dvp *dvp;
> + void __iomem *base;
> + const char *parent;
> + int ret;
> +
> + dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL);
> + if (!dvp)
> + return -ENOMEM;
> + platform_set_drvdata(pdev, dvp);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + dvp->reset.rcdev.owner = THIS_MODULE;
> + dvp->reset.rcdev.nr_resets = NR_RESETS;
> + dvp->reset.rcdev.ops = &reset_simple_ops;
> + dvp->reset.rcdev.of_node = pdev->dev.of_node;
> + dvp->reset.membase = base + DVP_HT_RPI_SW_INIT;
> + spin_lock_init(&dvp->reset.lock);
> +
> + ret = reset_controller_register(&dvp->reset.rcdev);
> + if (ret)
> + return ret;
> +
> + parent = of_clk_get_parent_name(pdev->dev.of_node, 0);
> + if (!parent)
> + goto unregister_reset;
> +
> + dvp->clks[0] = clk_register_gate(&pdev->dev, "hdmi0-108MHz",
> + parent, CLK_IS_CRITICAL,
> + base + DVP_HT_RPI_MISC_CONFIG, 3,
> + CLK_GATE_SET_TO_DISABLE, &dvp->reset.lock);
> + if (IS_ERR(dvp->clks[0])) {
> + ret = PTR_ERR(dvp->clks[0]);
> + goto unregister_reset;
> + }
> +
> + dvp->clks[1] = clk_register_gate(&pdev->dev, "hdmi1-108MHz",
> + parent, CLK_IS_CRITICAL,
> + base + DVP_HT_RPI_MISC_CONFIG, 4,
> + CLK_GATE_SET_TO_DISABLE, &dvp->reset.lock);
Can we use clk_hw APIs, document why CLK_IS_CRITICAL, and use something
like clk_hw_register_gate_parent_data() so that we don't have to use
of_clk_get_parent_name() above?
> + if (IS_ERR(dvp->clks[1])) {
> + ret = PTR_ERR(dvp->clks[1]);
> + goto unregister_clk0;
> + }
> +
> + dvp->clk_data.clks = dvp->clks;
> + dvp->clk_data.clk_num = NR_CLOCKS;
> + of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get,
> + &dvp->clk_data);
This can fail. Please recover. Also, please use clk_hw based APIs.
> +
> + return 0;
> +
> +
> +unregister_clk0:
> + clk_unregister_gate(dvp->clks[0]);
> +
> +unregister_reset:
> + reset_controller_unregister(&dvp->reset.rcdev);
> + return ret;
> +};
> +
> +static int clk_dvp_remove(struct platform_device *pdev)
> +{
> + struct clk_dvp *dvp = platform_get_drvdata(pdev);
> +
> + clk_unregister_gate(dvp->clks[1]);
> + clk_unregister_gate(dvp->clks[0]);
> + reset_controller_unregister(&dvp->reset.rcdev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id clk_dvp_dt_ids[] = {
> + { .compatible = "brcm,brcm2711-dvp", },
> + { /* sentinel */ },
Please drop comma after this so we can't put anything after lest it
cause a compiler error.
> +};
> +
> +static struct platform_driver clk_dvp_driver = {
> + .probe = clk_dvp_probe,
> + .remove = clk_dvp_remove,
> + .driver = {
> + .name = "brcm2711-dvp",
> + .of_match_table = clk_dvp_dt_ids,
> + },
> +};
> +module_platform_driver(clk_dvp_driver);
> --
> git-series 0.9.1
