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Date:   Thu, 04 Jun 2020 19:26:07 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Maxime Ripard <maxime@...no.tech>, Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 004/105] clk: bcm: Add BCM2711 DVP driver

Hi Maxime,

On Wed, 2020-05-27 at 17:47 +0200, Maxime Ripard wrote:
> The HDMI block has a block that controls clocks and reset signals to the
> HDMI0 and HDMI1 controllers.

Why not having two separate drivers?

> Let's expose that through a clock driver implementing a clock and reset
> provider.
> 
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Stephen Boyd <sboyd@...nel.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: linux-clk@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Reviewed-by: Stephen Boyd <sboyd@...nel.org>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
>  drivers/clk/bcm/Kconfig           |  11 +++-
>  drivers/clk/bcm/Makefile          |   1 +-
>  drivers/clk/bcm/clk-bcm2711-dvp.c | 127 +++++++++++++++++++++++++++++++-
>  3 files changed, 139 insertions(+)
>  create mode 100644 drivers/clk/bcm/clk-bcm2711-dvp.c
> 
> diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
> index 8c83977a7dc4..784f12c72365 100644
> --- a/drivers/clk/bcm/Kconfig
> +++ b/drivers/clk/bcm/Kconfig
> @@ -1,4 +1,15 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> +
> +config CLK_BCM2711_DVP
> +	tristate "Broadcom BCM2711 DVP support"
> +	depends on ARCH_BCM2835 ||COMPILE_TEST
> +	depends on COMMON_CLK
> +	default ARCH_BCM2835
> +	select RESET_SIMPLE
> +	help
> +	  Enable common clock framework support for the Broadcom BCM2711
> +	  DVP Controller.
> +
>  config CLK_BCM2835
>  	bool "Broadcom BCM2835 clock support"
>  	depends on ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST
> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
> index 0070ddf6cdd2..2c1349062147 100644
> --- a/drivers/clk/bcm/Makefile
> +++ b/drivers/clk/bcm/Makefile
> @@ -6,6 +6,7 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
>  obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
>  obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
>  obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o
> clk-iproc-asiu.o
> +obj-$(CONFIG_CLK_BCM2835)	+= clk-bcm2711-dvp.o
>  obj-$(CONFIG_CLK_BCM2835)	+= clk-bcm2835.o
>  obj-$(CONFIG_CLK_BCM2835)	+= clk-bcm2835-aux.o
>  obj-$(CONFIG_CLK_RASPBERRYPI)	+= clk-raspberrypi.o
> diff --git a/drivers/clk/bcm/clk-bcm2711-dvp.c b/drivers/clk/bcm/clk-bcm2711-
> dvp.c
> new file mode 100644
> index 000000000000..c1c4b5857d32
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-bcm2711-dvp.c
> @@ -0,0 +1,127 @@
> +// 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_hw_onecell_data	*data;
> +	struct reset_simple_data	reset;
> +};
> +
> +static const struct clk_parent_data clk_dvp_parent = {
> +	.index	= 0,
> +};
> +
> +static int clk_dvp_probe(struct platform_device *pdev)
> +{
> +	struct clk_hw_onecell_data *data;
> +	struct resource *res;
> +	struct clk_dvp *dvp;
> +	void __iomem *base;
> +	int ret;
> +
> +	dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL);
> +	if (!dvp)
> +		return -ENOMEM;
> +	platform_set_drvdata(pdev, dvp);
> +
> +	dvp->data = devm_kzalloc(&pdev->dev,
> +				 struct_size(dvp->data, hws, NR_CLOCKS),
> +				 GFP_KERNEL);
> +	if (!dvp->data)
> +		return -ENOMEM;
> +	data = dvp->data;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	base = devm_ioremap_resource(&pdev->dev, res);

I think the cool function to use these days is
devm_platform_get_and_ioremap_resource().

Regards,
Nicolas

> +	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;
> +
> +	data->hws[0] = clk_hw_register_gate_parent_data(&pdev->dev,
> +							"hdmi0-108MHz",
> +							&clk_dvp_parent, 0,
> +							base +
> DVP_HT_RPI_MISC_CONFIG, 3,
> +							CLK_GATE_SET_TO_DISABLE,
> +							&dvp->reset.lock);
> +	if (IS_ERR(data->hws[0])) {
> +		ret = PTR_ERR(data->hws[0]);
> +		goto unregister_reset;
> +	}
> +
> +	data->hws[1] = clk_hw_register_gate_parent_data(&pdev->dev,
> +							"hdmi1-108MHz",
> +							&clk_dvp_parent, 0,
> +							base +
> DVP_HT_RPI_MISC_CONFIG, 4,
> +							CLK_GATE_SET_TO_DISABLE,
> +							&dvp->reset.lock);
> +	if (IS_ERR(data->hws[1])) {
> +		ret = PTR_ERR(data->hws[1]);
> +		goto unregister_clk0;
> +	}
> +
> +	data->num = NR_CLOCKS;
> +	ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,

> +				     data);
> +	if (ret)
> +		goto unregister_clk1;
> +
> +	return 0;
> +
> +unregister_clk1:
> +	clk_hw_unregister_gate(data->hws[1]);
> +
> +unregister_clk0:
> +	clk_hw_unregister_gate(data->hws[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);
> +	struct clk_hw_onecell_data *data = dvp->data;
> +
> +	clk_hw_unregister_gate(data->hws[1]);
> +	clk_hw_unregister_gate(data->hws[0]);
> +	reset_controller_unregister(&dvp->reset.rcdev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id clk_dvp_dt_ids[] = {
> +	{ .compatible = "brcm,brcm2711-dvp", },
> +	{ /* sentinel */ }
> +};
> +
> +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);


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