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Message-ID: <faacbc33174e77500e04e609a654c5810045cb42.camel@suse.de>
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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