df76234276
In BCM2711 the new RPiVid ASB took over V3D. The old ASB is still present
with the ISP and H264 bits, and V3D is in the same place in the new ASB
as the old one.
As per the devicetree bindings, BCM2711 will provide both the old and
new ASB resources, so get both of them and pass them into
'bcm2835-power,' which will take care of selecting which one to use
accordingly.
Since the RPiVid ASB's resources were being provided prior to formalizing
the bindings[1], also support the old DT files that didn't use
'reg-names.'
[1] See: 7dbe8c62ce ("ARM: dts: Add minimal Raspberry Pi 4 support")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Peter Robinson <pbrobinson@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220625113619.15944-8-stefan.wahren@i2se.com
127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* PM MFD driver for Broadcom BCM2835
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*
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* This driver binds to the PM block and creates the MFD device for
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* the WDT and power drivers.
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/mfd/bcm2835-pm.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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static const struct mfd_cell bcm2835_pm_devs[] = {
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{ .name = "bcm2835-wdt" },
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};
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static const struct mfd_cell bcm2835_power_devs[] = {
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{ .name = "bcm2835-power" },
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};
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static int bcm2835_pm_get_pdata(struct platform_device *pdev,
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struct bcm2835_pm *pm)
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{
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if (of_find_property(pm->dev->of_node, "reg-names", NULL)) {
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struct resource *res;
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pm->base = devm_platform_ioremap_resource_byname(pdev, "pm");
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if (IS_ERR(pm->base))
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return PTR_ERR(pm->base);
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "asb");
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if (res) {
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pm->asb = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(pm->asb))
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pm->asb = NULL;
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}
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"rpivid_asb");
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if (res) {
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pm->rpivid_asb = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(pm->rpivid_asb))
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pm->rpivid_asb = NULL;
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}
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return 0;
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}
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/* If no 'reg-names' property is found we can assume we're using old DTB. */
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pm->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(pm->base))
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return PTR_ERR(pm->base);
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pm->asb = devm_platform_ioremap_resource(pdev, 1);
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if (IS_ERR(pm->asb))
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pm->asb = NULL;
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pm->rpivid_asb = devm_platform_ioremap_resource(pdev, 2);
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if (IS_ERR(pm->rpivid_asb))
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pm->rpivid_asb = NULL;
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return 0;
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}
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static int bcm2835_pm_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct bcm2835_pm *pm;
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int ret;
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pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
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if (!pm)
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return -ENOMEM;
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platform_set_drvdata(pdev, pm);
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pm->dev = dev;
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ret = bcm2835_pm_get_pdata(pdev, pm);
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if (ret)
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return ret;
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ret = devm_mfd_add_devices(dev, -1,
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bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
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NULL, 0, NULL);
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if (ret)
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return ret;
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/*
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* We'll use the presence of the AXI ASB regs in the
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* bcm2835-pm binding as the key for whether we can reference
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* the full PM register range and support power domains.
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*/
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if (pm->asb)
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return devm_mfd_add_devices(dev, -1, bcm2835_power_devs,
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ARRAY_SIZE(bcm2835_power_devs),
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NULL, 0, NULL);
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return 0;
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}
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static const struct of_device_id bcm2835_pm_of_match[] = {
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{ .compatible = "brcm,bcm2835-pm-wdt", },
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{ .compatible = "brcm,bcm2835-pm", },
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{ .compatible = "brcm,bcm2711-pm", },
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{},
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};
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MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
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static struct platform_driver bcm2835_pm_driver = {
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.probe = bcm2835_pm_probe,
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.driver = {
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.name = "bcm2835-pm",
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.of_match_table = bcm2835_pm_of_match,
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},
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};
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module_platform_driver(bcm2835_pm_driver);
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MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
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MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
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MODULE_LICENSE("GPL");
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