Re: [PATCH V8 3/6] soc: imx: add i.MX93 SRC power domain driver

[Shawn Guo <shawnguo@kernel.org>]

On Tue, Aug 23, 2022 at 01:52:12PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> Support controlling power domain managed by System Reset
> Controller(SRC). Current supported power domain is mediamix power
> domain.
> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
>  drivers/soc/imx/Kconfig     |   8 ++
>  drivers/soc/imx/Makefile    |   1 +
>  drivers/soc/imx/imx93-pd.c  | 164 ++++++++++++++++++++++++++++++++++++
>  drivers/soc/imx/imx93-src.c |  33 ++++++++
>  4 files changed, 206 insertions(+)
>  create mode 100644 drivers/soc/imx/imx93-pd.c
>  create mode 100644 drivers/soc/imx/imx93-src.c
> 
> diff --git a/drivers/soc/imx/Kconfig b/drivers/soc/imx/Kconfig
> index a840494e849a..4b906791d6c7 100644
> --- a/drivers/soc/imx/Kconfig
> +++ b/drivers/soc/imx/Kconfig
> @@ -20,4 +20,12 @@ config SOC_IMX8M
>  	  support, it will provide the SoC info like SoC family,
>  	  ID and revision etc.
>  
> +config SOC_IMX9
> +	tristate "i.MX9 SoC family support"
> +	depends on ARCH_MXC || COMPILE_TEST
> +	default ARCH_MXC && ARM64
> +	select SOC_BUS
> +	help
> +	  If you say yes here, you get support for the NXP i.MX9 family
> +
>  endmenu
> diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
> index 63cd29f6d4d2..a0baa2a01adb 100644
> --- a/drivers/soc/imx/Makefile
> +++ b/drivers/soc/imx/Makefile
> @@ -7,3 +7,4 @@ obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
>  obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o
>  obj-$(CONFIG_SOC_IMX8M) += imx8m-blk-ctrl.o
>  obj-$(CONFIG_SOC_IMX8M) += imx8mp-blk-ctrl.o
> +obj-$(CONFIG_SOC_IMX9) += imx93-src.o imx93-pd.o
> diff --git a/drivers/soc/imx/imx93-pd.c b/drivers/soc/imx/imx93-pd.c
> new file mode 100644
> index 000000000000..042a89cb53da
> --- /dev/null
> +++ b/drivers/soc/imx/imx93-pd.c
> @@ -0,0 +1,164 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2022 NXP
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/of_device.h>
> +#include <linux/delay.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_domain.h>

Can we sort these headers alphabetically?

> +
> +#define MIX_SLICE_SW_CTRL_OFF		0x20
> +#define SLICE_SW_CTRL_PSW_CTRL_OFF_MASK	BIT(4)
> +#define SLICE_SW_CTRL_PDN_SOFT_MASK	BIT(31)
> +
> +#define MIX_FUNC_STAT_OFF		0xB4
> +
> +#define FUNC_STAT_PSW_STAT_MASK		BIT(0)
> +#define FUNC_STAT_RST_STAT_MASK		BIT(2)
> +#define FUNC_STAT_ISO_STAT_MASK		BIT(4)
> +
> +struct imx93_power_domain {
> +	struct generic_pm_domain genpd;
> +	struct device *dev;
> +	void __iomem *addr;
> +	struct clk_bulk_data *clks;
> +	int num_clks;
> +	bool init_off;
> +};
> +
> +#define to_imx93_pd(_genpd) container_of(_genpd, struct imx93_power_domain, genpd)
> +
> +static int imx93_pd_on(struct generic_pm_domain *genpd)
> +{
> +	struct imx93_power_domain *domain = to_imx93_pd(genpd);
> +	void __iomem *addr = domain->addr;
> +	u32 val;
> +	int ret;
> +
> +	ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks);
> +	if (ret) {
> +		dev_err(domain->dev, "failed to enable clocks for domain: %s\n", genpd->name);
> +		return ret;
> +	}
> +
> +	val = readl(addr + MIX_SLICE_SW_CTRL_OFF);
> +	val &= ~SLICE_SW_CTRL_PDN_SOFT_MASK;
> +	writel(val, addr + MIX_SLICE_SW_CTRL_OFF);
> +
> +	ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val,
> +				 !(val & FUNC_STAT_ISO_STAT_MASK), 1, 10000);
> +	if (ret) {
> +		dev_err(domain->dev, "pd_on timeout: name: %s, stat: %x\n", genpd->name, val);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int imx93_pd_off(struct generic_pm_domain *genpd)
> +{
> +	struct imx93_power_domain *domain = to_imx93_pd(genpd);
> +	void __iomem *addr = domain->addr;
> +	int ret;
> +	u32 val;
> +
> +	/* Power off MIX */
> +	val = readl(addr + MIX_SLICE_SW_CTRL_OFF);
> +	val |= SLICE_SW_CTRL_PDN_SOFT_MASK;
> +	writel(val, addr + MIX_SLICE_SW_CTRL_OFF);
> +
> +	ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val,
> +				 val & FUNC_STAT_PSW_STAT_MASK, 1, 1000);
> +	if (ret) {
> +		dev_err(domain->dev, "pd_off timeout: name: %s, stat: %x\n", genpd->name, val);
> +		return ret;
> +	}
> +
> +	clk_bulk_disable_unprepare(domain->num_clks, domain->clks);
> +
> +	return 0;
> +};
> +
> +static int imx93_pd_remove(struct platform_device *pdev)
> +{
> +	struct imx93_power_domain *domain = platform_get_drvdata(pdev);
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +
> +	if (!domain->init_off)
> +		clk_bulk_disable_unprepare(domain->num_clks, domain->clks);
> +
> +	of_genpd_del_provider(np);
> +	pm_genpd_remove(&domain->genpd);
> +
> +	return 0;
> +}
> +
> +static int imx93_pd_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct imx93_power_domain *domain;
> +	int ret;
> +
> +	domain = devm_kzalloc(dev, sizeof(*domain), GFP_KERNEL);
> +	if (!domain)
> +		return -ENOMEM;
> +
> +	domain->addr = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(domain->addr))
> +		return PTR_ERR(domain->addr);
> +
> +	domain->num_clks = devm_clk_bulk_get_all(dev, &domain->clks);
> +	if (domain->num_clks < 0)
> +		return dev_err_probe(dev, domain->num_clks, "Failed to get domain's clocks\n");
> +
> +	domain->genpd.name = dev_name(dev);
> +	domain->genpd.power_off = imx93_pd_off;
> +	domain->genpd.power_on = imx93_pd_on;
> +	domain->dev = dev;
> +
> +	domain->init_off = readl(domain->addr + MIX_FUNC_STAT_OFF) & FUNC_STAT_ISO_STAT_MASK;
> +	/* Just to sync the status of hardware */
> +	if (!domain->init_off) {
> +		ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks);
> +		if (ret) {
> +			dev_err(domain->dev, "failed to enable clocks for domain: %s\n",
> +				domain->genpd.name);
> +			return ret;
> +		}
> +	}
> +
> +	ret = pm_genpd_init(&domain->genpd, NULL, domain->init_off);
> +	if (ret)
> +		return ret;
> +
> +	platform_set_drvdata(pdev, domain);
> +
> +	return of_genpd_add_provider_simple(np, &domain->genpd);
> +}
> +
> +static const struct of_device_id imx93_dt_ids[] = {

Can we make the variable name a bit driver specific? 'imx93_dt_ids' is
used in both this power domain and SRC driver below.

> +	{ .compatible = "fsl,imx93-src-slice" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, imx93_dt_ids);
> +
> +static struct platform_driver imx93_power_domain_driver = {
> +	.driver = {
> +		.name	= "imx93_power_domain",
> +		.owner	= THIS_MODULE,
> +		.of_match_table = imx93_dt_ids,
> +	},
> +	.probe = imx93_pd_probe,
> +	.remove = imx93_pd_remove,
> +};
> +module_platform_driver(imx93_power_domain_driver);
> +
> +MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
> +MODULE_DESCRIPTION("NXP i.MX93 power domain driver");
> +MODULE_LICENSE("GPL");

Considering 'SPDX-License-Identifier: GPL-2.0' above, should we use
"GPL v2" here?

Shawn

> diff --git a/drivers/soc/imx/imx93-src.c b/drivers/soc/imx/imx93-src.c
> new file mode 100644
> index 000000000000..830cbb9541c1
> --- /dev/null
> +++ b/drivers/soc/imx/imx93-src.c
> @@ -0,0 +1,33 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2022 NXP
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +
> +static int imx93_src_probe(struct platform_device *pdev)
> +{
> +	return devm_of_platform_populate(&pdev->dev);
> +}
> +
> +static const struct of_device_id imx93_dt_ids[] = {
> +	{ .compatible = "fsl,imx93-src" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, imx93_dt_ids);
> +
> +static struct platform_driver imx93_src_driver = {
> +	.driver = {
> +		.name	= "imx93_src",
> +		.owner	= THIS_MODULE,
> +		.of_match_table = imx93_dt_ids,
> +	},
> +	.probe = imx93_src_probe,
> +};
> +module_platform_driver(imx93_src_driver);
> +
> +MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
> +MODULE_DESCRIPTION("NXP i.MX93 src driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.37.1
>