The output pins of the general PWM timer (GPT) can be disabled by
using the port output enabling function for the GPT (POEG).
This patch series add basic support using s/w control through
sysfs to enable/disable output from GPT.
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
drivers/soc/renesas/Kconfig | 2 +
drivers/soc/renesas/Makefile | 2 +
drivers/soc/renesas/poeg/Kconfig | 12 +++
drivers/soc/renesas/poeg/Makefile | 2 +
drivers/soc/renesas/poeg/poeg-rzg2l.c | 148 ++++++++++++++++++++++++++
5 files changed, 166 insertions(+)
create mode 100644 drivers/soc/renesas/poeg/Kconfig
create mode 100644 drivers/soc/renesas/poeg/Makefile
create mode 100644 drivers/soc/renesas/poeg/poeg-rzg2l.c
diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
index c50a6ce1b99d..363bfe3340fa 100644
--- a/drivers/soc/renesas/Kconfig
+++ b/drivers/soc/renesas/Kconfig
@@ -330,6 +330,8 @@ config ARCH_R9A09G011
help
This enables support for the Renesas RZ/V2M SoC.
+source "drivers/soc/renesas/poeg/Kconfig"
+
endif # ARM64
config RST_RCAR
diff --git a/drivers/soc/renesas/Makefile b/drivers/soc/renesas/Makefile
index 535868c9c7e4..935bf2cbf31e 100644
--- a/drivers/soc/renesas/Makefile
+++ b/drivers/soc/renesas/Makefile
@@ -36,3 +36,5 @@ obj-$(CONFIG_RST_RCAR) += rcar-rst.o
obj-$(CONFIG_SYSC_RCAR) += rcar-sysc.o
obj-$(CONFIG_SYSC_RCAR_GEN4) += rcar-gen4-sysc.o
obj-$(CONFIG_SYSC_RMOBILE) += rmobile-sysc.o
+
+obj-$(CONFIG_POEG_RZG2L) += poeg/
diff --git a/drivers/soc/renesas/poeg/Kconfig b/drivers/soc/renesas/poeg/Kconfig
new file mode 100644
index 000000000000..d0f123adb8da
--- /dev/null
+++ b/drivers/soc/renesas/poeg/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+config POEG_RZG2L
+ tristate "RZ/G2L poeg support"
+ depends on ARCH_R9A07G044
+ depends on PWM_RZG2L_GPT
+ depends on HAS_IOMEM
+ help
+ This driver exposes the General Port Output Enable for PWM found
+ in RZ/G2L.
+
+ To compile this driver as a module, choose M here: the module
+ will be called poeg-rzg2l.
diff --git a/drivers/soc/renesas/poeg/Makefile b/drivers/soc/renesas/poeg/Makefile
new file mode 100644
index 000000000000..cc1ec08d2021
--- /dev/null
+++ b/drivers/soc/renesas/poeg/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_POEG_RZG2L) += poeg-rzg2l.o
diff --git a/drivers/soc/renesas/poeg/poeg-rzg2l.c b/drivers/soc/renesas/poeg/poeg-rzg2l.c
new file mode 100644
index 000000000000..34f638dc45a6
--- /dev/null
+++ b/drivers/soc/renesas/poeg/poeg-rzg2l.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Renesas RZ/G2L Port Output Enable for GPT (POEG) driver
+ *
+ * Copyright (C) 2022 Renesas Electronics Corporation
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+
+#define POEGG 0
+#define POEGG_SSF BIT(3)
+
+struct rzg2l_poeg_chip {
+ struct reset_control *rstc;
+ void __iomem *mmio;
+};
+
+static void rzg2l_poeg_write(struct rzg2l_poeg_chip *chip, u32 reg, u32 data)
+{
+ iowrite32(data, chip->mmio + reg);
+}
+
+static u32 rzg2l_poeg_read(struct rzg2l_poeg_chip *chip, u32 reg)
+{
+ return ioread32(chip->mmio + reg);
+}
+
+static ssize_t output_disable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct rzg2l_poeg_chip *chip = platform_get_drvdata(pdev);
+ unsigned int val;
+ u32 reg;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ reg = rzg2l_poeg_read(chip, POEGG);
+ if (val)
+ reg |= POEGG_SSF;
+ else
+ reg &= ~POEGG_SSF;
+
+ rzg2l_poeg_write(chip, POEGG, reg);
+
+ return ret ? : count;
+}
+
+static ssize_t output_disable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct rzg2l_poeg_chip *chip = platform_get_drvdata(pdev);
+ u32 reg;
+
+ reg = rzg2l_poeg_read(chip, POEGG);
+
+ return sprintf(buf, "%u\n", (reg & POEGG_SSF) ? 1 : 0);
+}
+static DEVICE_ATTR_RW(output_disable);
+
+static const struct of_device_id rzg2l_poeg_of_table[] = {
+ { .compatible = "renesas,rzg2l-poeg", },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rzg2l_poeg_of_table);
+
+static int rzg2l_poeg_probe(struct platform_device *pdev)
+{
+ struct rzg2l_poeg_chip *chip;
+ int ret;
+
+ chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->mmio = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(chip->mmio))
+ return PTR_ERR(chip->mmio);
+
+ chip->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(chip->rstc))
+ return dev_err_probe(&pdev->dev, PTR_ERR(chip->rstc),
+ "get reset failed\n");
+
+ ret = reset_control_deassert(chip->rstc);
+ if (ret)
+ return ret;
+
+ pm_runtime_enable(&pdev->dev);
+ platform_set_drvdata(pdev, chip);
+
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "pm_runtime_resume_and_get failed: %d\n", ret);
+ goto err;
+ }
+
+ ret = device_create_file(&pdev->dev, &dev_attr_output_disable);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to create poeg sysfs: %d\n", ret);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ pm_runtime_disable(&pdev->dev);
+ reset_control_assert(chip->rstc);
+
+ return ret;
+}
+
+static int rzg2l_poeg_remove(struct platform_device *pdev)
+{
+ struct rzg2l_poeg_chip *chip = platform_get_drvdata(pdev);
+
+ device_remove_file(&pdev->dev, &dev_attr_output_disable);
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ reset_control_assert(chip->rstc);
+
+ return 0;
+}
+
+static struct platform_driver rzg2l_poeg_driver = {
+ .driver = {
+ .name = "poeg-rzg2l",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(rzg2l_poeg_of_table),
+ },
+ .probe = rzg2l_poeg_probe,
+ .remove = rzg2l_poeg_remove,
+};
+module_platform_driver(rzg2l_poeg_driver);
+
+MODULE_AUTHOR("Biju Das <biju.das.jz@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Renesas RZ/G2L POEG Driver");
+MODULE_LICENSE("GPL v2");
--
2.25.1
