linux-kernel - [PATCH v2 2/5] pwm: dwc: Add 16 channel support for Intel Elkhart Lake

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Message-Id: <20240208070529.28562-3-raag.jadav@intel.com>
Date: Thu,  8 Feb 2024 12:35:26 +0530
From: Raag Jadav <raag.jadav@...el.com>
To: u.kleine-koenig@...gutronix.de,
	jarkko.nikula@...ux.intel.com,
	mika.westerberg@...ux.intel.com,
	andriy.shevchenko@...ux.intel.com,
	lakshmi.sowjanya.d@...el.com
Cc: linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Raag Jadav <raag.jadav@...el.com>
Subject: [PATCH v2 2/5] pwm: dwc: Add 16 channel support for Intel Elkhart Lake

Intel Elkhart Lake PSE includes two instances of PWM as a single PCI
function with 8 channels each. Add support for the remaining channels.

Signed-off-by: Raag Jadav <raag.jadav@...el.com>
Tested-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@...el.com>
---
 drivers/pwm/pwm-dwc.c | 33 +++++++++++++++++++++++++--------
 drivers/pwm/pwm-dwc.h |  5 +++++
 2 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c
index 596a0bb35c40..47d76f5367fe 100644
--- a/drivers/pwm/pwm-dwc.c
+++ b/drivers/pwm/pwm-dwc.c
@@ -25,16 +25,31 @@
 
 #include "pwm-dwc.h"
 
-static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
+/* Elkhart Lake */
+static const struct dwc_pwm_info ehl_pwm_info = {
+	.nr = 2,
+	.size = 0x1000,
+};
+
+static int dwc_pwm_init_one(struct device *dev, void __iomem *base, unsigned int offset)
 {
-	struct device *dev = &pci->dev;
 	struct dwc_pwm *dwc;
-	int ret;
 
 	dwc = dwc_pwm_alloc(dev);
 	if (!dwc)
 		return -ENOMEM;
 
+	dwc->base = base + offset;
+
+	return devm_pwmchip_add(dev, &dwc->chip);
+}
+
+static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
+{
+	const struct dwc_pwm_info *info;
+	struct device *dev = &pci->dev;
+	int i, ret;
+
 	ret = pcim_enable_device(pci);
 	if (ret) {
 		dev_err(dev, "Failed to enable device (%pe)\n", ERR_PTR(ret));
@@ -49,11 +64,13 @@ static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
 		return ret;
 	}
 
-	dwc->base = pcim_iomap_table(pci)[0];
+	info = (const struct dwc_pwm_info *)id->driver_data;
 
-	ret = devm_pwmchip_add(dev, &dwc->chip);
-	if (ret)
-		return ret;
+	for (i = 0; i < info->nr; i++) {
+		ret = dwc_pwm_init_one(dev, pcim_iomap_table(pci)[0], i * info->size);
+		if (ret)
+			return ret;
+	}
 
 	pm_runtime_put(dev);
 	pm_runtime_allow(dev);
@@ -105,7 +122,7 @@ static int dwc_pwm_resume(struct device *dev)
 static DEFINE_SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);
 
 static const struct pci_device_id dwc_pwm_id_table[] = {
-	{ PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */
+	{ PCI_VDEVICE(INTEL, 0x4bb7), (kernel_ulong_t)&ehl_pwm_info },
 	{  }	/* Terminating Entry */
 };
 MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);
diff --git a/drivers/pwm/pwm-dwc.h b/drivers/pwm/pwm-dwc.h
index 64795247c54c..c9bbfc77b568 100644
--- a/drivers/pwm/pwm-dwc.h
+++ b/drivers/pwm/pwm-dwc.h
@@ -33,6 +33,11 @@ MODULE_IMPORT_NS(dwc_pwm);
 #define DWC_TIM_CTRL_INT_MASK	BIT(2)
 #define DWC_TIM_CTRL_PWM	BIT(3)
 
+struct dwc_pwm_info {
+	unsigned int nr;
+	unsigned int size;
+};
+
 struct dwc_pwm_ctx {
 	u32 cnt;
 	u32 cnt2;
-- 
2.35.3