linux-kernel - [PATCH v2 6/6] pinctrl: intel: Enumerate PWM device when community has a capabilitty

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Date:   Tue,  8 Nov 2022 16:22:26 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-pwm@...r.kernel.org
Cc:     Andy Shevchenko <andy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2 6/6] pinctrl: intel: Enumerate PWM device when community has a capabilitty

Some of the Communities may have PWM capability. In such cases,
enumerate PWM device via respective driver. User is still responsible
for setting correct pin muxing for the line that needs to output the
signal.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/pinctrl/intel/pinctrl-intel.c | 29 +++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 6e630e87fed6..6b685ff7041f 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -24,6 +24,8 @@
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinmux.h>
 
+#include <linux/platform_data/x86/pwm-lpss.h>
+
 #include "../core.h"
 #include "pinctrl-intel.h"
 
@@ -49,6 +51,8 @@
 #define PADOWN_MASK(p)			(GENMASK(3, 0) << PADOWN_SHIFT(p))
 #define PADOWN_GPP(p)			((p) / 8)
 
+#define PWMC				0x204
+
 /* Offset from pad_regs */
 #define PADCFG0				0x000
 #define PADCFG0_RXEVCFG_SHIFT		25
@@ -1502,6 +1506,27 @@ static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
 	return 0;
 }
 
+static int intel_pinctrl_probe_pwm(struct intel_pinctrl *pctrl,
+				   struct intel_community *community)
+{
+	static const struct pwm_lpss_boardinfo info = {
+		.clk_rate = 19200000,
+		.npwm = 1,
+		.base_unit_bits = 22,
+		.bypass = true,
+	};
+	struct pwm_lpss_chip *pwm;
+
+	if (!(community->features & PINCTRL_FEATURE_PWM))
+		return 0;
+
+	pwm = pwm_lpss_probe(pctrl->dev, community->regs + PWMC, &info);
+	if (IS_ERR(pwm) && PTR_ERR(pwm) != -ENODEV)
+		return PTR_ERR(pwm);
+
+	return 0;
+}
+
 static int intel_pinctrl_probe(struct platform_device *pdev,
 			       const struct intel_pinctrl_soc_data *soc_data)
 {
@@ -1588,6 +1613,10 @@ static int intel_pinctrl_probe(struct platform_device *pdev,
 			ret = intel_pinctrl_add_padgroups_by_size(pctrl, community);
 		if (ret)
 			return ret;
+
+		ret = intel_pinctrl_probe_pwm(pctrl, community);
+		if (ret)
+			return ret;
 	}
 
 	irq = platform_get_irq(pdev, 0);
-- 
2.35.1