linux-kernel - [PATCH v2] pinctrl: tegra: Add support to display pin function

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Message-ID: <20230713082106.838-1-pshete@nvidia.com>
Date:   Thu, 13 Jul 2023 13:51:06 +0530
From:   Prathamesh Shete <pshete@...dia.com>
To:     <linus.walleij@...aro.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <linux-gpio@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <pshete@...dia.com>
Subject: [PATCH v2] pinctrl: tegra: Add support to display pin function

The current function for a given pin is not displayed via the debugfs.
Add support to display the current function that is set for each pin.

Signed-off-by: Prathamesh Shete <pshete@...dia.com>
---
 drivers/pinctrl/tegra/pinctrl-tegra.c | 19 +++++++++++++++++--
 drivers/pinctrl/tegra/pinctrl-tegra.h |  2 ++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
index 4547cf66d03b..4da8873942cf 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra.c
@@ -96,6 +96,7 @@ static const struct cfg_param {
 	{"nvidia,slew-rate-falling",	TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING},
 	{"nvidia,slew-rate-rising",	TEGRA_PINCONF_PARAM_SLEW_RATE_RISING},
 	{"nvidia,drive-type",		TEGRA_PINCONF_PARAM_DRIVE_TYPE},
+	{"nvidia,function",			TEGRA_PINCONF_PARAM_FUNCTION},
 };
 
 static int tegra_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
@@ -470,6 +471,12 @@ static int tegra_pinconf_reg(struct tegra_pmx *pmx,
 		*bit = g->drvtype_bit;
 		*width = 2;
 		break;
+	case TEGRA_PINCONF_PARAM_FUNCTION:
+		*bank = g->mux_bank;
+		*reg = g->mux_reg;
+		*bit = g->mux_bit;
+		*width = 2;
+		break;
 	default:
 		dev_err(pmx->dev, "Invalid config param %04x\n", param);
 		return -ENOTSUPP;
@@ -620,6 +627,7 @@ static void tegra_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 	s8 bank, bit, width;
 	s32 reg;
 	u32 val;
+	u8 idx;
 
 	g = &pmx->soc->groups[group];
 
@@ -633,8 +641,15 @@ static void tegra_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 		val >>= bit;
 		val &= (1 << width) - 1;
 
-		seq_printf(s, "\n\t%s=%u",
-			   strip_prefix(cfg_params[i].property), val);
+		if (cfg_params[i].param == TEGRA_PINCONF_PARAM_FUNCTION) {
+			idx = pmx->soc->groups[group].funcs[val];
+			seq_printf(s, "\n\t%s=%s",
+				   strip_prefix(cfg_params[i].property),
+					 pmx->functions[idx].name);
+		} else {
+			seq_printf(s, "\n\t%s=%u",
+				   strip_prefix(cfg_params[i].property), val);
+		}
 	}
 }
 
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.h b/drivers/pinctrl/tegra/pinctrl-tegra.h
index b3289bdf727d..e728efeaa4de 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra.h
+++ b/drivers/pinctrl/tegra/pinctrl-tegra.h
@@ -54,6 +54,8 @@ enum tegra_pinconf_param {
 	TEGRA_PINCONF_PARAM_SLEW_RATE_RISING,
 	/* argument: Integer, range is HW-dependant */
 	TEGRA_PINCONF_PARAM_DRIVE_TYPE,
+	/* argument: pinmux settings */
+	TEGRA_PINCONF_PARAM_FUNCTION,
 };
 
 enum tegra_pinconf_pull {
-- 
2.17.1