Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates
 216.228.117.160 as permitted sender) receiver=protection.outlook.com;
 client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C
From:   Prathamesh Shete <pshete@nvidia.com>
To:     <linus.walleij@linaro.org>, <thierry.reding@gmail.com>,
        <jonathanh@nvidia.com>, <linux-gpio@vger.kernel.org>,
        <linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC:     <pshete@nvidia.com>
Subject: [PATCH] pinctrl: tegra: Add support to display pin function
Date:   Wed, 12 Jul 2023 19:25:53 +0530
Message-ID: <20230712135553.25162-1-pshete@nvidia.com>
MIME-Version: 1.0
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jul 2023 13:56:13.3233
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 7ce5320b-b3c2-409f-09b6-08db82dfc141
X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com]
X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT079.eop-nam11.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7563
X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,
        DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,
        RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,
        T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=no autolearn_force=no
        version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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@nvidia.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..2752c914f628 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,func",			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