linux-kernel - [PATCH v2 3/4] pinctrl: s32cc: refactor pin config parsing

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Date:   Tue, 21 Mar 2023 00:38:22 +0800
From:   Chester Lin <clin@...e.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Chester Lin <clin@...e.com>, NXP S32 Linux Team <s32@....com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Ghennadi Procopciuc <Ghennadi.Procopciuc@....nxp.com>,
        Andrei Stefanescu <andrei.stefanescu@....com>,
        Radu Pirea <radu-nicolae.pirea@....com>,
        Andreas Färber <afaerber@...e.de>,
        Matthias Brugger <mbrugger@...e.com>
Subject: [PATCH v2 3/4] pinctrl: s32cc: refactor pin config parsing

Move common codes into smaller inline functions and remove some argument
handlings that are not actually used by either S32 MSCR register or generic
config params.

Signed-off-by: Chester Lin <clin@...e.com>
---
Changes in v2:
- Drop unnecessary marcos and s32_pin_config() implemented in v1 and set/clear
  mask/config values transparently.
- Put pull-function related cases together in s32_pin_set_pull().

 drivers/pinctrl/nxp/pinctrl-s32cc.c | 62 +++++++++++++++++------------
 1 file changed, 36 insertions(+), 26 deletions(-)

diff --git a/drivers/pinctrl/nxp/pinctrl-s32cc.c b/drivers/pinctrl/nxp/pinctrl-s32cc.c
index f698e1a240ef..cb8a0844c0fa 100644
--- a/drivers/pinctrl/nxp/pinctrl-s32cc.c
+++ b/drivers/pinctrl/nxp/pinctrl-s32cc.c
@@ -474,11 +474,38 @@ static int s32_get_slew_regval(int arg)
 	return -EINVAL;
 }
 
-static int s32_get_pin_conf(enum pin_config_param param, u32 arg,
-			    unsigned int *mask, unsigned int *config)
+static inline void s32_pin_set_pull(enum pin_config_param param,
+				   unsigned int *mask, unsigned int *config)
 {
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+	case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+		*config &= ~(S32_MSCR_PUS | S32_MSCR_PUE);
+		break;
+	case PIN_CONFIG_BIAS_PULL_UP:
+		*config |= S32_MSCR_PUS | S32_MSCR_PUE;
+		break;
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		*config &= ~S32_MSCR_PUS;
+		*config |= S32_MSCR_PUE;
+		break;
+	default:
+		return;
+	}
+
+	*mask |= S32_MSCR_PUS | S32_MSCR_PUE;
+}
+
+static int s32_parse_pincfg(unsigned long pincfg, unsigned int *mask,
+			    unsigned int *config)
+{
+	enum pin_config_param param;
+	u32 arg;
 	int ret;
 
+	param = pinconf_to_config_param(pincfg);
+	arg = pinconf_to_config_argument(pincfg);
+
 	switch (param) {
 	/* All pins are persistent over suspend */
 	case PIN_CONFIG_PERSIST_STATE:
@@ -488,17 +515,11 @@ static int s32_get_pin_conf(enum pin_config_param param, u32 arg,
 		*mask |= S32_MSCR_ODE;
 		break;
 	case PIN_CONFIG_OUTPUT_ENABLE:
-		if (arg)
-			*config |= S32_MSCR_OBE;
-		else
-			*config &= ~S32_MSCR_OBE;
+		*config |= S32_MSCR_OBE;
 		*mask |= S32_MSCR_OBE;
 		break;
 	case PIN_CONFIG_INPUT_ENABLE:
-		if (arg)
-			*config |= S32_MSCR_IBE;
-		else
-			*config &= ~S32_MSCR_IBE;
+		*config |= S32_MSCR_IBE;
 		*mask |= S32_MSCR_IBE;
 		break;
 	case PIN_CONFIG_SLEW_RATE:
@@ -509,25 +530,16 @@ static int s32_get_pin_conf(enum pin_config_param param, u32 arg,
 		*mask |= S32_MSCR_SRE(~0);
 		break;
 	case PIN_CONFIG_BIAS_PULL_UP:
-		if (arg)
-			*config |= S32_MSCR_PUS;
-		else
-			*config &= ~S32_MSCR_PUS;
-		fallthrough;
 	case PIN_CONFIG_BIAS_PULL_DOWN:
-		if (arg)
-			*config |= S32_MSCR_PUE;
-		else
-			*config &= ~S32_MSCR_PUE;
-		*mask |= S32_MSCR_PUE | S32_MSCR_PUS;
+		s32_pin_set_pull(param, mask, config);
 		break;
 	case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
 		*config &= ~(S32_MSCR_ODE | S32_MSCR_OBE | S32_MSCR_IBE);
 		*mask |= S32_MSCR_ODE | S32_MSCR_OBE | S32_MSCR_IBE;
-		fallthrough;
+		s32_pin_set_pull(param, mask, config);
+		break;
 	case PIN_CONFIG_BIAS_DISABLE:
-		*config &= ~(S32_MSCR_PUS | S32_MSCR_PUE);
-		*mask |= S32_MSCR_PUS | S32_MSCR_PUE;
+		s32_pin_set_pull(param, mask, config);
 		break;
 	default:
 		return -EOPNOTSUPP;
@@ -553,9 +565,7 @@ static int s32_pinconf_mscr_update(struct pinctrl_dev *pctldev,
 		pin_get_name(pctldev, pin_id), num_configs);
 
 	for (i = 0; i < num_configs; i++) {
-		ret = s32_get_pin_conf(pinconf_to_config_param(configs[i]),
-				       pinconf_to_config_argument(configs[i]),
-				       &mask, &config);
+		ret = s32_parse_pincfg(configs[i], &mask, &config);
 		if (ret)
 			return ret;
 	}
-- 
2.37.3