From patchwork Fri Nov  4 03:16:36 2022
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Dmitry Torokhov <dmitry.torokhov@gmail.com>
X-Patchwork-Id: 622854
Return-Path: <linux-omap-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
 aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
 by smtp.lore.kernel.org (Postfix) with ESMTP id 47441C4321E
 for <linux-omap@archiver.kernel.org>; Fri,  4 Nov 2022 03:17:36 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
 id S230427AbiKDDRc (ORCPT <rfc822;linux-omap@archiver.kernel.org>);
 Thu, 3 Nov 2022 23:17:32 -0400
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51768 "EHLO
 lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
 with ESMTP id S230511AbiKDDRB (ORCPT
 <rfc822;linux-omap@vger.kernel.org>); Thu, 3 Nov 2022 23:17:01 -0400
Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com
 [IPv6:2607:f8b0:4864:20::42b])
 by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 392B725E91;
 Thu,  3 Nov 2022 20:17:00 -0700 (PDT)
Received: by mail-pf1-x42b.google.com with SMTP id i3so3376327pfc.11;
 Thu, 03 Nov 2022 20:17:00 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112;
 h=content-transfer-encoding:mime-version:references:in-reply-to
 :message-id:date:subject:cc:to:from:from:to:cc:subject:date
 :message-id:reply-to;
 bh=nekMKek88OrPUkYJ4VB8OmAAcdm9+OSYr1boF1eblE0=;
 b=oPYniO1MtADtJtuw4q4+C20hdzvodf6jSrPaX3J9tWE9wbkPGVDQeExemFb+FhE0/x
 h86dPAwa3MqkgKsCjfvra8knhjsbtHsa1EVMrFS+egrOi/ZYv0A/Zeorm40BXXHsfgyo
 MFifWX4YicxVyj6KbftzPWM9+gwEpnLd++s1w5jKCSVvQSIXC0dMAnl7P/xDanNHcJon
 Lhfwx1syQS+XZY1CBvg4E9HkddvJvXPO4f9aoZF4RB2PY/lV+eiQaO9k1hnWiA2ldYhQ
 g102yHZvQ5Ff8Ptv7Xwb0pZdS8hBWUrX4TuSMDQ4dcEOEIfrqkWCWRF2hd365tHI7Kte
 CSqQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20210112;
 h=content-transfer-encoding:mime-version:references:in-reply-to
 :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc
 :subject:date:message-id:reply-to;
 bh=nekMKek88OrPUkYJ4VB8OmAAcdm9+OSYr1boF1eblE0=;
 b=l7OUjsEZPhsuq9FMWrVKLPle6GfAx1wWWDvwFXqPbGp1ZA3HIoKSKok+7xvzXGfu7z
 JXWwVj7hDAROaIFu8lySiIvKPJzBCYNHUANAS2FWo3HpJBHIe0UkXgc1skVtd+spiLBt
 T6Fe2bzQIhB7preRhps+cwjd0wgJeY40c9BoszSd8INZuoMDm06LN30l7sW1v3ZzOMQ9
 FXCspZxKaxXNDY4Hok1hgkEqSgUXEyO1T3NlSiprCodm1Sk91fHQ3eGbmVSva8fMaxnL
 t+L+OKRVvmucRqUv8v2q5qIKfthPo7kONinzOhVW7wG6mZEY2/IaBzUh9bM9TZHq/STc
 nsgQ==
X-Gm-Message-State: ACrzQf0WXC+oHvQGeIYCv9Toxaw5gwX7K/uh08rOK5o4sfjzVts78sh2
 v7ytAcWf14qraC8Rksa8Btw=
X-Google-Smtp-Source: AMsMyM4tjxDH3I9/SGWnHbcfvNSs5puflv1f7cQrHpZ3l9cFk2LAz69U4h06qmIKaA9OS3B/R5EUpg==
X-Received: by 2002:aa7:9624:0:b0:56c:8c13:27bf with SMTP id
 r4-20020aa79624000000b0056c8c1327bfmr33745147pfg.20.1667531819540;
 Thu, 03 Nov 2022 20:16:59 -0700 (PDT)
Received: from dtor-ws.mtv.corp.google.com
 ([2620:15c:9d:2:a6ae:11ff:fe11:fcc3])
 by smtp.gmail.com with ESMTPSA id
 s3-20020a63ff43000000b004702eca61fcsm1078655pgk.36.2022.11.03.20.16.57
 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);
 Thu, 03 Nov 2022 20:16:58 -0700 (PDT)
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Helge Deller <deller@gmx.de>, Tony Lindgren <tony@atomide.com>,
 Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>,
 Sebastian Reichel <sre@kernel.org>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
 linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org
Subject: [PATCH RESEND 07/13] omapfb: panel-nec-nl8048hl11: switch to using
 gpiod API
Date: Thu,  3 Nov 2022 20:16:36 -0700
Message-Id: <20221103-omapfb-gpiod-v1-7-cba1fae5a77c@gmail.com>
X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog
In-Reply-To: <20221103-omapfb-gpiod-v1-0-cba1fae5a77c@gmail.com>
References: <20221103-omapfb-gpiod-v1-0-cba1fae5a77c@gmail.com>
MIME-Version: 1.0
X-Mailer: b4 0.11.0-dev-28747
Precedence: bulk
List-ID: <linux-omap.vger.kernel.org>
X-Mailing-List: linux-omap@vger.kernel.org

Switch the driver from legacy gpio API that is deprecated to the newer
gpiod API that respects line polarities described in ACPI/DT.

Note that because existing DTSes specify incorrect polarity of reset
lines (active high) and GPU drivers have adopted to this, we follow
the suit and use inverted values when controlling reset lines.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 .../omap2/omapfb/displays/panel-nec-nl8048hl11.c   | 72 ++++++----------------
 1 file changed, 20 insertions(+), 52 deletions(-)

diff --git a/drivers/video/fbdev/omap2/omapfb/displays/panel-nec-nl8048hl11.c b/drivers/video/fbdev/omap2/omapfb/displays/panel-nec-nl8048hl11.c
index b407173e27b1..33563953b2ff 100644
--- a/drivers/video/fbdev/omap2/omapfb/displays/panel-nec-nl8048hl11.c
+++ b/drivers/video/fbdev/omap2/omapfb/displays/panel-nec-nl8048hl11.c
@@ -7,12 +7,12 @@
  * Converted to new DSS device model: Tomi Valkeinen <tomi.valkeinen@ti.com>
  */
 
-#include <linux/module.h>
 #include <linux/delay.h>
-#include <linux/spi/spi.h>
+#include <linux/err.h>
 #include <linux/fb.h>
-#include <linux/gpio.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
 
 #include <video/omapfb_dss.h>
 
@@ -24,8 +24,7 @@ struct panel_drv_data {
 
 	int data_lines;
 
-	int res_gpio;
-	int qvga_gpio;
+	struct gpio_desc *res_gpio;
 
 	struct spi_device *spi;
 };
@@ -155,8 +154,8 @@ static int nec_8048_enable(struct omap_dss_device *dssdev)
 	if (r)
 		return r;
 
-	if (gpio_is_valid(ddata->res_gpio))
-		gpio_set_value_cansleep(ddata->res_gpio, 1);
+	/* Apparently existing DTSes use incorrect polarity (active high) */
+	gpiod_set_value_cansleep(ddata->res_gpio, 1);
 
 	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 
@@ -171,8 +170,8 @@ static void nec_8048_disable(struct omap_dss_device *dssdev)
 	if (!omapdss_device_is_enabled(dssdev))
 		return;
 
-	if (gpio_is_valid(ddata->res_gpio))
-		gpio_set_value_cansleep(ddata->res_gpio, 0);
+	/* Apparently existing DTSes use incorrect polarity (active high) */
+	gpiod_set_value_cansleep(ddata->res_gpio, 0);
 
 	in->ops.dpi->disable(in);
 
@@ -222,35 +221,6 @@ static struct omap_dss_driver nec_8048_ops = {
 	.get_resolution	= omapdss_default_get_resolution,
 };
 
-
-static int nec_8048_probe_of(struct spi_device *spi)
-{
-	struct device_node *node = spi->dev.of_node;
-	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
-	struct omap_dss_device *in;
-	int gpio;
-
-	gpio = of_get_named_gpio(node, "reset-gpios", 0);
-	if (!gpio_is_valid(gpio)) {
-		dev_err(&spi->dev, "failed to parse enable gpio\n");
-		return gpio;
-	}
-	ddata->res_gpio = gpio;
-
-	/* XXX the panel spec doesn't mention any QVGA pin?? */
-	ddata->qvga_gpio = -ENOENT;
-
-	in = omapdss_of_find_source_for_first_ep(node);
-	if (IS_ERR(in)) {
-		dev_err(&spi->dev, "failed to find video source\n");
-		return PTR_ERR(in);
-	}
-
-	ddata->in = in;
-
-	return 0;
-}
-
 static int nec_8048_probe(struct spi_device *spi)
 {
 	struct panel_drv_data *ddata;
@@ -281,24 +251,22 @@ static int nec_8048_probe(struct spi_device *spi)
 
 	ddata->spi = spi;
 
-	r = nec_8048_probe_of(spi);
-	if (r)
+	ddata->in = omapdss_of_find_source_for_first_ep(spi->dev.of_node);
+	r = PTR_ERR_OR_ZERO(ddata->in);
+	if (r) {
+		dev_err(&spi->dev, "failed to find video source: %d\n", r);
 		return r;
-
-	if (gpio_is_valid(ddata->qvga_gpio)) {
-		r = devm_gpio_request_one(&spi->dev, ddata->qvga_gpio,
-				GPIOF_OUT_INIT_HIGH, "lcd QVGA");
-		if (r)
-			goto err_gpio;
 	}
 
-	if (gpio_is_valid(ddata->res_gpio)) {
-		r = devm_gpio_request_one(&spi->dev, ddata->res_gpio,
-				GPIOF_OUT_INIT_LOW, "lcd RES");
-		if (r)
-			goto err_gpio;
+	ddata->res_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
+	r = PTR_ERR_OR_ZERO(ddata->res_gpio);
+	if (r) {
+		dev_err(&spi->dev, "failed to request reset gpio: %d\n", r);
+		goto err_gpio;
 	}
 
+	gpiod_set_consumer_name(ddata->res_gpio, "lcd RES");
+
 	ddata->videomode = nec_8048_panel_timings;
 
 	dssdev = &ddata->dssdev;