linux-kernel - [PATCH] hte: tegra194: improve the GPIO-related comment

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 11 Sep 2023 11:44:43 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Dipen Patel <dipenp@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     timestamp@...ts.linux.dev, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] hte: tegra194: improve the GPIO-related comment

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Using any of the GPIO interfaces using the global numberspace is
deprecated. Make it clear in the comment.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
---
This was part of a wider series but since this is independent, I'm sending
it separately.

 drivers/hte/hte-tegra194.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/hte/hte-tegra194.c b/drivers/hte/hte-tegra194.c
index 6fe6897047ac..9fd3c00ff695 100644
--- a/drivers/hte/hte-tegra194.c
+++ b/drivers/hte/hte-tegra194.c
@@ -407,12 +407,15 @@ static int tegra_hte_line_xlate(struct hte_chip *gc,
 		return -EINVAL;
 
 	/*
+	 * GPIO consumers can access GPIOs in two ways:
 	 *
-	 * There are two paths GPIO consumers can take as follows:
-	 * 1) The consumer (gpiolib-cdev for example) which uses GPIO global
-	 * number which gets assigned run time.
-	 * 2) The consumer passing GPIO from the DT which is assigned
-	 * statically for example by using TEGRA194_AON_GPIO gpio DT binding.
+	 * 1) Using the global GPIO numberspace.
+	 *
+	 * This is the old, now DEPRECATED method and should not be used in
+	 * new code. TODO: Check if tegra is even concerned by this.
+	 *
+	 * 2) Using GPIO descriptors that can be assigned to consumer devices
+	 * using device-tree, ACPI or lookup tables.
 	 *
 	 * The code below addresses both the consumer use cases and maps into
 	 * HTE/GTE namespace.
-- 
2.39.2