linux-kernel - [PATCH 2/3] pata_platform: Document `pio

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Date:   Sun, 21 Mar 2021 20:55:27 +0100 (CET)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     linux-ide@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
cc:     Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>
Subject: [PATCH 2/3] pata_platform: Document `pio_mask' module parameter

Add MODULE_PARM_DESC documentation and a kernel-parameters.txt entry.

Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
---
 Documentation/admin-guide/kernel-parameters.txt |    7 +++++++
 drivers/ata/pata_platform.c                     |    4 ++--
 2 files changed, 9 insertions(+), 2 deletions(-)

linux-pata-platform-parm-desc.diff
Index: linux-dolch/Documentation/admin-guide/kernel-parameters.txt
===================================================================
--- linux-dolch.orig/Documentation/admin-guide/kernel-parameters.txt
+++ linux-dolch/Documentation/admin-guide/kernel-parameters.txt
@@ -3640,6 +3640,13 @@
 			By default set to 1 if CONFIG_PATA_WINBOND_VLB_MODULE,
 			0 otherwise.
 
+	pata_platform.pio_mask=	[HW,LIBATA]
+			Format: <int>
+			Supported PIO mode mask.  Set individual bits to allow
+			the use of the respective PIO modes.  Bit 0 is for
+			mode 0, bit 1 is for mode 1, and so on.  Mode 0 only
+			allowed by default.
+
 	pause_on_oops=
 			Halt all CPUs after the first oops has been printed for
 			the specified number of seconds.  This is to be used if
Index: linux-dolch/drivers/ata/pata_platform.c
===================================================================
--- linux-dolch.orig/drivers/ata/pata_platform.c
+++ linux-dolch/drivers/ata/pata_platform.c
@@ -24,6 +24,8 @@
 #define DRV_VERSION "1.2"
 
 static int pio_mask = 1;
+module_param(pio_mask, int, 0);
+MODULE_PARM_DESC(pio_mask, "PIO modes supported, mode 0 only by default");
 
 /*
  * Provide our own set_mode() as we don't want to change anything that has
@@ -233,8 +235,6 @@ static struct platform_driver pata_platf
 
 module_platform_driver(pata_platform_driver);
 
-module_param(pio_mask, int, 0);
-
 MODULE_AUTHOR("Paul Mundt");
 MODULE_DESCRIPTION("low-level driver for platform device ATA");
 MODULE_LICENSE("GPL");