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Wed, 26 Nov 2025 08:00:29 -0800 (PST) From: Nam Tran To: lee@kernel.org Cc: gregkh@linuxfoundation.org, pavel@kernel.org, rdunlap@infradead.org, christophe.jaillet@wanadoo.fr, krzk+dt@kernel.org, robh@kernel.org, conor+dt@kernel.org, corbet@lwn.net, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH v18 2/3] leds: add basic support for TI/National Semiconductor LP5812 LED Driver Date: Wed, 26 Nov 2025 23:00:24 +0700 Message-Id: <20251126160024.141129-1-trannamatk@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20251125134836.GC1127788@google.com> References: <20251125134836.GC1127788@google.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Tue, 25 Nov 2025, Lee Jones wrote: > > +static ssize_t parse_drive_mode(struct lp5812_chip *chip, const char *str) > > +{ > > + int i; > > + > > + chip->u_drive_mode.s_drive_mode.mix_sel_led_0 = false; > > + chip->u_drive_mode.s_drive_mode.mix_sel_led_1 = false; > > + chip->u_drive_mode.s_drive_mode.mix_sel_led_2 = false; > > + chip->u_drive_mode.s_drive_mode.mix_sel_led_3 = false; > > + > > + if (sysfs_streq(str, LP5812_MODE_DIRECT_NAME)) { > > + chip->u_drive_mode.s_drive_mode.led_mode = LP5812_MODE_DIRECT_VALUE; > > + return 0; > > + } > > + > > + for (i = 0; i < ARRAY_SIZE(chip_mode_map); i++) { > > + if (!sysfs_streq(str, chip_mode_map[i].mode_name)) > > + continue; > > + > > + chip->u_drive_mode.s_drive_mode.led_mode = chip_mode_map[i].mode; > > + chip->u_scan_order.s_scan_order.scan_order_0 = chip_mode_map[i].scan_order_0; > > + chip->u_scan_order.s_scan_order.scan_order_1 = chip_mode_map[i].scan_order_1; > > + chip->u_scan_order.s_scan_order.scan_order_2 = chip_mode_map[i].scan_order_2; > > + chip->u_scan_order.s_scan_order.scan_order_3 = chip_mode_map[i].scan_order_3; > > Where are all of these used? These fields are part of unions (u_drive_mode and u_scan_order). The bitfields are packed into drive_mode_val and scan_order_val, which are written to DEV_CONFIG1 and DEV_CONFIG2 in lp5812_set_drive_mode_scan_order(). > [...] > > > +union u_scan_order { > > What is 'u'? The u_* and s_* prefixes were originally meant to indicate union/struct, but they are not idiomatic. I will rename it to union lp5812_scan_order { struct { u8 order0:2; u8 order1:2; u8 order2:2; u8 order3:2; } bits; u8 val; }; and do the same for u_drive_mode. Thanks for reviewing. Best regards, Nam Tran