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Mon, 13 Oct 2025 10:35:44 -0700 (PDT) Message-ID: Date: Mon, 13 Oct 2025 19:35:40 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] leds: leds-lp50xx: allow LED 0 to be added to module bank To: Christian Hitz Cc: Lee Jones , Pavel Machek , Christian Hitz , stable@vger.kernel.org, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251013085514.512508-1-christian@klarinett.li> Content-Language: en-US From: Jacek Anaszewski In-Reply-To: <20251013085514.512508-1-christian@klarinett.li> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/13/25 10:54, Christian Hitz wrote: > On Sat, 11 Oct 2025 14:16:16 +0200 Jacek Anaszewski wrote: > >> Hi Christian, >> >> On 10/8/25 14:32, Christian Hitz wrote: >>> From: Christian Hitz >>> >>> led_banks contains LED module number(s) that should be grouped into the >>> module bank. led_banks is 0-initialized. >>> By checking the led_banks entries for 0, un-set entries are detected. >>> But a 0-entry also indicates that LED module 0 should be grouped into the >>> module bank. >>> >>> By only iterating over the available entries no check for unused entries >>> is required and LED module 0 can be added to bank. >>> >>> Signed-off-by: Christian Hitz >>> Cc: stable@vger.kernel.org >>> --- >>> drivers/leds/leds-lp50xx.c | 10 ++++------ >>> 1 file changed, 4 insertions(+), 6 deletions(-) >>> >>> diff --git a/drivers/leds/leds-lp50xx.c b/drivers/leds/leds-lp50xx.c >>> index 94f8ef6b482c..d50c7f3e8f99 100644 >>> --- a/drivers/leds/leds-lp50xx.c >>> +++ b/drivers/leds/leds-lp50xx.c >>> @@ -341,17 +341,15 @@ static int lp50xx_brightness_set(struct led_classdev *cdev, >>> return ret; >>> } >>> >>> -static int lp50xx_set_banks(struct lp50xx *priv, u32 led_banks[]) >>> +static int lp50xx_set_banks(struct lp50xx *priv, u32 led_banks[], int num_leds) >>> { >>> u8 led_config_lo, led_config_hi; >>> u32 bank_enable_mask = 0; >>> int ret; >>> int i; >>> >>> - for (i = 0; i < priv->chip_info->max_modules; i++) { >>> - if (led_banks[i]) >>> - bank_enable_mask |= (1 << led_banks[i]); >>> - } >>> + for (i = 0; i < num_leds; i++) >>> + bank_enable_mask |= (1 << led_banks[i]); >> >> Probably the first idea was to have a bitmask indicating which bank >> to enable, but it ended up in having array of bank ids in DT with no >> related adjustment in the driver. >> >> This patch deserves Fixes tag. > > This code has not changed since the inital introduction of this driver. Yeah, I had on mind design approach changes between subsequent versions of the patch that was adding the driver. > Fixes: 242b81170fb8 ("leds: lp50xx: Add the LP50XX family of the RGB LED driver") -- Best regards, Jacek Anaszewski