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Sat, 11 Oct 2025 05:16:18 -0700 (PDT) Message-ID: <6f6fbebf-bdb6-402d-8aa1-9f33eae914ed@gmail.com> Date: Sat, 11 Oct 2025 14:16:16 +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 , Lee Jones , Pavel Machek Cc: Christian Hitz , stable@vger.kernel.org, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251008123222.1117331-1-christian@klarinett.li> Content-Language: en-US From: Jacek Anaszewski In-Reply-To: <20251008123222.1117331-1-christian@klarinett.li> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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. > > led_config_lo = bank_enable_mask; > led_config_hi = bank_enable_mask >> 8; > @@ -405,7 +403,7 @@ static int lp50xx_probe_leds(struct fwnode_handle *child, struct lp50xx *priv, > return ret; > } > > - ret = lp50xx_set_banks(priv, led_banks); > + ret = lp50xx_set_banks(priv, led_banks, num_leds); > if (ret) { > dev_err(priv->dev, "Cannot setup banked LEDs\n"); > return ret; Reviewed-by: Jacek Anaszewski -- Best regards, Jacek Anaszewski