From 18a8dd081b8161d3421a4ebaea3b3bd9f8631b05 Mon Sep 17 00:00:00 2001 From: Marijn Suijten Date: Mon, 15 Nov 2021 21:34:55 +0100 Subject: [PATCH] backlight: qcom-wled: Override default length with qcom,enabled-strings [ Upstream commit 2b4b49602f9feca7b7a84eaa33ad9e666c8aa695 ] The length of qcom,enabled-strings as property array is enough to determine the number of strings to be enabled, without needing to set qcom,num-strings to override the default number of strings when less than the default (which is also the maximum) is provided in DT. This also introduces an extra warning when qcom,num-strings is set, denoting that it is not necessary to set both anymore. It is usually more concise to set just qcom,num-length when a zero-based, contiguous range of strings is needed (the majority of the cases), or to only set qcom,enabled-strings when a specific set of indices is desired. Fixes: 775d2ffb4af6 ("backlight: qcom-wled: Restructure the driver for WLED3") Signed-off-by: Marijn Suijten Reviewed-by: AngeloGioacchino Del Regno Reviewed-by: Daniel Thompson Signed-off-by: Lee Jones Link: https://lore.kernel.org/r/20211115203459.1634079-6-marijn.suijten@somainline.org Signed-off-by: Sasha Levin --- drivers/video/backlight/qcom-wled.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index dbcbeda..c057368 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -1521,6 +1521,8 @@ static int wled_configure(struct wled *wled) return -EINVAL; } } + + cfg->num_strings = string_len; } rc = of_property_read_u32(dev->of_node, "qcom,num-strings", &val); @@ -1531,9 +1533,13 @@ static int wled_configure(struct wled *wled) return -EINVAL; } - if (string_len > 0 && val > string_len) { - dev_err(dev, "qcom,num-strings exceeds qcom,enabled-strings\n"); - return -EINVAL; + if (string_len > 0) { + dev_warn(dev, "Only one of qcom,num-strings or qcom,enabled-strings" + " should be set\n"); + if (val > string_len) { + dev_err(dev, "qcom,num-strings exceeds qcom,enabled-strings\n"); + return -EINVAL; + } } cfg->num_strings = val; -- 2.7.4