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Fri, 24 Nov 2023 12:41:46 +0300 (MSK) Received: from localhost (100.64.160.123) by p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Fri, 24 Nov 2023 12:41:46 +0300 Date: Fri, 24 Nov 2023 12:41:46 +0300 From: Dmitry Rokosov To: Lee Jones CC: , , , , , , , , , , George Stark Subject: Re: [PATCH v4 04/11] leds: aw200xx: calculate dts property display_rows in the driver Message-ID: <20231124094146.qsgmmbwulemjikpg@CAB-WSD-L081021> References: <20231121202835.28152-1-ddrokosov@salutedevices.com> <20231121202835.28152-5-ddrokosov@salutedevices.com> <20231123163252.GF1354538@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20231123163252.GF1354538@google.com> User-Agent: NeoMutt/20220415 X-Originating-IP: [100.64.160.123] X-ClientProxiedBy: p-i-exch-sc-m02.sberdevices.ru (172.16.192.103) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 181570 [Nov 24 2023] X-KSMG-AntiSpam-Version: 6.0.0.2 X-KSMG-AntiSpam-Envelope-From: ddrokosov@salutedevices.com X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 4 0.3.4 720d3c21819df9b72e78f051e300e232316d302a, {Tracking_from_domain_doesnt_match_to}, 100.64.160.123:7.1.2;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;salutedevices.com:7.1.1;p-i-exch-sc-m01.sberdevices.ru:7.1.1,5.0.1;127.0.0.199:7.1.2, FromAlignment: s, {Track_Chinese_Simplified, text}, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/11/24 06:01:00 #22520095 X-KSMG-AntiVirus-Status: Clean, skipped X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Fri, 24 Nov 2023 01:42:17 -0800 (PST) On Thu, Nov 23, 2023 at 04:32:52PM +0000, Lee Jones wrote: > On Tue, 21 Nov 2023, Dmitry Rokosov wrote: > > > From: George Stark > > > > Get rid of device tree property "awinic,display-rows". The property > > value actually means number of current switches and depends on how leds > > Nit: LEDs > > > are connected to the device. It should be calculated manually by max > > used led number. In the same way it is computed automatically now. > > As above - I won't mention this again. > > > Max used led is taken from led definition subnodes. > > > > Signed-off-by: George Stark > > Signed-off-by: Dmitry Rokosov > > --- > > drivers/leds/leds-aw200xx.c | 39 +++++++++++++++++++++++++------------ > > 1 file changed, 27 insertions(+), 12 deletions(-) > > > > diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c > > index 7762b3a132ac..4bce5e7381c0 100644 > > --- a/drivers/leds/leds-aw200xx.c > > +++ b/drivers/leds/leds-aw200xx.c > > @@ -379,6 +379,30 @@ static void aw200xx_disable(const struct aw200xx *const chip) > > return gpiod_set_value_cansleep(chip->hwen, 0); > > } > > > > +static bool aw200xx_probe_get_display_rows(struct device *dev, struct aw200xx *chip) > > +{ > > + struct fwnode_handle *child; > > + u32 max_source = 0; > > + > > + device_for_each_child_node(dev, child) { > > + u32 source; > > + int ret; > > + > > + ret = fwnode_property_read_u32(child, "reg", &source); > > + if (ret || source >= chip->cdef->channels) > > Shouldn't the second clause fail instantly? > We already have such logic in the aw200xx_probe_fw() function, which skips the LED node with the wrong reg value too. Furthermore, we have strict reg constraints in the dt-bindings parts (in the current patch series), so we assume that the DT developer will not create an LED with the wrong reg value. > > + continue; > > + > > + max_source = max(max_source, source); > > + } > > + > > + if (!max_source) > > Since max_source is an integer, please use an '== 0' comparison. > Okay > > + return false; > > + > > + chip->display_rows = max_source / chip->cdef->display_size_columns + 1; > > + > > + return true; > > +} > > + > > static int aw200xx_probe_fw(struct device *dev, struct aw200xx *chip) > > { > > struct fwnode_handle *child; > > @@ -386,18 +410,9 @@ static int aw200xx_probe_fw(struct device *dev, struct aw200xx *chip) > > int ret; > > int i; > > > > - ret = device_property_read_u32(dev, "awinic,display-rows", > > - &chip->display_rows); > > - if (ret) > > - return dev_err_probe(dev, ret, > > - "Failed to read 'display-rows' property\n"); > > - > > - if (!chip->display_rows || > > - chip->display_rows > chip->cdef->display_size_rows_max) { > > - return dev_err_probe(dev, ret, > > - "Invalid leds display size %u\n", > > - chip->display_rows); > > - } > > + if (!aw200xx_probe_get_display_rows(dev, chip)) > > Function calls in side if() statements in general is rough. > > Please break it out and use 'ret' as we usually do. > > > + return dev_err_probe(dev, -EINVAL, > > Make this the return value from aw200xx_probe_get_display_rows() and use > 'ret' instead. > No problem, I'll prepare a new version. > > + "No valid led definitions found\n"); > > > > current_max = aw200xx_imax_from_global(chip, AW200XX_IMAX_MAX_uA); > > current_min = aw200xx_imax_from_global(chip, AW200XX_IMAX_MIN_uA); > > -- > > 2.36.0 > > > > -- > Lee Jones [李琼斯] -- Thank you, Dmitry