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(https://www.jedec.org/standards-documents/docs/jesd300-5b01). Acked-by: Krzysztof Kozlowski Signed-off-by: Guenter Roeck --- v4: Add Krzysztof's Acked-by: v3: Drop explicit bindings file; add binding to trivial devices instead Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml index 0a419453d183..1d19e67de2a1 100644 --- a/Documentation/devicetree/bindings/trivial-devices.yaml +++ b/Documentation/devicetree/bindings/trivial-devices.yaml @@ -168,6 +168,8 @@ properties: - isil,isl69269 # Intersil ISL76682 Ambient Light Sensor - isil,isl76682 + # JEDEC JESD300 (SPD5118) Hub and Serial Presence Detect + - jedec,spd5118 # Linear Technology LTC2488 - lineartechnology,ltc2488 # 5 Bit Programmable, Pulse-Width Modulator From patchwork Tue Jun 4 04:02:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 801475 Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C768013DDD3; 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Mon, 03 Jun 2024 21:02:46 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f63235e06asm72615195ad.81.2024.06.03.21.02.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Jun 2024 21:02:45 -0700 (PDT) Sender: Guenter Roeck From: Guenter Roeck To: linux-hwmon@vger.kernel.org Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Krzysztof Kozlowski , Wolfram Sang , =?utf-8?q?Ren=C3=A9_Rebe?= , =?utf-8?q?Thomas_Wei=C3=9Fs?= =?utf-8?q?chuh?= , Armin Wolf , Stephen Horvath , Guenter Roeck Subject: [PATCH v4 3/6] hwmon: (spd5118) Add suspend/resume support Date: Mon, 3 Jun 2024 21:02:34 -0700 Message-Id: <20240604040237.1064024-4-linux@roeck-us.net> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240604040237.1064024-1-linux@roeck-us.net> References: <20240604040237.1064024-1-linux@roeck-us.net> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add suspend/resume support to ensure that limit and configuration registers are updated and synchronized after a suspend/resume cycle. Cc: Armin Wolf Cc: Stephen Horvath Signed-off-by: Guenter Roeck Tested-by: Armin Wolf --- v4: Fix bug seen if the enable attribute was never read prior to a suspend/resume cycle. v3: No change v2: New patch drivers/hwmon/spd5118.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/drivers/hwmon/spd5118.c b/drivers/hwmon/spd5118.c index d3fc0ae17743..d55c073ff5fd 100644 --- a/drivers/hwmon/spd5118.c +++ b/drivers/hwmon/spd5118.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -432,6 +433,8 @@ static int spd5118_probe(struct i2c_client *client) if (!spd5118_vendor_valid(bank, vendor)) return -ENODEV; + dev_set_drvdata(dev, regmap); + hwmon_dev = devm_hwmon_device_register_with_info(dev, "spd5118", regmap, &spd5118_chip_info, NULL); @@ -449,6 +452,41 @@ static int spd5118_probe(struct i2c_client *client) return 0; } +static int spd5118_suspend(struct device *dev) +{ + struct regmap *regmap = dev_get_drvdata(dev); + u32 regval; + int err; + + /* + * Make sure the configuration register in the regmap cache is current + * before bypassing it. + */ + err = regmap_read(regmap, SPD5118_REG_TEMP_CONFIG, ®val); + if (err < 0) + return err; + + regcache_cache_bypass(regmap, true); + regmap_update_bits(regmap, SPD5118_REG_TEMP_CONFIG, SPD5118_TS_DISABLE, + SPD5118_TS_DISABLE); + regcache_cache_bypass(regmap, false); + + regcache_cache_only(regmap, true); + regcache_mark_dirty(regmap); + + return 0; +} + +static int spd5118_resume(struct device *dev) +{ + struct regmap *regmap = dev_get_drvdata(dev); + + regcache_cache_only(regmap, false); + return regcache_sync(regmap); +} + +static DEFINE_SIMPLE_DEV_PM_OPS(spd5118_pm_ops, spd5118_suspend, spd5118_resume); + static const struct i2c_device_id spd5118_id[] = { { "spd5118", 0 }, { } @@ -466,6 +504,7 @@ static struct i2c_driver spd5118_driver = { .driver = { .name = "spd5118", .of_match_table = spd5118_of_ids, + .pm = pm_sleep_ptr(&spd5118_pm_ops), }, .probe = spd5118_probe, .id_table = spd5118_id, From patchwork Tue Jun 4 04:02:36 2024 Content-Type: text/plain; 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Suggested-by: Thomas Weißschuh Cc: Wolfram Sang Signed-off-by: Guenter Roeck Reviewed-by: Armin Wolf --- v5: New patch drivers/i2c/i2c-smbus.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c index 97f338b123b1..8a0dab835761 100644 --- a/drivers/i2c/i2c-smbus.c +++ b/drivers/i2c/i2c-smbus.c @@ -382,6 +382,10 @@ void i2c_register_spd(struct i2c_adapter *adap) case 0x1E: /* LPDDR4 */ name = "ee1004"; break; + case 0x22: /* DDR5 */ + case 0x23: /* LPDDR5 */ + name = "spd5118"; + break; default: dev_info(&adap->dev, "Memory type 0x%02x not supported yet, not instantiating SPD\n",