linux-kernel - [PATCH 1/5] mmc: mtk-sd: support "voltage-ranges" setting.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 16 Apr 2019 14:47:29 +1000
From:   NeilBrown <neil@...wn.name>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Chaotian Jing <chaotian.jing@...iatek.com>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        thirtythreeforty@...il.com
Subject: [PATCH 1/5] mmc: mtk-sd: support "voltage-ranges" setting.

If the mtk-sd silicon is used in a context where there is no explicit
regulator, it is not currently possible to specify the voltage
ranges.  This is true for the MT7621 MIPS Soc.

So add a called to mmc_of_parse_voltage() so that voltage-ranges can
be given.

Signed-off-by: NeilBrown <neil@...wn.name>
---
 Documentation/devicetree/bindings/mmc/mtk-sd.txt |    6 ++++--
 drivers/mmc/host/mtk-sd.c                        |    3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.txt b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
index f5bcda3980cc..ed61cd5a5b8f 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.txt
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
@@ -27,10 +27,12 @@ Required properties:
 - pinctrl-names: should be "default", "state_uhs"
 - pinctrl-0: should contain default/high speed pin ctrl
 - pinctrl-1: should contain uhs mode pin ctrl
-- vmmc-supply: power to the Core
-- vqmmc-supply: power to the IO
 
 Optional properties:
+- vmmc-supply: power to the Core
+- vqmmc-supply: power to the IO
+- voltage-ranges: if vmmc-supply not present, this can specify pairs
+	of millivolt numbers to describe available ranged.
 - assigned-clocks: PLL of the source clock
 - assigned-clock-parents: parent of source clock, used for HS400 mode to get 400Mhz source clock
 - hs400-ds-delay: HS400 DS delay setting
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 0798f0ba6d34..4492a4465c0e 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2125,6 +2125,9 @@ static int msdc_drv_probe(struct platform_device *pdev)
 	ret = mmc_of_parse(mmc);
 	if (ret)
 		goto host_free;
+	ret = mmc_of_parse_voltage(pdev->dev.of_node, &mmc->ocr_avail);
+	if (ret < 0)
+		goto host_free;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	host->base = devm_ioremap_resource(&pdev->dev, res);