From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans de Goede Subject: [PATCH resend] mmc: pwrseq-simple: Add an optional post-power-on-delay Date: Sun, 7 Aug 2016 21:02:38 +0200 Message-ID: <1470596558-23195-2-git-send-email-hdegoede@redhat.com> References: <1470596558-23195-1-git-send-email-hdegoede@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1470596558-23195-1-git-send-email-hdegoede@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Ulf Hansson , Rob Herring Cc: devicetree , linux-mmc@vger.kernel.org, Hans de Goede , Chen-Yu Tsai , Icenowy Zheng , Maxime Ripard , linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org Some devices need a while to boot their firmware after providing clks / de-asserting resets before they are ready to receive sdio commands. This commits adds a post-power-on-delay-ms devicetree property to mmc-pwrseq-simple for use with such devices. Signed-off-by: Hans de Goede --- Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt | 2 ++ drivers/mmc/core/pwrseq_simple.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt index ce0e767..e254368 100644 --- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt +++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt @@ -16,6 +16,8 @@ Optional properties: See ../clocks/clock-bindings.txt for details. - clock-names : Must include the following entry: "ext_clock" (External clock provided to the card). +- post-power-on-delay-ms : Delay in ms after powering the card and + de-asserting the reset-gpios (if any) Example: diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c index 450d907..1304160 100644 --- a/drivers/mmc/core/pwrseq_simple.c +++ b/drivers/mmc/core/pwrseq_simple.c @@ -16,6 +16,8 @@ #include #include #include +#include +#include #include @@ -24,6 +26,7 @@ struct mmc_pwrseq_simple { struct mmc_pwrseq pwrseq; bool clk_enabled; + u32 post_power_on_delay_ms; struct clk *ext_clk; struct gpio_descs *reset_gpios; }; @@ -64,6 +67,9 @@ static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host) struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq); mmc_pwrseq_simple_set_gpios_value(pwrseq, 0); + + if (pwrseq->post_power_on_delay_ms) + msleep(pwrseq->post_power_on_delay_ms); } static void mmc_pwrseq_simple_power_off(struct mmc_host *host) @@ -111,6 +117,9 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev) return PTR_ERR(pwrseq->reset_gpios); } + device_property_read_u32(dev, "post-power-on-delay-ms", + &pwrseq->post_power_on_delay_ms); + pwrseq->pwrseq.dev = dev; pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops; pwrseq->pwrseq.owner = THIS_MODULE; -- 2.7.4