From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: Re: [PATCH 3/3] mmc: sdhci-sprd: Add pin control support for voltage switch Date: Mon, 1 Jul 2019 16:31:25 +0300 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: Baolin Wang , ulf.hansson@linaro.org, zhang.lyra@gmail.com, orsonzhai@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com Cc: vincent.guittot@linaro.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org On 21/06/19 9:12 AM, Baolin Wang wrote: > For Spreadtrum SD card voltage switching, besides regulator setting, > it also need switch related pin's state to output corresponding voltage. > > This patch adds pin control operation to support voltage switch. > > Signed-off-by: Baolin Wang Acked-by: Adrian Hunter > --- > drivers/mmc/host/sdhci-sprd.c | 54 +++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 54 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c > index 8b23c88..6ee340a 100644 > --- a/drivers/mmc/host/sdhci-sprd.c > +++ b/drivers/mmc/host/sdhci-sprd.c > @@ -12,6 +12,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -72,6 +73,9 @@ struct sdhci_sprd_host { > struct clk *clk_sdio; > struct clk *clk_enable; > struct clk *clk_2x_enable; > + struct pinctrl *pinctrl; > + struct pinctrl_state *pins_uhs; > + struct pinctrl_state *pins_default; > u32 base_rate; > int flags; /* backup of host attribute */ > u32 phy_delay[MMC_TIMING_MMC_HS400 + 2]; > @@ -405,6 +409,8 @@ static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq) > > static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) > { > + struct sdhci_host *host = mmc_priv(mmc); > + struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host); > int ret; > > if (!IS_ERR(mmc->supply.vqmmc)) { > @@ -416,6 +422,37 @@ static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) > } > } > > + if (IS_ERR(sprd_host->pinctrl)) > + return 0; > + > + switch (ios->signal_voltage) { > + case MMC_SIGNAL_VOLTAGE_180: > + ret = pinctrl_select_state(sprd_host->pinctrl, > + sprd_host->pins_uhs); > + if (ret) { > + pr_err("%s: failed to select uhs pin state\n", > + mmc_hostname(mmc)); > + return ret; > + } > + break; > + > + default: > + /* fall-through */ > + case MMC_SIGNAL_VOLTAGE_330: > + ret = pinctrl_select_state(sprd_host->pinctrl, > + sprd_host->pins_default); > + if (ret) { > + pr_err("%s: failed to select default pin state\n", > + mmc_hostname(mmc)); > + return ret; > + } > + break; > + } > + > + /* Wait for 300 ~ 500 us for pin state stable */ > + usleep_range(300, 500); > + sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); > + > return 0; > } > > @@ -504,6 +541,23 @@ static int sdhci_sprd_probe(struct platform_device *pdev) > sprd_host = TO_SPRD_HOST(host); > sdhci_sprd_phy_param_parse(sprd_host, pdev->dev.of_node); > > + sprd_host->pinctrl = devm_pinctrl_get(&pdev->dev); > + if (!IS_ERR(sprd_host->pinctrl)) { > + sprd_host->pins_uhs = > + pinctrl_lookup_state(sprd_host->pinctrl, "state_uhs"); > + if (IS_ERR(sprd_host->pins_uhs)) { > + ret = PTR_ERR(sprd_host->pins_uhs); > + goto pltfm_free; > + } > + > + sprd_host->pins_default = > + pinctrl_lookup_state(sprd_host->pinctrl, "default"); > + if (IS_ERR(sprd_host->pins_default)) { > + ret = PTR_ERR(sprd_host->pins_default); > + goto pltfm_free; > + } > + } > + > clk = devm_clk_get(&pdev->dev, "sdio"); > if (IS_ERR(clk)) { > ret = PTR_ERR(clk); >