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Date:   Thu, 21 Dec 2017 11:13:59 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, nsekhar@...com
Subject: Re: [PATCH 08/12] mmc: sdhci-omap: Add support to override f_max and
 iodelay from pdata

On 14/12/17 15:09, Kishon Vijay Abraham I wrote:
> DRA74x EVM Rev H EVM comes with revision 2.0 silicon. However, earlier
> versions of EVM can come with either revision 1.1 or revision 1.0 of
> silicon.
> 
> The device-tree file is written to support rev 2.0 of silicon.
> pdata-quirks are used to then override the settings needed for
> PG 1.1 silicon.
> 
> PG 1.1 silicon has limitations w.r.t frequencies at which MMC1/2/3
> can operate as well as different IOdelay numbers.
> 
> Add support in sdhci-omap driver to get platform data if available
> (added using pdata quirks) and override the data (max-frequency and
> iodelay data) obtained from device tree.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/mmc/host/sdhci-omap.c            | 17 ++++++++++++++++
>  include/linux/platform_data/sdhci-omap.h | 35 ++++++++++++++++++++++++++++++++
>  2 files changed, 52 insertions(+)
>  create mode 100644 include/linux/platform_data/sdhci-omap.h
> 
> diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
> index 6dee275b2e57..cddc3ad1331f 100644
> --- a/drivers/mmc/host/sdhci-omap.c
> +++ b/drivers/mmc/host/sdhci-omap.c
> @@ -22,6 +22,7 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> +#include <linux/platform_data/sdhci-omap.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/regulator/consumer.h>
> @@ -102,6 +103,7 @@ struct sdhci_omap_data {
>  };
>  
>  struct sdhci_omap_host {
> +	char			*version;
>  	void __iomem		*base;
>  	struct device		*dev;
>  	struct	regulator	*pbias;
> @@ -781,11 +783,18 @@ static struct pinctrl_state
>  				  u32 *caps, u32 capmask)
>  {
>  	struct device *dev = omap_host->dev;
> +	char *version = omap_host->version;
>  	struct pinctrl_state *pinctrl_state = ERR_PTR(-ENODEV);
> +	char str[20];
>  
>  	if (!(*caps & capmask))
>  		goto ret;
>  
> +	if (version) {
> +		sprintf(str, "%s-%s", mode, version);

snprintf please

> +		pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, str);

Doesn't look like this 'pinctrl_state' is used?

> +	}
> +
>  	pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, mode);
>  	if (IS_ERR(pinctrl_state)) {
>  		dev_err(dev, "no pinctrl state for %s mode", mode);
> @@ -879,6 +888,7 @@ static int sdhci_omap_probe(struct platform_device *pdev)
>  	struct mmc_host *mmc;
>  	const struct of_device_id *match;
>  	struct sdhci_omap_data *data;
> +	struct sdhci_omap_platform_data *platform_data;
>  
>  	match = of_match_device(omap_sdhci_match, dev);
>  	if (!match)
> @@ -913,6 +923,13 @@ static int sdhci_omap_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_pltfm_free;
>  
> +	platform_data = dev_get_platdata(dev);
> +	if (platform_data) {
> +		omap_host->version = platform_data->version;
> +		if (platform_data->max_freq)
> +			mmc->f_max = platform_data->max_freq;
> +	}
> +
>  	pltfm_host->clk = devm_clk_get(dev, "fck");
>  	if (IS_ERR(pltfm_host->clk)) {
>  		ret = PTR_ERR(pltfm_host->clk);
> diff --git a/include/linux/platform_data/sdhci-omap.h b/include/linux/platform_data/sdhci-omap.h
> new file mode 100644
> index 000000000000..a46e1240956a
> --- /dev/null
> +++ b/include/linux/platform_data/sdhci-omap.h
> @@ -0,0 +1,35 @@
> +/**
> + * SDHCI Controller Platform Data for TI's OMAP SoCs
> + *
> + * Copyright (C) 2017 Texas Instruments
> + * Author: Kishon Vijay Abraham I <kishon@...com>
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 of
> + * the License as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +#ifndef __SDHCI_OMAP_PDATA_H__
> +#define __SDHCI_OMAP_PDATA_H__
> +
> +struct sdhci_omap_platform_data {
> +	const char *name;
> +
> +	/*
> +	 * set if your board has components or wiring that limits the
> +	 * maximum frequency on the MMC bus
> +	 */
> +	unsigned int max_freq;
> +
> +	/* string specifying a particular variant of hardware */
> +	char *version;
> +};
> +
> +#endif
> 

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