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Message-ID: <53B3DE4F.1040100@ti.com>
Date: Wed, 2 Jul 2014 15:56:23 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Lee Jones <lee.jones@...aro.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: <kernel@...inux.com>
Subject: Re: [PATCH v2 4/5] phy: miphy365x: Represent each PHY channel as
a subnode
Hi,
On Monday 30 June 2014 08:11 PM, Lee Jones wrote:
> phy: miphy365x: Represent each PHY channel as a DT subnode
>
> This has the added advantages of being able to enable/disable each
> of the channels as simply as enabling/disabling the DT node.
>
> Suggested-by: Kishon Vijay Abraham I <kishon@...com>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
>
> diff --git a/drivers/phy/phy-miphy365x.c b/drivers/phy/phy-miphy365x.c
> index 1109f42..2c4ea6e 100644
> --- a/drivers/phy/phy-miphy365x.c
> +++ b/drivers/phy/phy-miphy365x.c
> @@ -17,6 +17,7 @@
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/of_platform.h>
> +#include <linux/of_address.h>
> #include <linux/clk.h>
> #include <linux/phy/phy.h>
> #include <linux/delay.h>
> @@ -144,6 +145,7 @@ struct miphy365x {
> void __iomem *pcie;
> u8 type;
> u8 port;
> + bool enabled;
> };
>
> struct miphy365x_dev {
> @@ -468,7 +470,7 @@ static struct phy *miphy365x_xlate(struct device *dev,
> struct miphy365x_dev *state = dev_get_drvdata(dev);
> u8 port, type;
>
> - if (args->count != 2) {
> + if (args->args_count != 2) {
> dev_err(dev, "Invalid number of cells in 'phy' property\n");
> return ERR_PTR(-EINVAL);
> }
> @@ -484,6 +486,11 @@ static struct phy *miphy365x_xlate(struct device *dev,
> if (WARN_ON(port >= ARRAY_SIZE(ports)))
> return ERR_PTR(-EINVAL);
>
> + if (!state->phys[port].enabled) {
> + dev_warn(dev, "PHY port %d is disabled\n", port);
> + return ERR_PTR(-EINVAL);
> + }
> +
> if (type == MIPHY_TYPE_SATA)
> state->phys[port].base = state->phys[port].sata;
> else if (type == MIPHY_TYPE_PCIE)
> @@ -503,38 +510,75 @@ static struct phy_ops miphy365x_ops = {
> .owner = THIS_MODULE,
> };
>
> -static int miphy365x_get_base_addr(struct platform_device *pdev,
> - struct miphy365x_phy *phy, u8 port)
> +static int miphy365x_get_base_addr_one(struct platform_device *pdev,
> + struct miphy365x *phy,
> + struct device_node *child,
> + int index)
> {
> - struct resource *res;
> - char type[6];
> + void __iomem *base;
> + const char *name;
> + int ret;
>
> - sprintf(type, "sata%d", port);
> + base = of_iomap(child, index);
> + if (!base) {
> + dev_err(&pdev->dev, "Failed to map %s\n", child->full_name);
> + return -EINVAL;
> + }
>
> - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, type);
> - if (!res)
> - return -ENODEV;
> + ret = of_property_read_string_index(child, "reg-names", index, &name);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "%s: no reg-names property not found\n", child->name);
> + return ret;
> + }
>
> - phy->sata = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> - if (!phy->sata)
> - return -ENOMEM;
> + if (!strncmp(name, "sata", 4))
> + phy->sata = base;
> + else if (!strncmp(name, "pcie", 4))
> + phy->pcie = base;
> + else {
> + dev_err(&pdev->dev, "reg-names in %s not sata or pcie: %s",
> + child->name, name);
> + return -EINVAL;
> + }
>
> - sprintf(type, "pcie%d", port);
> + return 0;
> +}
>
> - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, type);
> - if (!res)
> - return -ENODEV;
> +static int miphy365x_get_base_addr(struct platform_device *pdev,
> + struct miphy365x *phy,
> + struct device_node *child)
> +{
> + int index;
> + int ret;
>
> - phy->pcie = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> - if (!phy->pcie)
> - return -ENOMEM;
> + /* Each port handles SATA or PCIE. */
> + for (index = 0; index < 2; index++) {
> + ret = miphy365x_get_base_addr_one(pdev, phy,
> + child, index);
> + if (ret)
> + return ret;
> + }
>
> return 0;
> }
>
> -static int miphy365x_of_probe(struct device_node *np,
> +static int miphy365x_of_probe(struct platform_device *pdev,
> struct miphy365x_dev *phy_dev)
> {
> + struct device_node *np = pdev->dev.of_node;
> + struct device_node *child;
> + int child_count = 0;
> +
> + for_each_child_of_node(np, child)
> + child_count++;
use of_get_child_count() instead.
> +
> + if (child_count != ARRAY_SIZE(ports)) {
> + dev_err(&pdev->dev, "%d ports supported, %d supplied\n",
> + ARRAY_SIZE(ports), child_count);
> + return -EINVAL;
> + }
> +
> phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
> if (IS_ERR(phy_dev->regmap)) {
> dev_err(phy_dev->dev, "No syscfg phandle specified\n");
> @@ -556,11 +600,10 @@ static int miphy365x_of_probe(struct device_node *np,
>
> static int miphy365x_probe(struct platform_device *pdev)
> {
> - struct device_node *np = pdev->dev.of_node;
> + struct device_node *child, *np = pdev->dev.of_node;
> struct miphy365x_dev *phy_dev;
> struct device *dev = &pdev->dev;
> struct phy_provider *provider;
> - u8 port;
> int ret;
>
> if (!np) {
> @@ -572,7 +615,7 @@ static int miphy365x_probe(struct platform_device *pdev)
> if (!phy_dev)
> return -ENOMEM;
>
> - ret = miphy365x_of_probe(np, phy_dev);
> + ret = miphy365x_of_probe(pdev, phy_dev);
> if (ret)
> return ret;
>
> @@ -582,8 +625,9 @@ static int miphy365x_probe(struct platform_device *pdev)
>
> mutex_init(&phy_dev->miphy_mutex);
>
> - for (port = 0; port < ARRAY_SIZE(ports); port++) {
> + for_each_child_of_node(np, child) {
> struct phy *phy;
> + static int port = 0;
>
> phy = devm_phy_create(dev, &miphy365x_ops, NULL);
> if (IS_ERR(phy)) {
> @@ -591,15 +635,17 @@ static int miphy365x_probe(struct platform_device *pdev)
> return PTR_ERR(phy);
> }
>
> - phy_dev->phys[port].phy = phy;
> - phy_dev->phys[port].port = port;
> -
> - ret = miphy365x_get_base_addr(pdev,
> - &phy_dev->phys[port], port);
> + ret = miphy365x_get_base_addr(pdev, &phy_dev->phys[port],
> + child);
> if (ret)
> return ret;
>
> + phy_dev->phys[port].phy = phy;
> + phy_dev->phys[port].port = port;
> + phy_dev->phys[port].enabled = !!of_device_is_available(child);
> +
> phy_set_drvdata(phy, &phy_dev->phys[port]);
> + port++;
> }
>
> provider = devm_of_phy_provider_register(dev, miphy365x_xlate);
I think you can merge this to your original patch.
Cheers
Kishon
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