ARM: 7366/3: amba: Remove AMBA level regulator support
The AMBA bus regulator support is being used to model on/off switches for power domains which isn't terribly idiomatic for modern kernels with the generic power domain code and creates integration problems on platforms which don't use regulators for their power domains as it's hard to tell the difference between a regulator that is needed but failed to be provided and one that isn't supposed to be there (though DT does make that easier). Platforms that wish to use the regulator API to manage their power domains can indirect via the power domain interface. This feature is only used with the vape supply of the db8500 PRCMU driver which supplies the UARTs and MMC controllers, none of which have support for managing vcore at runtime in mainline (only pl022 SPI controller does). Update that supply to have an always_on constraint until the power domain support for the system is updated so that it is enabled for these users, this is likely to have no impact on practical systems as probably at least one of these devices will be active and cause AMBA to hold the supply on anyway. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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4 changed files with 2 additions and 50 deletions
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@ -247,8 +247,7 @@ static int amba_pm_restore(struct device *dev)
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/*
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* Hooks to provide runtime PM of the pclk (bus clock). It is safe to
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* enable/disable the bus clock at runtime PM suspend/resume as this
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* does not result in loss of context. However, disabling vcore power
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* would do, so we leave that to the driver.
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* does not result in loss of context.
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*/
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static int amba_pm_runtime_suspend(struct device *dev)
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{
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@ -354,39 +353,6 @@ static void amba_put_disable_pclk(struct amba_device *pcdev)
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clk_put(pclk);
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}
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static int amba_get_enable_vcore(struct amba_device *pcdev)
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{
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struct regulator *vcore = regulator_get(&pcdev->dev, "vcore");
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int ret;
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pcdev->vcore = vcore;
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if (IS_ERR(vcore)) {
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/* It is OK not to supply a vcore regulator */
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if (PTR_ERR(vcore) == -ENODEV)
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return 0;
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return PTR_ERR(vcore);
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}
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ret = regulator_enable(vcore);
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if (ret) {
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regulator_put(vcore);
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pcdev->vcore = ERR_PTR(-ENODEV);
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}
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return ret;
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}
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static void amba_put_disable_vcore(struct amba_device *pcdev)
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{
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struct regulator *vcore = pcdev->vcore;
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if (!IS_ERR(vcore)) {
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regulator_disable(vcore);
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regulator_put(vcore);
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}
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}
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/*
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* These are the device model conversion veneers; they convert the
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* device model structures to our more specific structures.
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@ -399,10 +365,6 @@ static int amba_probe(struct device *dev)
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int ret;
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do {
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ret = amba_get_enable_vcore(pcdev);
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if (ret)
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break;
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ret = amba_get_enable_pclk(pcdev);
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if (ret)
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break;
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@ -420,7 +382,6 @@ static int amba_probe(struct device *dev)
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pm_runtime_put_noidle(dev);
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amba_put_disable_pclk(pcdev);
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amba_put_disable_vcore(pcdev);
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} while (0);
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return ret;
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@ -442,7 +403,6 @@ static int amba_remove(struct device *dev)
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pm_runtime_put_noidle(dev);
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amba_put_disable_pclk(pcdev);
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amba_put_disable_vcore(pcdev);
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return ret;
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}
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@ -2788,6 +2788,7 @@ static struct regulator_init_data db8500_regulators[DB8500_NUM_REGULATORS] = {
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.constraints = {
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.name = "db8500-vape",
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.valid_ops_mask = REGULATOR_CHANGE_STATUS,
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.always_on = true,
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},
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.consumer_supplies = db8500_vape_consumers,
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.num_consumer_supplies = ARRAY_SIZE(db8500_vape_consumers),
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@ -2195,7 +2195,6 @@ static int pl022_runtime_suspend(struct device *dev)
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struct pl022 *pl022 = dev_get_drvdata(dev);
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clk_disable(pl022->clk);
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amba_vcore_disable(pl022->adev);
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return 0;
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}
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@ -2204,7 +2203,6 @@ static int pl022_runtime_resume(struct device *dev)
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{
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struct pl022 *pl022 = dev_get_drvdata(dev);
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amba_vcore_enable(pl022->adev);
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clk_enable(pl022->clk);
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return 0;
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@ -30,7 +30,6 @@ struct amba_device {
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struct device dev;
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struct resource res;
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struct clk *pclk;
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struct regulator *vcore;
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u64 dma_mask;
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unsigned int periphid;
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unsigned int irq[AMBA_NR_IRQS];
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@ -75,12 +74,6 @@ void amba_release_regions(struct amba_device *);
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#define amba_pclk_disable(d) \
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do { if (!IS_ERR((d)->pclk)) clk_disable((d)->pclk); } while (0)
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#define amba_vcore_enable(d) \
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(IS_ERR((d)->vcore) ? 0 : regulator_enable((d)->vcore))
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#define amba_vcore_disable(d) \
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do { if (!IS_ERR((d)->vcore)) regulator_disable((d)->vcore); } while (0)
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/* Some drivers don't use the struct amba_device */
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#define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
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#define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
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