Commit 24d5c82f authored by Pantelis Antoniou's avatar Pantelis Antoniou Committed by Sebastian Andrzej Siewior
Browse files

mfd: ti_tscadc: deal with partial activation 



Fix the mfd device in the case where a subdevice might not be activated.

Signed-off-by: default avatarPantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
parent c80df483

drivers/mfd/ti_am335x_tscadc.c

+25 −13
Original line number Diff line number Diff line
@@ -107,11 +107,14 @@ static int ti_tscadc_probe(struct platform_device *pdev) 
	of_property_read_u32(node, "ti,adc-channels", &adc_channels);



	total_channels = tsc_wires + adc_channels;



	if (total_channels > 8) {

		dev_err(&pdev->dev, "Number of i/p channels more than 8\n");

		return -EINVAL;

	}

	if (total_channels == 0) {

		dev_err(&pdev->dev, "Need atleast one channel.\n");

		return -EINVAL;

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res) {
@@ -202,28 +205,37 @@ static int ti_tscadc_probe(struct platform_device *pdev) 
	ctrl |= CNTRLREG_TSCSSENB;

	tscadc_writel(tscadc, REG_CTRL, ctrl);



	tscadc->used_cells = 0;

	tscadc->tsc_cell = -1;

	tscadc->adc_cell = -1;



	/* TSC Cell */

	cell = &tscadc->cells[TSC_CELL];

	if (tsc_wires > 0) {

		tscadc->tsc_cell = tscadc->used_cells;

		cell = &tscadc->cells[tscadc->used_cells++];

		cell->name = "tsc";

		cell->of_compatible = "ti,am3359-tsc";

		cell->platform_data = &tscadc;

		cell->pdata_size = sizeof(tscadc);

	}



	/* ADC Cell */

	cell = &tscadc->cells[ADC_CELL];

	if (adc_channels > 0) {

		tscadc->adc_cell = tscadc->used_cells;

		cell = &tscadc->cells[tscadc->used_cells++];

		cell->name = "tiadc";

		cell->of_compatible = "ti,am3359-adc";

		cell->platform_data = &tscadc;

		cell->pdata_size = sizeof(tscadc);

	}



	err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,

			TSCADC_CELLS, NULL, 0, NULL);

			tscadc->used_cells, NULL, 0, NULL);

	if (err < 0)

		goto err_disable_clk;



	device_init_wakeup(&pdev->dev, true);

	platform_set_drvdata(pdev, tscadc);



	return 0;



err_disable_clk:

include/linux/mfd/ti_am335x_tscadc.h

+3 −5
Original line number Diff line number Diff line
@@ -120,11 +120,6 @@ 


#define TSCADC_CELLS		2



enum tscadc_cells {

	TSC_CELL,

	ADC_CELL,

};



struct mfd_tscadc_board {

	struct tsc_data *tsc_init;

	struct adc_data *adc_init;
@@ -135,6 +130,9 @@ struct ti_tscadc_dev { 
	struct regmap *regmap_tscadc;

	void __iomem *tscadc_base;

	int irq;

	int used_cells;	/* 1-2 */

	int tsc_cell;	/* -1 if not used */

	int adc_cell;	/* -1 if not used */

	struct mfd_cell cells[TSCADC_CELLS];

	u32 reg_se_cache;

	spinlock_t reg_lock;