| Message ID | 20210915155908.476767-36-miquel.raynal@bootlin.com |
|---|---|
| State | New |
| Headers | show |
| Series | TI AM437X ADC1 | expand |
Hi Lee, lee.jones@linaro.org wrote on Wed, 22 Sep 2021 17:00:20 +0100: > On Wed, 15 Sep 2021, Miquel Raynal wrote: > > > Introduce a new compatible that has another set of driver data, > > targeting am437x SoCs with a magnetic reader instead of the > > touchscreen and a more featureful set of registers. > > > > Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> > > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > > --- > > drivers/mfd/ti_am335x_tscadc.c | 41 ++++++++++++++++++++++++---- > > include/linux/mfd/ti_am335x_tscadc.h | 7 +++++ > > 2 files changed, 42 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c > > index 65c0fa735a71..155a8ed879b3 100644 > > --- a/drivers/mfd/ti_am335x_tscadc.c > > +++ b/drivers/mfd/ti_am335x_tscadc.c > > @@ -121,11 +121,11 @@ static int ti_tscadc_probe(struct platform_device *pdev) > > struct mfd_cell *cell; > > struct property *prop; > > const __be32 *cur; > > - bool use_tsc = false; > > + bool use_tsc = false, use_mag = false; > > u32 val; > > int err; > > int tscmag_wires = 0, adc_channels = 0, cell_idx = 0, total_channels; > > - int readouts = 0; > > + int readouts = 0, mag_tracks = 0; > > > > /* Allocate memory for device */ > > tscadc = devm_kzalloc(&pdev->dev, sizeof(*tscadc), GFP_KERNEL); > > @@ -148,6 +148,16 @@ static int ti_tscadc_probe(struct platform_device *pdev) > > of_node_put(node); > > if (tscmag_wires) > > use_tsc = true; > > + } else { > > + /* > > + * When adding support for the magnetic reader, here is the > > + * place to look for the number of tracks used from device tree. > > + * Let's default to 0 for now. > > + */ > > + mag_tracks = 0; > > + tscmag_wires = mag_tracks * 2; > > + if (tscmag_wires) > > + use_mag = true; > > } > > > > node = of_get_child_by_name(pdev->dev.of_node, "adc"); > > @@ -209,8 +219,9 @@ static int ti_tscadc_probe(struct platform_device *pdev) > > * The TSC_ADC_Subsystem has 2 clock domains: OCP_CLK and ADC_CLK. > > * ADCs produce a 12-bit sample every 15 ADC_CLK cycles. > > * am33xx ADCs expect to capture 200ksps. > > - * We need the ADC clocks to run at 3MHz. > > - * This frequency is valid since TSC_ADC_SS controller design > > + * am47xx ADCs expect to capture 867ksps. > > + * We need ADC clocks respectively running at 3MHz and 13MHz. > > + * These frequencies are valid since TSC_ADC_SS controller design > > * assumes the OCP clock is at least 6x faster than the ADC clock. > > */ > > clk = devm_clk_get(&pdev->dev, NULL); > > @@ -238,6 +249,9 @@ static int ti_tscadc_probe(struct platform_device *pdev) > > else > > tscadc->ctrl |= CNTRLREG_TSC_4WIRE; > > } > > + } else { > > + tscadc->ctrl |= CNTRLREG_MAG_PREAMP_PWRDOWN | > > + CNTRLREG_MAG_PREAMP_BYPASS; > > } > > regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl); > > > > @@ -246,7 +260,7 @@ static int ti_tscadc_probe(struct platform_device *pdev) > > /* Enable the TSC module enable bit */ > > regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl | CNTRLREG_SSENB); > > > > - /* TSC Cell */ > > + /* TSC or MAG Cell */ > > if (tscmag_wires > 0) { > > cell = &tscadc->cells[cell_idx++]; > > cell->name = tscadc->data->name_tscmag; > > @@ -334,6 +348,7 @@ static SIMPLE_DEV_PM_OPS(tscadc_pm_ops, tscadc_suspend, tscadc_resume); > > > > static const struct ti_tscadc_data tscdata = { > > .has_tsc = true, > > + .has_mag = false, > > .name_tscmag = "TI-am335x-tsc", > > .compat_tscmag = "ti,am3359-tsc", > > .name_adc = "TI-am335x-adc", > > @@ -341,11 +356,25 @@ static const struct ti_tscadc_data tscdata = { > > .target_clk_rate = TSC_ADC_CLK, > > }; > > > > +static const struct ti_tscadc_data magdata = { > > + .has_tsc = false, > > + .has_mag = true, > > Why 2 bools? > > Better to have a single u8: > > MODE_TOUCHSCREEN > MODE_MAG_STRING > MODE_NONE It's not a mode like "please use this feature", it is more like a feature that is present and we need to know which one it is. Anyway, I can use an enum for this, fine. > > > + .name_tscmag = "TI-am43xx-mag", > > + .compat_tscmag = "ti,am4372-mag", > > + .name_adc = "TI-am43xx-adc", > > + .compat_adc = "ti,am4372-adc", > > + .target_clk_rate = MAG_ADC_CLK, > > +}; > > + > > static const struct of_device_id ti_tscadc_dt_ids[] = { > > { > > .compatible = "ti,am3359-tscadc", > > .data = &tscdata, > > }, > > + { > > + .compatible = "ti,am4372-magadc", > > + .data = &magdata, > > + }, > > { } > > }; > > MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids); > > @@ -363,6 +392,6 @@ static struct platform_driver ti_tscadc_driver = { > > > > module_platform_driver(ti_tscadc_driver); > > > > -MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver"); > > +MODULE_DESCRIPTION("TI touchscreen/magnetic reader/ADC MFD controller driver"); > > Magnetic what? Tape, disk, stripe? I guess my current knowledge of English tricked me as I thought "magnetic reader" was clear enough for everybody, but I'll make the commit logs and this module description clearer by specifying the "stripe" keyword, sure. > > > MODULE_AUTHOR("Rachna Patil <rachna@ti.com>"); > > MODULE_LICENSE("GPL"); > > diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h > > index 467b3bec4335..9a412e6d764b 100644 > > --- a/include/linux/mfd/ti_am335x_tscadc.h > > +++ b/include/linux/mfd/ti_am335x_tscadc.h > > @@ -106,6 +106,11 @@ > > #define CNTRLREG_TSC_8WIRE CNTRLREG_TSC_AFE_CTRL(3) > > #define CNTRLREG_TSC_ENB BIT(7) > > > > +/*Control registers bitfields for MAGADC IP */ > > +#define CNTRLREG_MAGADCENB BIT(0) > > +#define CNTRLREG_MAG_PREAMP_PWRDOWN BIT(5) > > +#define CNTRLREG_MAG_PREAMP_BYPASS BIT(6) > > + > > /* FIFO READ Register */ > > #define FIFOREAD_DATA_MASK GENMASK(11, 0) > > #define FIFOREAD_CHNLID_MASK GENMASK(19, 16) > > @@ -119,6 +124,7 @@ > > #define CHARGE_STEP 0x11 > > > > #define TSC_ADC_CLK (3 * HZ_PER_MHZ) > > +#define MAG_ADC_CLK (13 * HZ_PER_MHZ) > > #define TOTAL_STEPS 16 > > #define TOTAL_CHANNELS 8 > > #define FIFO1_THRESHOLD 19 > > @@ -141,6 +147,7 @@ > > > > struct ti_tscadc_data { > > bool has_tsc; > > + bool has_mag; > > char *name_tscmag; > > char *compat_tscmag; > > char *name_adc; > Thanks, Miquèl
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index 65c0fa735a71..155a8ed879b3 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -121,11 +121,11 @@ static int ti_tscadc_probe(struct platform_device *pdev) struct mfd_cell *cell; struct property *prop; const __be32 *cur; - bool use_tsc = false; + bool use_tsc = false, use_mag = false; u32 val; int err; int tscmag_wires = 0, adc_channels = 0, cell_idx = 0, total_channels; - int readouts = 0; + int readouts = 0, mag_tracks = 0; /* Allocate memory for device */ tscadc = devm_kzalloc(&pdev->dev, sizeof(*tscadc), GFP_KERNEL); @@ -148,6 +148,16 @@ static int ti_tscadc_probe(struct platform_device *pdev) of_node_put(node); if (tscmag_wires) use_tsc = true; + } else { + /* + * When adding support for the magnetic reader, here is the + * place to look for the number of tracks used from device tree. + * Let's default to 0 for now. + */ + mag_tracks = 0; + tscmag_wires = mag_tracks * 2; + if (tscmag_wires) + use_mag = true; } node = of_get_child_by_name(pdev->dev.of_node, "adc"); @@ -209,8 +219,9 @@ static int ti_tscadc_probe(struct platform_device *pdev) * The TSC_ADC_Subsystem has 2 clock domains: OCP_CLK and ADC_CLK. * ADCs produce a 12-bit sample every 15 ADC_CLK cycles. * am33xx ADCs expect to capture 200ksps. - * We need the ADC clocks to run at 3MHz. - * This frequency is valid since TSC_ADC_SS controller design + * am47xx ADCs expect to capture 867ksps. + * We need ADC clocks respectively running at 3MHz and 13MHz. + * These frequencies are valid since TSC_ADC_SS controller design * assumes the OCP clock is at least 6x faster than the ADC clock. */ clk = devm_clk_get(&pdev->dev, NULL); @@ -238,6 +249,9 @@ static int ti_tscadc_probe(struct platform_device *pdev) else tscadc->ctrl |= CNTRLREG_TSC_4WIRE; } + } else { + tscadc->ctrl |= CNTRLREG_MAG_PREAMP_PWRDOWN | + CNTRLREG_MAG_PREAMP_BYPASS; } regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl); @@ -246,7 +260,7 @@ static int ti_tscadc_probe(struct platform_device *pdev) /* Enable the TSC module enable bit */ regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl | CNTRLREG_SSENB); - /* TSC Cell */ + /* TSC or MAG Cell */ if (tscmag_wires > 0) { cell = &tscadc->cells[cell_idx++]; cell->name = tscadc->data->name_tscmag; @@ -334,6 +348,7 @@ static SIMPLE_DEV_PM_OPS(tscadc_pm_ops, tscadc_suspend, tscadc_resume); static const struct ti_tscadc_data tscdata = { .has_tsc = true, + .has_mag = false, .name_tscmag = "TI-am335x-tsc", .compat_tscmag = "ti,am3359-tsc", .name_adc = "TI-am335x-adc", @@ -341,11 +356,25 @@ static const struct ti_tscadc_data tscdata = { .target_clk_rate = TSC_ADC_CLK, }; +static const struct ti_tscadc_data magdata = { + .has_tsc = false, + .has_mag = true, + .name_tscmag = "TI-am43xx-mag", + .compat_tscmag = "ti,am4372-mag", + .name_adc = "TI-am43xx-adc", + .compat_adc = "ti,am4372-adc", + .target_clk_rate = MAG_ADC_CLK, +}; + static const struct of_device_id ti_tscadc_dt_ids[] = { { .compatible = "ti,am3359-tscadc", .data = &tscdata, }, + { + .compatible = "ti,am4372-magadc", + .data = &magdata, + }, { } }; MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids); @@ -363,6 +392,6 @@ static struct platform_driver ti_tscadc_driver = { module_platform_driver(ti_tscadc_driver); -MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver"); +MODULE_DESCRIPTION("TI touchscreen/magnetic reader/ADC MFD controller driver"); MODULE_AUTHOR("Rachna Patil <rachna@ti.com>"); MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h index 467b3bec4335..9a412e6d764b 100644 --- a/include/linux/mfd/ti_am335x_tscadc.h +++ b/include/linux/mfd/ti_am335x_tscadc.h @@ -106,6 +106,11 @@ #define CNTRLREG_TSC_8WIRE CNTRLREG_TSC_AFE_CTRL(3) #define CNTRLREG_TSC_ENB BIT(7) +/*Control registers bitfields for MAGADC IP */ +#define CNTRLREG_MAGADCENB BIT(0) +#define CNTRLREG_MAG_PREAMP_PWRDOWN BIT(5) +#define CNTRLREG_MAG_PREAMP_BYPASS BIT(6) + /* FIFO READ Register */ #define FIFOREAD_DATA_MASK GENMASK(11, 0) #define FIFOREAD_CHNLID_MASK GENMASK(19, 16) @@ -119,6 +124,7 @@ #define CHARGE_STEP 0x11 #define TSC_ADC_CLK (3 * HZ_PER_MHZ) +#define MAG_ADC_CLK (13 * HZ_PER_MHZ) #define TOTAL_STEPS 16 #define TOTAL_CHANNELS 8 #define FIFO1_THRESHOLD 19 @@ -141,6 +147,7 @@ struct ti_tscadc_data { bool has_tsc; + bool has_mag; char *name_tscmag; char *compat_tscmag; char *name_adc;