Re: [PATCH 2/3] NFC: trf7970a: Add device tree option of 1.8 Volt IO voltage
From: Mark Greer <mgreer@animalcreek.com>
Date: 2016-12-21 02:23:51
Also in:
linux-wireless, lkml, netdev
On Tue, Dec 20, 2016 at 11:16:31AM -0500, Geoff Lansberry wrote:
From: Geoff Lansberry <redacted> The TRF7970A has configuration options for supporting hardware designs with 1.8 Volt or 3.3 Volt IO. This commit adds a device tree option, using a fixed regulator binding, for setting the io voltage to match the hardware configuration. If no option is supplied it defaults to 3.3 volt configuration.
Sign-off ?? Same comment for you other patches. <time passes> Okay I see you have it at the end of the patch. It should be here. 'git commit -s' is your friend.
quoted hunk ↗ jump to hunk
--- .../devicetree/bindings/net/nfc/trf7970a.txt | 4 ++-- drivers/nfc/trf7970a.c | 28 +++++++++++++++++++++- 2 files changed, 29 insertions(+), 3 deletions(-)diff --git a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt index e262ac1..b5777d8 100644 --- a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt +++ b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt@@ -21,9 +21,9 @@ Optional SoC Specific Properties: - t5t-rmb-extra-byte-quirk: Specify that the trf7970a has the erratum where an extra byte is returned by Read Multiple Block commands issued to Type 5 tags. +- vdd-io-supply: Regulator specifying voltage for vdd-io - clock-frequency: Set to specify that the input frequency to the trf7970a is 13560000Hz or 27120000Hz - Example (for ARM-based BeagleBone with TRF7970A on SPI1): &spi1 {@@ -41,11 +41,11 @@ Example (for ARM-based BeagleBone with TRF7970A on SPI1): <&gpio2 5 GPIO_ACTIVE_LOW>; vin-supply = <&ldo3_reg>; vin-voltage-override = <5000000>; + vdd-io-supply = <&ldo2_reg>; autosuspend-delay = <30000>; irq-status-read-quirk; en2-rf-quirk; t5t-rmb-extra-byte-quirk; - vdd_io_1v8;
It was already mentioned but this shouldn't have been added in the previous patch so it shouldn't be here now.
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clock-frequency = <27120000>; status = "okay"; };diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index 4e051e9..8a88195 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c
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@@ -2062,6 +2068,7 @@ static int trf7970a_probe(struct spi_device *spi) return ret; } +
Please don't add an extra blank line.
quoted hunk ↗ jump to hunk
of_property_read_u32(np, "clock-frequency", &clk_freq); if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) || (clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY)) {@@ -2105,6 +2112,25 @@ static int trf7970a_probe(struct spi_device *spi) if (uvolts > 4000000) trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; + trf->regulator = devm_regulator_get(&spi->dev, "vdd-io"); + if (IS_ERR(trf->regulator)) { + ret = PTR_ERR(trf->regulator); + dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret); + goto err_destroy_lock; + } + + ret = regulator_enable(trf->regulator); + if (ret) { + dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret); + goto err_destroy_lock; + } + +
Please don't add an extra blank line.
+ if (regulator_get_voltage(trf->regulator) == 1800000) {
+ trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW;
+ dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n");
+ }
+
trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops,
TRF7970A_SUPPORTED_PROTOCOLS,
NFC_DIGITAL_DRV_CAPS_IN_CRC |
--
Signed-off-by: Geoff Lansberry <redacted>Your 'Signed-off-by:' goes at the end of the commit description not here. Overall, I think you did the right thing (unless someone disagrees). Just some minor issues. Mark --